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| A group of organisms that are able to interbreed with eachother and produce fertile offspring |
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| group of interbreeding individuals of a particular species |
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| local population of a species that are linked by dispersal-- limited to patches of suitable habitat |
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| assemblage of interacting organisms that share the same habitat |
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| composed of all organisms in an area and their non living enviornment (abiotic) |
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| defined area of plants and animals in a particular climate-- named after dominant vegetation |
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relationship b/t 2 different species
- often long term
-for survival |
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both organisms benefit
-obligate- both are dependent on eachother for survival |
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| mutualism not necessary, one or both species can survive without the other |
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| one species benifits while other is unaffected |
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| one species restricts the sucess of the other without being affected-- rare |
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| no species benefit for resources |
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| biochemicals produced by some plants "chemical warfare" |
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| predetor feeds on prey to survive-- includes herbivores and detrivores |
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Definition
| produce organic compounds form photosynthesis |
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| herbivores/ primary consumers |
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| carnivores/secondary consumers |
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| consume detritus (dead, fecal matter) |
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| mass of all living biological organisms in a given ares/ ecosustem at a given time |
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Definition
Stage in food chain: a stage in a food chain that reflects the number of times energy has been transferred through feeding |
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| # of different species in a particular area relative to the # of individuals |
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| plant communities replace eachother over time in a particular landscape due to disturbances |
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Definition
| begins in an area that lacks any organic matter, not yet altered by living organisms |
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| ecological succession in an enviorment already modiefied by biota (ex- fire) |
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| communities that develop over the course of succession |
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| communities that have reached a steady state or equilibrium species present are those best adapted |
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Definition
limited group of "early succesional species" modify the envirnment so that it is less suitable for other early species
Ex: Plants that fix nitrogen increase resources available for other plants |
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Definition
early plants modify the site and habitat- both early and late successional species
ex) allelopathy |
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Definition
plants modify enviornment to become less suitable for "early" but little affects to later
ex) shade tolerance |
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| loss of genetic variation that occfurs when a new population is established by a very small # of individuals from a larger population |
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