Total biomass and production of the ocean population. The world's oceans as a habitat for life The exact ratio of biomass in the ocean
"Relationships in nature" - For example, squirrels and moose do not have significant effects on each other. Intraspecific. Squirrel monkeys. Examples of interspecific competition. Amensalism. The oxygen content in the atmosphere has risen from 1% to 21% over the past billion years. There are no non-interacting populations and species in nature. Types of competition: Evolution and ecology. Competition. Spider monkeys. For example, the relationship between spruce and plants of the lower tier.
"Ecological relations" - The predominance of external energy supply. characteristics of a living organism. Genotype. unitary organisms. Diversity of organisms. Classification of organisms in relation to water. Life forms according to Raunkjer. The main characteristics of the external environment. Moisture. Phenotype. water anomalies. Light. modular organisms. Molecular genetic level. Life forms of plants. mutation process. Organism.
"Circulation of substances and energy" - Most of the energy contained in food is released. The main producer is phytoplankton. Growth per unit of time. Producers (first level) have a 50% increase in biomass. Decomposition chain. The biomass of each subsequent level increases. Ecosystem productivity. The flow of energy and the circulation of substances in ecosystems. Rule (law) 10% R. Lindeman. Chemical elements move through food chains.
The world ocean is an ecological system, a single functional set of organisms and their habitat. The oceanic ecosystem has physical and chemical features that provide certain advantages for living organisms to live in it.
The constant marine circulation leads to intense mixing of ocean waters, with the result that oxygen deficiency is relatively rare in the ocean depths.
An important factor in the existence and distribution of life in the thickness of the World Ocean is the amount of penetrating light, according to which the ocean is divided into two horizontal zones: euphotic ( usually up to 100-200 m) and aphotic(extends to the very bottom). The euphotic zone is a zone of primary production, it is characterized by the arrival of a large amount of sunlight and, as a result, favorable conditions for the development of the primary energy source in marine food chains - microplankton, which includes the smallest green algae and bacteria. The most productive part of the euphotic zone is the area of the continental shelf (in general, it coincides with the sublittoral zone). The high abundance of zooplankton and phytoplankton in this area, combined with a high content of nutrients washed from land by rivers and temporary streams, as well as in some places the rise of cold, oxygen-rich deep waters (upwelling zones), has led to the fact that almost all large commercial fisheries are concentrated on the continental shelf.
The euphotic zone is less productive, mainly due to the fact that less sunlight enters here, and the conditions for the development of the first link of food chains in the ocean are extremely limited.
Another important factor determining the existence and distribution of life in the World Ocean is the concentration of biogenic elements in water (especially phosphorus and nitrogen, which are most actively absorbed by unicellular algae) and dissolved oxygen. Nutrients enter the water mainly with river runoff and reach a maximum concentration at a depth of 800-1000 m, but the main consumption of nutrients by phytoplankton is concentrated in the surface layer 100-200 m thick. Here, photosynthetic algae release oxygen, which is carried away into the the depths of the ocean, creating conditions for the existence of life there. Thus, at a depth (100-200 m) with a sufficient amount of biogenic elements contained and a sufficient concentration of dissolved oxygen, conditions are created for the existence of plant organisms (phytoplankton), which determine the reproduction and spread of zooplankton, fish and other animals.
In the World Ocean, the main step in the biomass pyramid - unicellular algae divide at a high rate and give a very high production. This explains why animal biomass is two dozen times larger than plant biomass. The total biomass of the World Ocean is approximately 35 billion tons. At the same time, animals account for 32.5 billion tons, and algae - 1.7 billion tons. However, the total number of algae changes little, because they are quickly eaten by zooplankton and various filter feeders (for example, whales). Fish, cephalopods, large crustaceans grow and reproduce more slowly, but are eaten even more slowly by enemies, so their biomass has time to accumulate. Biomass pyramid in the ocean it turns out, thus, inverted. In terrestrial ecosystems, the rate of consumption of plant growth is lower and the biomass pyramid in most cases resembles a production pyramid.
Rice. four.
The production of zooplankton is 10 times less than that of unicellular algae. The production of fish and other representatives of nekton is 3000 times less than that of plankton, which provides extremely favorable conditions for their development.
The high productivity of bacteria and algae ensures the processing of the remains of the vital activity of a large biomass of the ocean, which, in combination with the vertical mixing of the waters of the World Ocean, contributes to the decomposition of these residues, thereby forming and maintaining the oxidizing properties of the aquatic environment, which create exceptionally favorable conditions for the development of life throughout the entire thickness of the World Ocean. ocean. Only in certain regions of the World Ocean, as a result of a particularly sharp stratification of waters in the deep layers, a reducing environment is formed.
Living conditions in the ocean are highly constancy, which is why the inhabitants of the ocean do not need specialized covers and adaptations that are so necessary for living organisms on land, where abrupt and intense changes in environmental factors are not uncommon.
The high density of seawater provides physical support to marine organisms, resulting in organisms with large body masses (cetaceans) retaining excellent buoyancy.
All organisms that live in the ocean are divided into three (largest) ecological groups (based on lifestyle and habitat): plankton, nekton and benthos. Plankton- a set of organisms that are not capable of independent movement, which are carried by waters and currents. Plankton has the highest biomass and the highest species diversity. The composition of plankton includes zooplankton (animal plankton), which inhabits the entire thickness of the ocean, and phytoplankton (plant plankton), which lives only in the surface layer of water (up to a depth of 100-150 m). Phytoplankton, mainly the smallest unicellular algae, is the food for zooplankton. Nekton- animals capable of independent movement in the water column over long distances. Nekton includes cetaceans, pinnipeds, fish, sirenidae, sea snakes and sea turtles. The total biomass of nekton is approximately 1 billion tons, half of this amount is accounted for by fish. Benthos- a set of organisms that live on the ocean floor or in bottom sediments. Animal benthos is all types of invertebrates (mussels, oysters, crabs, lobsters, spiny lobsters); plant benthos is represented mainly by various algae.
The total biological mass of the World Ocean (the total mass of all organisms living in the ocean) is 35-40 billion tons. It is much less than the biological mass of land (2420 billion tons), despite the fact that the ocean is large. This is explained by the fact that most of the ocean area is almost lifeless water spaces, and only the periphery of the ocean and upwelling zones are characterized by the highest biological productivity. In addition, on land, phytomass exceeds zoomass by 2000 times, and in the World Ocean, animal biomass is 18 times greater than plant biomass.
Living organisms in the World Ocean are distributed unevenly, since a number of factors influence their formation and species diversity. As mentioned above, the distribution of living organisms largely depends on the distribution of temperature and salinity in the ocean across latitudes. Thus, warmer waters are characterized by higher biodiversity (400 species of living organisms live in the Laptev Sea, and 7000 species in the Mediterranean), and salinity with indicators from 5 to 8 ppm is the limit for the distribution of most marine animals in the ocean. Transparency allows the penetration of favorable sunlight only to a depth of 100-200 m, as a result, this area of \u200b\u200bthe ocean (sublittoral) is characterized by the presence of light, a large abundance of food, active mixing of water masses - all this determines the creation of the most favorable conditions for the development and existence of life in this area ocean (90% of all fish wealth lives in the upper layers of the ocean to a depth of 500 m). During the year, natural conditions in different regions of the World Ocean change markedly. Many living organisms have adapted to this, having learned to make vertical and horizontal movements (migrations) over long distances in the water column. At the same time, planktonic organisms are capable of passive migration (with the help of currents), while fish and mammals are capable of active (independent) migration during periods of feeding and reproduction.
