Biology 3445F Lecture Notes - Lecture 11: Serpentine Soil, Spatial Analysis, Beta Diversity
15 Nov 2016
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Changes in abiotic factors through space (or time) Lack of essential nutrients (n, p, k) Coenocline represents all species response functions combined along a single gradient. Turnover change in species composition along environmental gradients (fig a has lower turnover than fig b) Ecotones transition zones b/n communities or habitat types. Influence of one area on the other (edge effect) Displays species distributions along one or more environmental gradients. 2 methods interpret patterns in species composition: classification used for grouping ecological communities, ordination used for indirect gradient analysis. Locations closer together are more similar than locations further apart (often for both species and the environment) Species composition of communities more similar when communities are closer together: positive (more similar than expected, negative (less similar than expected) Relationship b/n alpha (local) and gamma (regional) diversity. Variation in species composition among sites w/in a region. Rate or magnitude of change in species composition along a gradient (or through space)
