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Ecology Ecology- the study of how organisms interact with each other and with their environment
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Abiotic Factors Abiotic factors- the nonliving parts of the environment. They include: Sunlight Water Temperature Wind Soil type The atmosphere The types and amounts of abiotic factors that are available in an ecosystem help determine which organisms can live there.
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Biotic Factors biotic factors- all the living things or once-living things in an environment. Ex: Animals Plants Bacteria Fungi
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Organization In The Environment The biosphere consists of all life on Earth and all parts of the Earth in which life exists, including land, water, and the atmosphere.
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Biome — a geographic area that contain groups of ecosystems with similar biotic and abiotic features. Terrestrial (land) Biomes include: Forests Deserts Tundra Grasslands
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Aquatic Biomes include: Marine Freshwater (rivers & lakes) Estuaries
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Ecosystem—all the organisms that live in a place, together with their physical environment(abiotic factors) The types and amounts of abiotic factors that are available in an ecosystem help determine which organisms can live there
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Community—All the populations of species that live in the same area and interact
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Population-a group of individuals that belong to the same species and live in the same area
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Organism- any unicellular or multicellular form exhibiting all of the characteristics of life, an individual
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The size of a population can increase or decrease in response to changes in biotic or abiotic factors in the environment. Increase when: individuals move into an area (Immigration) when more individuals are born Decrease when: Individuals move away from an area(Emigration) When individuals die Population density describes the number of organisms in an area relative to the amount of space available.
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Limiting factors: any biotic or abiotic factor that restricts an organism’s ability to survive and therefore limiting the size of a population They include: Lack of sufficient resources such as: food supply water supply living space shelter predation competition disease
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Limiting factors: Differ for different ecosystems They contribute to fluctuations in wildlife populations Can occur “naturally” or can be caused by “Human Activities” Biotic Potential: the potential growth of a population if it could grow in perfect conditions with no limiting factors
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Carrying capacity- the largest number of individuals of a species that an ecosystem can support over time The limiting factors of an area determine the area’s carrying capacity. Overpopulation occurs when a population's size becomes larger than the ability of the area to support it.
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Succession-the orderly, natural change in communities over time Primary succession: development of living communities from BARE ROCK NO soil present Ex. Rock lichens moss ferns shrubs trees mature trees
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Pioneer organism: the first organism to inhabit a community (ex. lichens) Climax community: a stable, mature community that undergoes little or no succession Primary succession takes a relatively long time to reach this point
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Secondary succession: the development of living communities that takes place when a community is disrupted by natural disasters or human impact Soil IS present Takes less time to reach climax community Ex. Abandoned farms, fires, volcanic eruptions..
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Organisms whose abundance or activity is essential in maintaining the nature of a habitat. They may be : important habitat modifiers Pollinators Seed dispersers Ex: Grey wolf Elephant Kangaroo rat Chipmunk Sea urchin Sea otter
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All populations in a community share a habitat- the physical place where a population or an organism lives. Niche-the role a species plays in a community (job) Symbiosis-the relationship in which there is a close and permanent association between organisms of different species 3 types: Mutualism Parasitism Commensalism
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Relationship in which both organisms benefit Organism 1 = = Benefit Organism 2 = = Benefit
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Ants and the acacia tree
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Relationship in which one species benefits and the other is harmed Organism 1 = = benefit Organism 2 = = harmed
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Tapeworms
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relationship in which one species benefits and the other is neither harmed nor benefited Organism 1 = = benefit Organism 2 = = no harm, no benefits
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Spanish moss growing on trees
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RelationshipOrganism 1Organism 2 Mutualism Benefit Benefit Commensalism BenefitNo benefit, not harmed Parasitism BenefitHarmed
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