ENVS200 Lecture Notes - Lecture 11: Competitive Exclusion Principle, Hydrograph, Continuum Concept
15 Jun 2015
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Document Summary
Larger patches support more individuals with a lower chance of extinction, Large island supports more species than a small patch. Darlingtons rule states that a 10 fold increase in are will result in a doubling in the number of species. Number of birds was effectively predicted from a model relating richness to island area. Hinges on habitat heterogeneity, larger islands more likely to have more habitat types and therefore can support more species. Further the isalnd is from a potential source of colonists, the fewer the number of species it will support. Gauses principle - no two species can occupy the same niche. Corollary - if two siilar species exist in the same ecosystem they must use at least one niche dimension differently. Describing reasons for variations in species richness is faciltated through examining patterns along habitat gradients. Larger patches support more species than smaller aptches.