The area of the World Ocean (Earth's hydrosphere) occupies 72.2% of the entire surface of the Earth
Water has special properties that are important for the life of organisms - high heat capacity and thermal conductivity, relatively uniform temperature, significant density, viscosity and mobility, the ability to dissolve chemicals (about 60 elements) and gases (O 2, CO 2) transparency, surface tension, salinity, pH of the environment, etc. (the chemical composition and physical properties of ocean waters are relatively constant and create favorable conditions for the development of various life forms)
· Animals predominate in the biomass of organisms in the World Ocean (94%); plants, respectively - 6%; the biomass of the World Ocean is 1000 times less than on land (aquatic autotrophs have a large P \ B value, since they have a huge rate of generation - reproduction - producers)
Ocean plants account for up to 25% of the primary production of photosynthesis on the entire planet (light penetrates to a depth of 100-200 m; the ocean surface in this thickness is completely filled with microscopic algae - green, diatoms, brown, red, blue-green - the main producers of the ocean ) ; many algae are huge: green - up to 50 - 100 m; brown (fucus, kelp) - up to 100-150 m; red (porphyry, corraline) - up to 200 m; brown alga macrocystis - up to 300 m
The biomass and species diversity of the ocean naturally decreases with depth, which is associated with a deterioration in the physical conditions of existence, primarily for plants (a decrease in the amount of light, a decrease in temperature, the amount of O 2 and CO 2)
There is a vertical zonality of the distribution of living organisms
q Three ecological areas are distinguished: coastal zone – littoral, water column - pelagial and the bottom benthal; the coastal part of the ocean to a depth of 200 - 500 m is continental shelf (shelf); it is here that the living conditions are optimal for marine organisms, therefore the maximum species diversity of fauna and flora is observed here, 80% of all biological production of the ocean is concentrated here
Along with vertical zonality, regular horizontal changes in the species diversity of marine organisms are also observed, for example, the diversity of algae species increases from the poles to the equator
Condensations of organisms are observed in the ocean: planktonic, coastal, bottom, colonies of corals forming reefs
Single-celled algae and tiny animals suspended in water form plankton(autotrophic phytoplankton and heterotrophic zooplankton), attached and sessile inhabitants of the bottom are called benthos(corals, algae, sponges, bryozoans, ascidians, polychaete rings, crustaceans, mollusks, echinoderms; flounder, rays swim at the bottom)
In the water mass, organisms can move either actively - nekton(fish, cetaceans, seals, sea turtles, sea snakes, clams, squids, octopuses, jellyfish) , or passively plankton, which is of major importance in the nutrition of ocean animals)
v Playston - a collection of organisms floating on the surface of the water (some jellyfish)
v Neuston - organisms that attach to the surface film of water from above and below (single-celled animals)
v Hyponeuston - organisms living directly under the surface of the water (mullet larvae, anchovy, copepods, sargasso boat, etc.)
The maximum biomass of the ocean is observed on the continental shelf, near the coast, islands on coral reefs, in areas of rising deep cold waters rich in accumulated biogenic elements
· Bental is characterized by complete darkness, huge pressure, low temperature, lack of food resources, low O 2 content; this causes peculiar adaptations of deep-sea organisms (glow, lack of vision, development of adipose tissue in the swim bladder, etc.)
· Bacteria that mineralize organic residues (detritus) are common throughout the water column and especially at the bottom; organic detritus contains a huge supply of food that is consumed by the inhabitants of the bottom: worms, molluscs, sponges, bacteria, protists
Dead organisms settle to the bottom of the ocean, forming sedimentary rocks (many of them are covered with siliceous or calcareous shells, from which limestones and chalk are subsequently formed)
End of work -
This topic belongs to:
Essence of life
Living matter qualitatively differs from non-living matter by its enormous complexity and high structural and functional orderliness. Living and non-living matter are similar at the elementary chemical level, i.e. Chemical compounds of cell matter..
If you need additional material on this topic, or you did not find what you were looking for, we recommend using the search in our database of works:
What will we do with the received material:
If this material turned out to be useful for you, you can save it to your page on social networks:
| tweet |
All topics in this section:
Mutation process and reserve of hereditary variability
In the gene pool of populations, a continuous mutation process occurs under the influence of mutagenic factors Recessive alleles mutate more often (encode less resistant to the action of mutagenic fa
Allele and genotype frequencies (population genetic structure)
The genetic structure of a population is the ratio of the frequencies of alleles (A and a) and genotypes (AA, Aa, aa) in the gene pool of the population Allele frequency
Cytoplasmic inheritance
There are data that are inexplicable from the point of view of the chromosome theory of heredity by A. Weisman and T. Morgan (i.e., exclusively nuclear localization of genes) The cytoplasm is involved in re
Plasmogenes of mitochondria
One myotochondria contains 4-5 circular DNA molecules about 15,000 base pairs long Contains genes for: - synthesis of t RNA, p RNA and ribosome proteins, some aero enzymes
Plasmids
Plasmids are very short, autonomously replicating circular fragments of the bacterial DNA molecule that provide non-chromosomal transmission of hereditary information.
Variability
Variability is a common property of all organisms to acquire structural and functional differences from their ancestors.
Mutational variability
Mutations - qualitative or quantitative DNA of body cells, leading to changes in their genetic apparatus (genotype) Mutation theory of creation
Causes of Mutations
Mutagenic factors (mutagens) - substances and influences capable of inducing a mutational effect (any factors of the external and internal environment that can
Mutation frequency
· The frequency of mutation of individual genes varies widely and depends on the state of the organism and the stage of ontogeny (usually increases with age). On average, each gene mutates once every 40,000 years.
