Chapter 41 - Species Interactions

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Last updated 1:23 PM on 9/8/26
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8 Terms

1
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Biological community

group of populations of different species living close enough to interact

2
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Interspecific interactions

  1. competition

  2. predation

  3. herbivory

  4. parasitism

  5. mutualism

  6. commensalism


3
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How are community interactions classified

based on whether they help, harm, or have no effect on the species involved

  • summarized as positive, negative, or no effect (0)


4
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competition (-/-)

  • is a -/- interaction that occurs when individuals of different species compete for a resource that limits the survival and reproduction of each species

  • ex. weeds growing in a garden compete with garden plants for nutrients and water


5
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Competition exclusion

  • local elimination of a competing species

  • caused by strong competition


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competition exclusion principle

two species competing for the same limiting resources cannot coexist in the same place

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Ecological niche

the total of a species use of biotic and abiotic resources

  • can also be thought of as an organism’s ecological role

  • ecologically similar species can coexist in a community if there are one or more significant differences in their niches


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Resource Partitioning

differentiation of ecological niches, enabling similar species to coexist in a community

  • a species fundamental niche may differ from its realized niche due to competition