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Chapter 55

biol 130 exam 2

TermDefinition
ecological community all species that coexist and interact in a defined area
guild group of species that use similar resources
functional group species that function in similar ways buy may or may not use similar resources
food chain depicts who eats whom in a community which reflects trophic levels
food web more realistic depiction of community feeding relationships
heat loss energy used for respiration and metabolism; dissipated as het and lost to the community
species composition number and kinds of species they contain
species richness number of species in a community
species evenness distribution of abundances of individuals across species
biodiversity describes levels diversity, from genes to species to communities, which are interconnected
outbreaks massive, sudden population increases
biotic resistance ability of resident species to exclude or stow population growth of non-native species
direct interaction occurs between 2 species
indirect interactions occurs when a direct relationship between 2 species in mediated by a 3rd (or more) species
trophic cascade one consumer species can cause an indirect effect
keystone species species that exerts influence on a community that is out of proportion with its abundance
foundation species provide food and habitat for other species and thus have a large effect on communities
disturbance distribution in a community by an external force, often abiotic
successsion sequence of changes in the biota following a disturbance in which one kind of community is replaced by another
primary succesion begins after a disturbance that removes all organisms and exposes bare substrate
secondary succession in an area that has life, soil, and seed banks
alternative states different community assemblages that could develop at the same location under similar conditions
community function the way a community works
Created by: acatherine04
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