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13 Cards in this Set
- Front
- Back
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Community |
agroup of populations of different species living close enough to interact : plant and animal interactions : intra- and interspecific interactions |
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What 4 factors affects/limit the distribution and abundance of species within acommunity? |
1. Dispersal 2.Habitat selection 3.Abiotic factors 4.Biotic factors |
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Dispersal |
Movementof individuals of a population within or between communities |
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examples of abiotic factors |
- Temperature -Water availability -Light availability -Salinity -pH -Oxygen availability -Nutrient availability |
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•Predation = ? •Herbivory = ? •Parasitism = ? •Mutualism = ? •Commensalism = ? •Competition = ? |
•Predation +/- •Herbivory +/- •Parasitism +/- •Mutualism +/+ •Commensalism +/0 •Competition -/- |
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Competition-/- |
differentspecies compete for resource(s) that limits their growth or survival |
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Competitive exclusion principle |
Within a community, two species with identical ecological niches cannot permanently coexist |
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Ecological niche |
sum of a species use of the biotic and abiotic resources in its environment |
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Resource partitioning |
differentiation of niches enabling similar species to coexist in a community |
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Realized niche |
niche in the presence of other organisms |
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Fundamental niche |
defines the environmental space an organism can exist |
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Trophic structure |
feeding relationships of a community |
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Energetic hypothesis |
suggests food chain length is limited by energy transfer : ~10% efficiency of energy transfer betweentrophic levels |