Gene mutations (point, true)
The reason is a change in the chemical structure of the gene (violation of the nucleotide sequence in DNA: * gene inserts of a pair or several nucleotides
Chromosomal mutations (chromosomal rearrangements, aberrations)
Causes - are caused by significant changes in the structure of chromosomes (redistribution of the hereditary material of chromosomes) In all cases, they arise as a result of ra
polyploidy
Polyploidy - a multiple increase in the number of chromosomes in a cell (the haploid set of chromosomes -n is repeated not 2 times, but many times - up to 10 -1
The meaning of polyploidy
1. Polyploidy in plants is characterized by an increase in the size of cells, vegetative and generative organs - leaves, stems, flowers, fruits, root crops, etc. , y
Aneuploidy (heteroploidy)
Aneuploidy (heteroploidy) - a change in the number of individual chromosomes that is not a multiple of the haploid set (in this case, one or more chromosomes from a homologous pair are normal
Somatic mutations
Somatic mutations - mutations that occur in the somatic cells of the body Distinguish between gene, chromosomal and genomic somatic mutations
The law of homologous series in hereditary variability
· Discovered by N. I. Vavilov on the basis of the study of wild and cultivated flora of five continents 5. The mutation process in genetically related species and genera proceeds in parallel, in
Combination variability
Combinative variability - variability resulting from the regular recombination of alleles in the genotypes of offspring, due to sexual reproduction
Phenotypic variability (modification or non-hereditary)
Modification variability - evolutionarily fixed adaptive reactions of an organism to a change in the external environment without changing the genotype
The value of modification variability
1. most modifications have an adaptive value and contribute to the adaptation of the body to a change in the external environment 2. can cause negative changes - morphoses
Statistical patterns of modification variability
· Modifications of a single trait or property, measured quantitatively, form a continuous series (variation series); it cannot be built according to an unmeasurable feature or a feature that exists
Variation curve of the distribution of modifications in the variation series
V - trait variants P - frequency of occurrence of trait variants Mo - mode, or most
Differences in the manifestation of mutations and modifications
Mutational (genotypic) variability Modification (phenotypic) variability 1. Associated with changes in the geno- and karyotype
Features of a person as an object of genetic research
1. It is impossible to purposefully select parental pairs and experimental marriages (impossibility of experimental crossing) 2. Slow generational change, which occurs on average after
Methods for studying human genetics
Genealogical method · The method is based on the compilation and analysis of genealogies (introduced into science at the end of the 19th century by F. Galton); the essence of the method is to trace us
twin method
The method consists in studying the patterns of inheritance of traits in single and dizygotic twins (the frequency of birth of twins is one case per 84 newborns)
Cytogenetic method
Consists of a visual study of mitotic metaphase chromosomes under a microscope Based on the method of differential staining of chromosomes (T. Kasperson,
Dermatoglyphics method
Based on the study of the relief of the skin on the fingers, palms and plantar surfaces of the feet (there are epidermal protrusions - ridges that form complex patterns), this trait is inherited
Population-statistical method
Based on the statistical (mathematical) processing of data on inheritance in large population groups (populations - groups that differ in nationality, religion, race, profession)
Somatic cell hybridization method
Based on the reproduction of somatic cells of organs and tissues outside the body in sterile nutrient media (cells are most often obtained from the skin, bone marrow, blood, embryos, tumors) and
Modeling method
· The theoretical basis of biological modeling in genetics is given by the law of homological series of hereditary variability by N.I. Vavilova For modeling, certain
Genetics and medicine (medical genetics)
Studying the causes, diagnostic signs, possibilities of rehabilitation and prevention of human hereditary diseases (monitoring of genetic abnormalities)
Chromosomal diseases
The reason is a change in the number (genomic mutations) or structure of chromosomes (chromosomal mutations) of the karyotype of the germ cells of the parents (anomalies can occur at different
Polysomy on sex chromosomes
Trisomy - X (Triplo X syndrome); Karyotype (47, XXX) Known in women; syndrome frequency 1: 700 (0.1%) N
Hereditary diseases of gene mutations
Cause - gene (point) mutations (changes in the nucleotide composition of a gene - insertions, substitutions, dropouts, transfers of one or more nucleotides; the exact number of genes in a person is unknown
Diseases controlled by genes located on the X or Y chromosome
Hemophilia - blood incoagulability Hypophosphatemia - loss of phosphorus and lack of calcium by the body, softening of the bones Muscular dystrophy - structural disorders
Genotypic level of prevention
1. Search and application of antimutagenic protective substances Antimutagens (protectors) are compounds that neutralize a mutagen before it reacts with a DNA molecule or remove it
Treatment of hereditary diseases
1. Symptomatic and pathogenetic - impact on the symptoms of the disease (the genetic defect is preserved and transmitted to offspring) n dieter
Gene Interaction
Heredity - a set of genetic mechanisms that ensure the preservation and transmission of the structural and functional organization of a species in a number of generations from ancestors
Interaction of allelic genes (one allelic pair)
There are five types of allelic interactions: 1. Complete dominance 2. Incomplete dominance 3. Overdominance 4. Codominance
complementarity
Complementarity - the phenomenon of the interaction of several non-allelic dominant genes, leading to the emergence of a new trait that is absent in both parents
Polymerism
Polymeria - the interaction of non-allelic genes, in which the development of one trait occurs only under the action of several non-allelic dominant genes (polygene
Pleiotropy (multiple gene action)
Pleiotropy - the phenomenon of the influence of one gene on the development of several traits The reason for the pleiotropic influence of a gene is in the action of the primary product of this
Selection basics
Selection (lat. selektio - selection) - science and industry of agricultural. production, developing the theory and methods of creating new and improving existing plant varieties, animal breeds
Domestication as the first stage of selection
Cultivated plants and domestic animals are descended from wild ancestors; this process is called domestication or domestication The driving force behind domestication is the suit
Centers of origin and diversity of cultivated plants (according to N. I. Vavilov)
Center name Geographical location Homeland of cultivated plants
Artificial selection (selection of parent pairs)
Two types of artificial selection are known: mass and individual
Hybridization (crossing)
Allows you to combine certain hereditary traits in one organism, as well as get rid of undesirable properties In breeding, various crossing systems are used &n
Inbreeding (inbreeding)
Inbreeding is the crossing of individuals with a close degree of kinship: brother - sister, parents - offspring (in plants, the closest form of inbreeding occurs when self-breeding
Outbreeding (outbreeding)
When crossing unrelated individuals, harmful recessive mutations that are in the homozygous state become heterozygous and do not adversely affect the viability of the organism
heterosis
Heterosis (hybrid strength) is a phenomenon of a sharp increase in the viability and productivity of first-generation hybrids during unrelated crossing (interbreeding).
Induced (artificial) mutagenesis
The frequency with the spectrum of mutations increases dramatically when exposed to mutagens (ionizing radiation, chemicals, extreme environmental conditions, etc.)
Interline hybridization in plants
It consists in crossing pure (inbred) lines obtained as a result of long-term forced self-pollination of cross-pollinated plants in order to obtain maximum
Vegetative propagation of somatic mutations in plants
The method is based on the isolation and selection of useful somatic mutations for economic traits in the best old varieties (possible only in plant breeding)
Methods of breeding and genetic work by I. V. Michurina
1. Systematically distant hybridization
polyploidy
Polyploidy - the phenomenon of a multiple of the main number (n) of an increase in the number of chromosomes in the somatic cells of the body (the mechanism for the formation of polyploids and
Cell engineering
Cultivation of individual cells or tissues on artificial sterile nutrient media containing amino acids, hormones, mineral salts and other nutritional components (
Chromosomal engineering
The method is based on the possibility of replacing or adding new individual chromosomes in plants It is possible to decrease or increase the number of chromosomes in any homologous pair - aneuploidy
Animal breeding
Has a number of features in comparison with plant breeding, which objectively make it difficult to carry out 1. Only sexual reproduction is characteristic (lack of vegetative
domestication
It began about 10 - 5 thousand years ago in the Neolithic era (it weakened the effect of stabilizing natural selection, which led to an increase in hereditary variability and an increase in the selection efficiency
Crossing (hybridization)
There are two methods of crossing: related (inbreeding) and unrelated (outbreeding) When selecting a pair, the pedigrees of each manufacturer are taken into account (stud books, learn
Outbreeding (outbreeding)
Can be intrabreeding and interbreeding, interspecific or intergeneric (systematically distant hybridization) Accompanied by the effect of heterosis of F1 hybrids
Checking the breeding qualities of producers by offspring
There are economic traits that appear only in females (egg production, milk production) Males are involved in the formation of these traits in daughters (it is necessary to check males for c
Selection of microorganisms
Microorganisms (prokaryotes - bacteria, blue-green algae; eukaryotes - unicellular algae, fungi, protozoa) - are widely used in industry, agriculture, medicine
Stages of selection of microorganisms
I. The search for natural strains capable of synthesizing the products necessary for a person II. The isolation of a pure natural strain (occurs in the process of repeated seeding of
Tasks of biotechnology
1. Obtaining feed and food protein from cheap natural raw materials and industrial waste (the basis for solving the food problem) 2. Obtaining a sufficient amount
Products of microbiological synthesis
q Feed and food protein q Enzymes (widely used in food, alcohol, brewing, winemaking, meat, fish, leather, textile, etc.)
