Lecture34_Communities

Lecture34_Communities - Community Structure I. Early ideas:...

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Unformatted text preview: Community Structure I. Early ideas: Are communities "super-organisms?" Community = the collection of species in a particular area key idea is that these species interact via Coevolution = any interaction between species that leads to natural selection and mutual adaptation Hypothesis 1: Communities are highly structured 1. Communities have a mature ("climax") stage 2. Community composition is predictable because it is determined by 3. Communities develop over time like an individual organism. If disturbed, the climax community will Hypothesis 2: Communities are loose assemblages of species 1. Communities are not stable. They are 2. Community composition is not predictable, because the species present in an area are there 3. If a community is disturbed, C. Tests of these ideas Mount St. Helens blast zone Record which species are present 25+ years after area was sterilized, Results: Conclusion? II. Disturbance and succession A. Studying disturbance = any change that removes biomassA....
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Lecture34_Communities - Community Structure I. Early ideas:...

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