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| dry weigh of organic matter comprising a group of organisms in a particular habitat; increases if ps>rs, decreases if rs>ps |
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| symbiotic relationship whereby one organism benefits but the other is neither helped nor harmed |
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| all the organisms that inhabit a particular area; an assemblage of populations of different species living close enough for potential interaction |
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| battle for limited resources in an ecosystem; greatest for related species in same niche |
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| concept that when 2 species compete for same resources, one population will use resources more efficiently and have reproductive advantage that will eventually lead to elimination of other population |
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| feed off of other living things; primary eat plants, secondary eat other primary; numbers go down as trophic levels go up |
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| camouflage; making potential prey difficult to spot against its background |
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| biome with trees that lose their leaves as predominant vegetation |
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| organism that breaks down and lives off of organic material/ waste; orgnaisms that allow for chemical cycling in an ecosystem |
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| unicellular organism with silicon cell wall; form of plankton in food chain; primary producer in marine ecosystems |
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| all the organisms in a given area as well as the abiotic factors with which they interact; a community and its physical environment |
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| process by which nutrients, particularly phosphorous and nitrogen, become highly concentrated in a body of water, leading to increased growth of organisms such as algae; cultural if originated by human usage |
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| biome with grass as predominant vegetation, often wet and dry season |
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| copying the coloration or behavior of an undesirable organism to avoid predation; similar color patterns between different species to increase numbers |
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| symbiosis whereby both organisms benefit |
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| assimilation of atmospheric nitrogen by certain prokaryotes (bacteria) into nitrogenous compunds that can be used by plants |
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| consumer at many trophic levels; humans |
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| composed of O3; shileds earth from ultraviolet rays; destroyed by CFCs; reduction could increase skin cancer rates |
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| symbiosis whereby one organism benefits at the expense of another |
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| group of organisms of the same species |
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| autotrophic; first trophic level |
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| conferous forest is predominant, relatively infertile soil |
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| different feeding relationships in an ecosystem which determine the route of energy flow and the pattern of chemical cycling |
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| biome with greatest diversity of plant species; threatened by cut-burn-cultivate-abandon agricultural practices |
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| grasses and sedges that can tolerate long dark winters; permafrost year round |
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| warning (aposematic) coloration |
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| bright coloration of animals with effective physical or chemical defences that acts as a warning to predators |
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