Stages of the technological process of microbiological synthesis
Stage I - obtaining a pure culture of microorganisms containing only organisms of one species or strain Each species is stored in a separate test tube and goes to production and
Genetic (genetic) engineering
Genetic engineering is a field of molecular biology and biotechnology that deals with the creation and cloning of new genetic structures (recombinant DNA) and organisms with specified characteristics.
Stages of obtaining recombinant (hybrid) DNA molecules
1. Obtaining the original genetic material - the gene encoding the protein (trait) of interest The necessary gene can be obtained in two ways: artificial synthesis or extraction
Achievements in genetic engineering
The introduction of eukaryotic genes into bacteria is used for the microbiological synthesis of biologically active substances, which in nature are synthesized only by cells of higher organisms Synthesis
Problems and prospects of genetic engineering
Study of the molecular basis of hereditary diseases and the development of new methods for their treatment, finding methods for correcting damage to individual genes Increasing the resistance of the organ
Chromosomal engineering in plants
It consists in the possibility of biotechnological replacement of individual chromosomes in plant gametes or the addition of new ones In the cells of each diploid organism there are pairs of homologous chromosomes
Cell and tissue culture method
The method is the cultivation of individual cells, pieces of tissues or organs outside the body under artificial conditions on strictly sterile nutrient media with constant physical and chemical
Clonial micropropagation of plants
Cultivation of plant cells is relatively uncomplicated, the media are simple and cheap, and cell culture is unpretentious The method of plant cell culture is that a single cell or t
Hybridization of somatic cells (somatic hybridization) in plants
Protoplasts of plant cells without rigid cell walls can merge with each other, forming a hybrid cell that has the characteristics of both parents Gives the opportunity to receive
Cellular engineering in animals
Method of hormonal superovulation and embryo transplantation Isolation of dozens of eggs per year from the best cows by the method of hormonal inductive poliovulation (called
Hybridization of somatic cells in animals
Somatic cells contain the entire amount of genetic information Somatic cells for cultivation and subsequent hybridization in humans are obtained from the skin, which
Obtaining monoclonal antibodies
In response to the introduction of an antigen (bacteria, viruses, erythrocytes, etc.), the body produces specific antibodies with the help of B-lymphocytes, which are proteins called imm
Environmental Biotechnology
· Purification of water through the creation of wastewater treatment plants using biological methods q Oxidation of wastewater on biological filters q Utilization of organic and
Bioenergy
Bioenergy is a direction of biotechnology associated with obtaining energy from biomass with the help of microorganisms One of the effective methods for obtaining energy from biome
Bioconversion
Bioconversion is the conversion of substances formed as a result of metabolism into structurally related compounds under the action of microorganisms The goal of bioconversion is
Engineering enzymology
Engineering enzymology is a field of biotechnology that uses enzymes in the production of given substances The central method of engineering enzymology is immobilization
Biogeotechnology
Biogeotechnology - the use of the geochemical activity of microorganisms in the mining industry (ore, oil, coal) With the help of micro
The boundaries of the biosphere
Determined by a complex of factors; the general conditions for the existence of living organisms include: 1. the presence of liquid water 2. the presence of a number of biogenic elements (macro- and microelements
Properties of living matter
1. They contain a huge supply of energy capable of doing work 2. The speed of chemical reactions in living matter is millions of times faster than usual due to the participation of enzymes
Functions of living matter
Performed by living matter in the process of vital activity and biochemical transformations of substances in metabolic reactions 1. Energy - transformation and assimilation by living
Land biomass
Continental part of the biosphere - land occupies 29% (148 million km2) Land heterogeneity is expressed by the presence of latitudinal zonality and altitudinal zonality
soil biomass
Soil - a mixture of decomposed organic and weathered minerals; the mineral composition of the soil includes silica (up to 50%), alumina (up to 25%), oxide of iron, magnesium, potassium, phosphorus
Biological (biotic, biogenic, biogeochemical cycle) cycle of substances
The biotic cycle of substances is a continuous, planetary, relatively cyclic, irregular distribution of substances in time and space.
Biogeochemical cycles of individual chemical elements
Biogenic elements circulate in the biosphere, that is, they perform closed biogeochemical cycles that function under the influence of biological (life activity) and geological
nitrogen cycle
The source of N2 is molecular, gaseous, atmospheric nitrogen (it is not absorbed by most living organisms, because it is chemically inert; plants are able to assimilate only associated with ki
The carbon cycle
The main source of carbon is carbon dioxide of the atmosphere and water The carbon cycle is carried out through the processes of photosynthesis and cellular respiration The cycle begins with f
The water cycle
Carried out by solar energy Regulated by living organisms: 1. absorption and evaporation by plants 2. photolysis in the process of photosynthesis (decomposition
Sulfur cycle
Sulfur is a biogenic element of living matter; found in proteins as part of amino acids (up to 2.5%), is part of vitamins, glycosides, coenzymes, is present in vegetable essential oils
Energy flow in the biosphere
Source of energy in the biosphere - continuous electromagnetic radiation of the sun and radioactive energy q 42% of solar energy is reflected from clouds, dust atmosphere and the Earth's surface in
The emergence and evolution of the biosphere
Living matter, and with it the biosphere, appeared on Earth as a result of the emergence of life in the process of chemical evolution about 3.5 billion years ago, which led to the formation of organic substances
Noosphere
The noosphere (literally, the sphere of the mind) is the highest stage in the development of the biosphere, associated with the emergence and formation of civilized humanity in it, when its mind
Signs of the modern noosphere
1. Increasing amount of recoverable materials of the lithosphere - growth in the development of mineral deposits (now it exceeds 100 billion tons per year) 2. Mass consumption
Human influence on the biosphere
The current state of the noosphere is characterized by an ever-increasing prospect of an ecological crisis, many aspects of which are already manifesting themselves in full, creating a real threat to the existence
Energy production
q The construction of hydroelectric power plants and the creation of reservoirs causes flooding of large areas and the resettlement of people, raising the level of groundwater, erosion and waterlogging of the soil, landslides, loss of arable land
Food production. Depletion and pollution of the soil, reduction of the area of fertile soils
q Arable land covers 10% of the Earth's surface (1.2 billion ha) q Cause - overexploitation, imperfection of agricultural production: water and wind erosion and the formation of ravines, in
Reduction of natural biological diversity
q Human economic activity in nature is accompanied by a change in the number of animal and plant species, the extinction of entire taxa, and a decrease in the diversity of living things.
