EEB321H1 Lecture 4: L4 - Diversity Measures Cont'd & Succession
15 Feb 2017
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Different models predict different sad (rank abundance curves) Other ways to look at communities and try to compare them. Graphs shows 4 rank abundance curves (recall there are many ways to express species abundance distribution sad) (rank abundance curves are just 1 out of the 3 ways. Express species abundance as number of individuals (on log scale) vs species rank (species ranked from must abundant = 1, to least abundant = 10) Then look at shape of curve as go from most abundant to least abundant. Depending on whether it drops quickly or slowly can tell us a lot about. For rank abundance curves there are (1) statistical distribution models and (2) mechanistic/causal distributions models describing the shapes of the curves. Statistical models just describe the data from the communities. Mechanistic/causal models give some idea behind the model: right graph: statistical distribution models. Sampled tree communities along a transect on mountains in oregon.
