Biology 1001A Lecture Notes - Keystone Species, Species Richness, Species Evenness
23 Mar 2014
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Document Summary
Is a composite of: species richness- total number of different species in the community, species evenness- relative abundance of each of those different species in the community. Some goes in to waste: there"s decomposers in the food web. Immigration rate is higher on big islands and pushes the equilibrium to the right. Extinction rate is lower because bigger islands support more ecological niches: distant islands have fewer species. Nothing to do with the extinction rate. Ease with which species can reach the island (immigration) Application of island biography: findings can apply to habitat islands too, designing nature reserves, which is better for maintaining species diversity, single large or several small islands? (single large) As plant communities change, the community of animals also change. Ecological disturbance: physical damage to a community; removes biomass, fires, floods, etc . Succession: plant community is changing despite the fact that there was already a community there before it.