acid rain
q Increased acidity of rains, snow, fogs due to the emission of sulfur and nitrogen oxides from fuel combustion into the atmosphere q Acid precipitation reduces crops, destroys natural vegetation
Ways to solve environmental problems
In the future, a person will exploit the resources of the biosphere on an ever-increasing scale, since this exploitation is an indispensable and main condition for the very existence of h
Sustainable consumption and management of natural resources
q The most complete and comprehensive extraction of all minerals from the fields (due to the imperfection of the extraction technology, only 30-50% of the reserves are extracted from oil fields q Rec
Ecological strategy for the development of agriculture
q Strategic direction - increasing crop yields to feed a growing population without increasing acreage q Increasing crop yields without negative
Properties of living matter
1. The unity of the elemental chemical composition (98% is carbon, hydrogen, oxygen and nitrogen) 2. The unity of the biochemical composition - all living organisms
Hypotheses for the origin of life on Earth
There are two alternative concepts of the possibility of the origin of life on Earth: q abiogenesis - the emergence of living organisms from substances of inorganic nature
Stages of the development of the Earth (chemical prerequisites for the emergence of life)
1. The stellar stage of the Earth's history q The geological history of the Earth began more than 6 years ago. years ago, when the Earth was a red-hot over 1000
The emergence of the process of self-reproduction of molecules (biogenic matrix synthesis of biopolymers)
1. Occurred as a result of the interaction of coacervates with nucleic acids 2. All the necessary components of the process of biogenic matrix synthesis: - enzymes - proteins - pr
Prerequisites for the emergence of the evolutionary theory of Ch. Darwin
Socio-economic background 1. In the first half of the XIX century. England has become one of the most economically developed countries in the world with a high level of
· Set out in the book of Ch. Darwin "On the origin of species by natural selection or the preservation of favored breeds in the struggle for life", which was published
Variability
Substantiation of the variability of species To substantiate the position on the variability of living beings, Charles Darwin used common
Correlative (relative) variability
A change in the structure or function of one part of the body causes a coordinated change in another or others, since the body is an integral system, the individual parts of which are closely interconnected
The main provisions of the evolutionary teachings of Ch. Darwin
1. All kinds of living creatures inhabiting the Earth have never been created by anyone, but arose naturally 2. Having arisen naturally, species slowly and gradually
The development of ideas about the form
Aristotle - used the concept of a species when describing animals, which had no scientific content and was used as a logical concept D. Ray
Species criteria (signs of species identification)
Significance of species criteria in science and practice - determination of species belonging of individuals (species identification) I. Morphological - similarity of morphological inheritances
Population types
1. Panmictic - consist of individuals that reproduce sexually, cross-fertilized. 2. Clonial - from individuals that breed only without
mutation process
Spontaneous changes in the hereditary material of germ cells in the form of gene, chromosome and genomic mutations occur constantly throughout the entire period of existence of life under the influence of mutations
Insulation
Isolation - cessation of the flow of genes from population to population (limitation of the exchange of genetic information between populations) The value of isolation as a fa
Primary insulation
Not directly related to the action of natural selection, is a consequence of external factors Leads to a sharp decrease or cessation of migration of individuals from other populations
Environmental isolation
· Arises on the basis of ecological differences in the existence of different populations (different populations occupy different ecological niches) v For example, the trout of Lake Sevan
Secondary isolation (biological, reproductive)
Is of decisive importance in the formation of reproductive isolation Arises as a result of intraspecific differences in organisms Arose as a result of evolution Has two iso
Migrations
Migrations - the movement of individuals (seeds, pollen, spores) and their characteristic alleles between populations, leading to a change in the frequencies of alleles and genotypes in their gene pools
population waves
Population waves ("waves of life") - periodic and non-periodic sharp fluctuations in the number of individuals in a population under the influence of natural causes (S. S.
Significance of population waves
1. Leads to an undirected and abrupt change in the frequencies of alleles and genotypes in the gene pool of populations (random survival of individuals during the wintering period can increase the concentration of this mutation by 1000 r
Gene drift (genetic-automatic processes)
Genetic drift (genetic-automatic processes) - random non-directional, not due to the action of natural selection, change in the frequencies of alleles and genotypes in m
The result of genetic drift (for small populations)
1. Causes the loss (p = 0) or fixation (p = 1) of alleles in the homozygous state in all members of the population, regardless of their adaptive value - homozygotization of individuals
Natural selection is the guiding factor of evolution
Natural selection is the process of preferential (selective, selective) survival and reproduction of the fittest individuals and non-survival or non-reproduction
Struggle for existence Forms of natural selection
Driving selection (Described by C. Darwin, modern teaching developed by D. Simpson, English) Driving selection - selection in
Stabilizing selection
· The theory of stabilizing selection was developed by the Russian acad. I. I. Shmagauzen (1946) Stabilizing selection - selection acting in stable
Other forms of natural selection
Individual selection - selective survival and reproduction of individuals that have an advantage in the struggle for existence and elimination of others
The main features of natural and artificial selection
Natural selection Artificial selection 1. Arose with the emergence of life on Earth (about 3 billion years ago) 1. Arose in the
Common features of natural and artificial selection
1. Initial (elementary) material - individual characteristics of the organism (hereditary changes - mutations) 2. Carried out according to the phenotype 3. Elementary structure - population
The struggle for existence is the most important factor in evolution
The struggle for existence is a complex relationship of an organism with abiotic (physical conditions of life) and biotic (relations with other living organisms) fact
Reproduction intensity
v One roundworm produces 200 thousand eggs per day; the gray rat gives 5 litters per year, 8 rats, which become sexually mature at the age of three months; offspring of one daphnia per summer
Interspecies struggle for existence
Occurs between individuals of populations of different species Less acute than intraspecific, but its intensity increases if different species occupy similar ecological niches and have
Fight against adverse abiotic environmental factors
It is observed in all cases when individuals of the population find themselves in extreme physical conditions (excessive heat, drought, severe winter, excessive humidity, infertile soils, severe
The main discoveries in the field of biology after the creation of STE
1. Discovery of the hierarchical structures of DNA and protein, including the secondary structure of DNA - the double helix and its nucleoprotein nature 2. Deciphering the genetic code (its triplet
Signs of the organs of the endocrine system
1. They are relatively small in size (fractions or a few grams) 2. Anatomically unrelated 3. Synthesize hormones 4. Have an abundant network of blood vessels
Characteristics (signs) of hormones
1. Formed in the endocrine glands (neurohormones can be synthesized in neurosecretory cells) 2. High biological activity - the ability to quickly and strongly change the int
The chemical nature of hormones
1. Peptides and simple proteins (insulin, somatotropin, adenohypophysis tropic hormones, calcitonin, glucagon, vasopressin, oxytocin, hypothalamic hormones) 2. Complex proteins - thyrotropin, lute
Hormones of the middle (intermediate) share
Melanotropic hormone (melanotropin) - the exchange of pigments (melanin) in integumentary tissues Hormones of the posterior lobe (neurohypophysis) - oxytrcin, vasopressin
Thyroid hormones (thyroxine, triiodothyronine)
The composition of thyroid hormones certainly includes iodine and the amino acid tyrosine (0.3 mg of iodine is secreted daily in the hormones, therefore a person must receive daily with food and water
Hypothyroidism (hypothyroidism)
The cause of hypotherosis is a chronic deficiency of iodine in food and water. The lack of hormone secretion is compensated by the growth of the gland tissue and a significant increase in its volume.
Cortical hormones (mineralcorticoids, glucocorticoids, sex hormones)
The cortical layer is formed from epithelial tissue and consists of three zones: glomerular, fascicular and reticular, with different morphology and functions. Hormones related to steroids - corticosteroids
Adrenal medulla hormones (epinephrine, norepinephrine)
- The medulla consists of special yellow-staining chromaffin cells (these cells are located in the aorta, the branching point of the carotid artery and in the sympathetic nodes; they are all
Pancreatic hormones (insulin, glucagon, somatostatin)
Insulin (secreted by beta cells (insulocytes), is the simplest protein) Functions: 1. Regulation of carbohydrate metabolism (the only sugar lowering
Testosterone
Functions: 1. Development of secondary sexual characteristics (body proportions, muscles, growth of a beard, body hair, mental characteristics of a man, etc.) 2. Growth and development of reproductive organs
ovaries
1. Paired organs (size about 4 cm, weight 6-8 grams), located in the small pelvis, on both sides of the uterus 2. Consist of a large number (300-400 thousand) so-called. follicles - structure
Estradiol
Functions: 1. Development of female genital organs: oviducts, uterus, vagina, mammary glands 2. Formation of female secondary sexual characteristics (body build, figure, fat deposition, in
Endocrine glands (endocrine system) and their hormones
Endocrine glands Hormones Functions Pituitary gland: - anterior lobe: adenohypophysis - middle lobe - posterior
Reflex. reflex arc
Reflex - the body's response to irritation (change) of the external and internal environment, carried out with the participation of the nervous system (the main form of activity
Feedback mechanism
The reflex arc does not end with the body's response to irritation (by the work of the effector). All tissues and organs have their own receptors and afferent nerve pathways suitable for sensory
Spinal cord
1. The most ancient part of the CNS of vertebrates (first appears in the cephalochordates - the lancelet) 2. In the process of embryogenesis, it develops from the neural tube 3. It is located in the bone
Skeletal motor reflexes
1. Patellar reflex (the center is localized in the lumbar segment); vestigial reflex from animal ancestors 2. Achilles reflex (in the lumbar segment) 3. Plantar reflex (with
Conductor function
The spinal cord has a two-way connection with the brain (stem and cerebral cortex); through the spinal cord, the brain is connected with the receptors and executive organs of the body
Brain
The brain and spinal cord develop in the embryo from the outer germ layer - ectoderm It is located in the cavity of the brain skull It is covered (like the spinal cord) by three shells
Medulla
2. In the process of embryogenesis, it develops from the fifth cerebral bladder of the neural tube of the embryo 3. It is a continuation of the spinal cord (the lower boundary between them is the exit site of the root
reflex function
1. Protective reflexes: coughing, sneezing, blinking, vomiting, tearing 2. Food reflexes: sucking, swallowing, digestive juice secretion, motility and peristalsis
midbrain
1. In the process of embryogenesis from the third cerebral vesicle of the neural tube of the embryo 2. Covered with white matter, gray matter inside in the form of nuclei 3. Has the following structural components
Functions of the midbrain (reflex and conduction)
I. Reflex function (all reflexes are innate, unconditioned) 1. Regulation of muscle tone during movement, walking, standing 2. Orienting reflex
Thalamus (optical tubercles)
Represents paired accumulations of gray matter (40 pairs of nuclei), covered with a layer of white matter, inside - the III ventricle and reticular formation All nuclei of the thalamus are afferent, senses
Functions of the hypothalamus
1. The highest center of the nervous regulation of the cardiovascular system, the permeability of blood vessels 2. The center of thermoregulation 3. The regulation of the water-salt balance of the body
Functions of the cerebellum
The cerebellum is connected to all parts of the central nervous system; skin receptors, proprioceptors of the vestibular and motor apparatus, subcortex and cortex of the cerebral hemispheres The functions of the cerebellum are examined by
Telencephalon (large brain, large hemispheres of the forebrain)
1. In the process of embryogenesis, it develops from the first cerebral bladder of the neural tube of the embryo 2. It consists of two hemispheres (right and left), separated by a deep longitudinal fissure and connected
Cerebral cortex (cloak)
1. In mammals and humans, the surface of the cortex is folded, covered with convolutions and furrows, providing an increase in surface area (in humans it is about 2200 cm2
Functions of the cerebral cortex
Study methods: 1. Electrical stimulation of individual areas (the method of “implanting” electrodes into brain areas) 3. 2. Removal (extirpation) of individual areas
Sensory zones (areas) of the cerebral cortex
They are the central (cortical) sections of the analyzers, sensitive (afferent) impulses from the corresponding receptors are suitable for them Occupy a small part of the cortex
Functions of association zones
1. Communication between different areas of the cortex (sensory and motor) 2. Unification (integration) of all sensitive information entering the cortex with memory and emotions 3. Decisive
Features of the autonomic nervous system
1. It is divided into two sections: sympathetic and parasympathetic (each of them has a central and peripheral parts) 2. It does not have its own afferent (
Features of the departments of the autonomic nervous system
Sympathetic department Parasympathetic department 1. The central ganglia are located in the lateral horns of the thoracic and lumbar segments of the spinal
Functions of the autonomic nervous system
Most of the organs of the body are innervated by both the sympathetic and parasympathetic systems (dual innervation) Both departments have three kinds of actions on the organs - vasomotor,
Influence of the sympathetic and parasympathetic division of the autonomic nervous system
Sympathetic department Parasympathetic department 1. Accelerates the rhythm, increases the force of heart contractions 2. Expands the coronary vessels of the
Higher nervous activity of a person
Mental Mechanisms of Reflection: Mental Mechanisms of Designing the Future - Sensing
Features (signs) of unconditioned and conditioned reflexes
Unconditioned reflexes Conditioned reflexes
Methodology for the development (formation) of conditioned reflexes
Developed by I.P. Pavlov on dogs in the study of salivation under the action of light or sound stimuli, odors, touches, etc. (the salivary gland duct was brought out through the opening
Conditions for the development of conditioned reflexes
1. An indifferent stimulus must precede the unconditioned one (anticipatory action) 2. The average strength of an indifferent stimulus (with low and high strength, the reflex may not form
The meaning of conditioned reflexes
1. Underlying training, obtaining physical and mental skills 2. Subtle adaptation of vegetative, somatic and mental reactions to conditions with
Induction (external) braking
o Develops under the action of a foreign, unexpected, strong stimulus from the external or internal environment v Strong hunger, full bladder, pain or sexual arousal
Fading Conditional Inhibition
Develops with a systematic non-reinforcement of the conditioned stimulus with an unconditioned stimulus v If the conditioned stimulus is repeated at short intervals without reinforcing it without
Relationship between excitation and inhibition in the cerebral cortex
Irradiation - the spread of processes of excitation or inhibition from the focus of their occurrence to other areas of the cortex An example of the irradiation of the process of excitation
Causes of sleep
There are several hypotheses and theories of the causes of sleep: Chemical hypothesis - the cause of sleep is the poisoning of brain cells with toxic waste products, the image
REM (paradoxical) sleep
Comes after a period of slow sleep and lasts 10-15 minutes; then again replaced by slow sleep; repeated 4-5 times during the night Characterized by rapid
Features of higher nervous activity of a person
(differences from the GNI of animals) The channels for obtaining information about the factors of the external and internal environment are called signaling systems The first and second signaling systems are distinguished
Features of higher nervous activity of man and animals
Animal Human 1. Obtaining information about environmental factors only with the help of the first signaling system (analyzers) 2. Specific
Memory as a component of higher nervous activity
Memory is a set of mental processes that ensure the preservation, consolidation and reproduction of previous individual experience v Basic memory processes
Analyzers
All information about the external and internal environment of the body, necessary for interaction with it, a person receives with the help of the senses (sensory systems, analyzers) v The concept of analysis
Structure and functions of analyzers
Each analyzer consists of three anatomically and functionally related sections: peripheral, conductive and central Damage to one of the parts of the analyzer
The value of analyzers
1. Information to the body about the state and changes in the external and internal environment 2. The emergence of sensations and the formation on their basis of concepts and ideas about the world, i.e. e.
Choroid (middle)
Located under the sclera, rich in blood vessels, consists of three parts: the anterior - the iris, the middle - the ciliary body and the posterior - the vascular itself
Features of the photoreceptor cells of the retina
Rods Cones 1. Quantity 130 million 2. Visual pigment - rhodopsin (visual purple) 3. Maximum amount per n
lens
· Located behind the pupil, has the shape of a biconvex lens with a diameter of about 9 mm, absolutely transparent and elastic. Covered with a transparent capsule, to which the zinnia ligaments of the ciliary body are attached
The functioning of the eye
Visual reception begins with photochemical reactions that begin in the rods and cones of the retina and consist in the breakdown of visual pigments under the action of light quanta. Exactly this
Vision hygiene
1. Injury prevention (goggles at work with traumatic objects - dust, chemicals, chips, splinters, etc.) 2. Eye protection from too bright light - sun, electric
outer ear
Representation of the auricle and external auditory canal The auricle - freely protruding on the surface of the head
Middle ear (tympanic cavity)
Lies inside the pyramid of the temporal bone Filled with air and communicates with the nasopharynx through a tube 3.5 cm long and 2 mm in diameter - the Eustachian tube Eustachian function
inner ear
It is located in the pyramid of the temporal bone It includes a bone labyrinth, which is a complex structure of channels Inside the bone
Perception of sound vibrations
The auricle picks up sounds and directs them to the external auditory canal. Sound waves cause vibrations of the tympanic membrane, which are transmitted from it through the system of levers of the auditory ossicles (
Hearing hygiene
1. Prevention of hearing injuries 2. Protection of the hearing organs from excessive strength or duration of sound stimuli - the so-called. "noise pollution", especially in noisy environments
biospheric
1. Represented by cellular organelles 2. Biological mesosystems 3. Mutations are possible 4. Histological research method 5. Beginning of metabolism 6. About
"Structure of a eukaryotic cell" 9. Cell organoid containing DNA 10. Has pores 11. Performs a compartmental function in the cell 12. Function
Cell Center
Verification thematic digital dictation on the topic "Cell Metabolism" 1. Carried out in the cytoplasm of the cell 2. Requires specific enzymes
Thematic digital programmed dictation
on the topic "Energy exchange" 1. Hydrolysis reactions are carried out 2. End products - CO2 and H2 O 3. End product - PVC 4. NAD is restored
oxygen stage
Thematic digital programmed dictation on the topic "Photosynthesis" 1. Photolysis of water is carried out 2. Recovery occurs
Cell Metabolism: Energy Metabolism. Photosynthesis. Protein biosynthesis” 1. Carried out in autotrophs 52. Transcription is carried out 2. Associated with the functioning
The main features of the kingdoms of eukaryotes
Kingdom of Plants Kingdom of Animals 1. They have three sub-kingdoms: - lower plants (true algae) - red algae
Features of types of artificial selection in breeding
Mass selection Individual selection 1. Many individuals with the most pronounced hosts are allowed to breed.
Common features of mass and individual selection
1. Carried out by man with artificial selection 2. Only individuals with the most pronounced desired trait are allowed for further reproduction 3. Can be repeated
The world ocean occupies more than 2/3 of the planet's surface. The physical properties and chemical composition of the ocean waters provide a favorable environment for life. Just as on land, in the ocean, the density of life in the equatorial zone is highest and decreases with distance from it.
Compound
In the upper layer, at a depth of up to 100 m, unicellular algae that make up plankton live. The total primary productivity of phytoplankton in the World Ocean is 50 billion tons per year (about 1/3 of the entire primary productivity of the biosphere).
Almost all food chains in the ocean begin with phytoplankton, which feed on zooplankton animals (such as crustaceans). Crustaceans serve as food for many species of fish and baleen whales. Fish are eaten by birds. Large algae grow mainly in the coastal part of the oceans and seas. The highest concentration of life is in coral reefs.
The ocean is much poorer life, than land: the biomass of the world's oceans is 1000 times less. Most of the biomass formed - single-celled algae and other inhabitants of the ocean - die off , fall to the bottom and their organic matter is destroyed decomposers . Only about 0.01% of the primary productivity of the oceans comes through a long chain of trophic levels to humans in the form of food and chemical energy.
At the bottom of the ocean, as a result of the vital activity of organisms, sedimentary rocks are formed: chalk, limestone, diatomite and others.
Chemical functions of living matter
Vernadsky noted that there is no chemical force on the earth's surface that is more constantly acting, and therefore more powerful in its final consequences, than living organisms taken as a whole. Living matter performs the following chemical functions: gas, concentration, redox and biochemical.
redox
This function is expressed in the oxidation of substances during the life of organisms. Salts and oxides are formed in the soil and hydrosphere. The formation of limestone, iron, manganese and copper ores, etc., is associated with the activity of bacteria.
gas function
It is carried out by green plants in the process of photosynthesis, replenishing the atmosphere with oxygen, as well as by all plants and animals that emit carbon dioxide during respiration. The nitrogen cycle is associated with the activity of bacteria.
concentration
Associated with the accumulation of chemical elements in living matter (carbon, hydrogen, nitrogen, oxygen, calcium, potassium, silicon, phosphorus, magnesium, sulfur, chlorine, sodium, aluminum, iron).
Some species are specific concentrators of certain elements: a number of seaweeds - iodine, buttercups - lithium, duckweed - radium, diatoms and cereals - silicon, mollusks and crustaceans - copper, vertebrates - iron, bacteria - manganese.
Biochemical function
This function is carried out in the process of metabolism in living organisms (nutrition, respiration, excretion), as well as the destruction, destruction of dead organisms and their metabolic products. These processes lead to the circulation of substances in nature, the biogenic migration of atoms.
The biomass of the biosphere is approximately 0.01% of the mass of the inert matter of the biosphere, and about 99% of the biomass is accounted for by plants, and about 1% by consumers and decomposers. Plants dominate on the continents (99.2%), animals dominate in the ocean (93.7%)
The biomass of land is much larger than the biomass of the world's oceans, it is almost 99.9%. This is due to the longer life expectancy and the mass of producers on the surface of the Earth. In land plants, the use of solar energy for photosynthesis reaches 0.1%, and in the ocean - only 0.04%.
"2. Biomass of land and ocean»
Topic: Biomass of the biosphere.
1. Land biomass
Biomass of the biosphere - 0.01% of the inert matter of the biosphere,99% are plants. Plant biomass dominates on land(99,2%), in the ocean - animals(93,7%). The land biomass is almost 99.9%. This is due to the greater mass of producers on the surface of the Earth. The use of solar energy for photosynthesis on land reaches 0,1%, and in the ocean - only0,04%.
Land surface biomass is represented by biomasstundra (500 species) , taiga , mixed and deciduous forests, steppes, subtropics, deserts andtropics (8000 species), where living conditions are most favorable.
soil biomass. Vegetation cover provides organic matter to all the inhabitants of the soil - animals (vertebrates and invertebrates), fungi and a huge amount of bacteria. "Great gravediggers of nature" - this is how L. Pasteur called the bacteria.
3. Biomass of the oceans
– benthic organisms (from Greek.benthos- depth) live on the ground and in the ground. Phytobenthos: green, brown, red algae are found at a depth of up to 200 m. Zoobenthos is represented by animals.
– planktonic organisms (from Greek.planktos - wandering) are represented by phytoplankton and zooplankton.
– Nektonic organisms (from Greek.nektos - floating) are able to actively move in the water column.
View document content
"Biomass of the Biosphere"
Lesson. biomass biosphere
1. Land biomass
The biomass of the biosphere is approximately 0.01% of the mass of the inert matter of the biosphere, with about 99% of the biomass accounted for by plants, and about 1% by consumers and decomposers. Plants dominate on the continents (99.2%), animals dominate in the ocean (93.7%)
The biomass of land is much larger than the biomass of the world's oceans, it is almost 99.9%. This is due to the longer life expectancy and the mass of producers on the surface of the Earth. In land plants, the use of solar energy for photosynthesis reaches 0.1%, while in the ocean it is only 0.04%.
The biomass of various parts of the Earth's surface depends on climatic conditions - temperature, amount of precipitation. The harsh climatic conditions of the tundra - low temperatures, permafrost, short cold summers have formed peculiar plant communities with a small biomass. The vegetation of the tundra is represented by lichens, mosses, creeping dwarf trees, herbaceous vegetation that can withstand such extreme conditions. The biomass of the taiga, then mixed and broad-leaved forests gradually increases. The steppe zone is replaced by subtropical and tropical vegetation, where the conditions for life are most favorable, the biomass is maximum.
In the upper layer of the soil, the most favorable water, temperature, gas conditions for life. Vegetation cover provides organic matter to all the inhabitants of the soil - animals (vertebrates and invertebrates), fungi and a huge amount of bacteria. Bacteria and fungi are decomposers, they play a significant role in the circulation of substances in the biosphere, mineralizing organic substances. "The great gravediggers of nature" - this is how L. Pasteur called the bacteria.
2. Biomass of the world's oceans
Hydrosphere The "water shell" is formed by the World Ocean, which occupies about 71% of the surface of the globe, and land water bodies - rivers, lakes - about 5%. A lot of water is found in groundwater and glaciers. Due to the high density of water, living organisms can normally exist not only at the bottom, but also in the water column and on its surface. Therefore, the hydrosphere is populated throughout its thickness, living organisms are represented benthos, plankton and nekton.
benthic organisms(from the Greek benthos - depth) lead a benthic lifestyle, live on the ground and in the ground. Phytobenthos is formed by various plants - green, brown, red algae, which grow at different depths: green at a shallow depth, then brown, deeper - red algae that occur at a depth of up to 200 m. Zoobenthos is represented by animals - mollusks, worms, arthropods, etc. Many have adapted to life even at a depth of more than 11 km.
planktonic organisms (from Greek planktos - wandering) - inhabitants of the water column, they are not able to move independently over long distances, they are represented by phytoplankton and zooplankton. Phytoplankton includes unicellular algae, cyanobacteria, which are found in marine waters to a depth of 100 m and are the main producer of organic matter - they have an unusually high reproduction rate. Zooplankton are marine protozoa, coelenterates, small crustaceans. These organisms are characterized by vertical diurnal migrations, they are the main food base for large animals - fish, baleen whales.
Nektonic organisms(from Greek nektos - floating) - inhabitants of the aquatic environment, able to actively move in the water column, overcoming long distances. These are fish, squid, cetaceans, pinnipeds and other animals.
Written work with cards:
Compare the biomass of producers and consumers on land and in the ocean.
How is biomass distributed in the oceans?
Describe the biomass of land.
Define the terms or expand the concepts: nekton; phytoplankton; zooplankton; phytobenthos; zoobenthos; the percentage of the Earth's biomass from the mass of the inert matter of the biosphere; the percentage of plant biomass of the total biomass of terrestrial organisms; percentage of plant biomass of total aquatic biomass.
Board card:
What is the percentage of the Earth's biomass from the mass of the inert matter of the biosphere?
What percentage of the Earth's biomass is plants?
What percentage of the total biomass of terrestrial organisms is plant biomass?
What percentage of total aquatic biomass is plant biomass?
What percentage of solar energy is used for photosynthesis on land?
What % of solar energy is used for photosynthesis in the ocean?
What are the organisms that inhabit the water column and are carried by sea currents called?
What are the organisms that live in the ocean called?
What are the organisms that actively move in the water column called?
Test:
Test 1. The biomass of the biosphere from the mass of the inert matter of the biosphere is:
Test 2. The share of plants from the biomass of the Earth accounts for:
Test 3. Biomass of plants on land compared to biomass of terrestrial heterotrophs:
Makes up 60%.
Makes up 50%.
Test 4. Biomass of plants in the ocean compared to the biomass of aquatic heterotrophs:
It prevails and makes up 99.2%.
Makes up 60%.
Makes up 50%.
Less than the biomass of heterotrophs and is 6.3%.
Test 5. The use of solar energy for photosynthesis on land averages:
Test 6. The use of solar energy for photosynthesis in the ocean averages:
Test 7. Ocean benthos is represented by:
Test 8. Ocean Nekton is represented by:
Animals actively moving in the water column.
Organisms that inhabit the water column and are carried by sea currents.
Organisms that live on and in the ground.
Organisms that live on the surface film of water.
Test 9. Ocean plankton is represented by:
Animals actively moving in the water column.
Organisms that inhabit the water column and are carried by sea currents.
Organisms that live on and in the ground.
Organisms that live on the surface film of water.
Test 10. From the surface deep into the algae grow in the following order:
Shallow brown, deeper green, deeper red up to -200 m.
Shallow red, deeper brown, deeper green up to -200 m.
Shallow green, deeper red, deeper brown up to -200 m.
Shallow green, deeper brown, deeper red - up to 200 m.