BIO331H5 Lecture Notes - Lecture 3: Diversity Index, Gamma Diversity, Alpha Diversity
Document Summary
S = total # of species in a sample. Pi = fraction of the total number of individuals in sample that belong to species i. H" max is the maximum possible shannon diversity which occurs when all species have equal abundance. If you"re designing a conservation strategy, should you always prioritize conservation of more diverse sites: native versus invasive, a site may be diverse but full of potentially threatening (dominant) invasive species. Beta diversity: local diversity found within a particular habitat, change in species composition among habitats within a region, pairwise comparisons, jaccard"s index of similarity to make pair-wise comparisons of differences in species composition between sites. Cj = j/(a + b j) j = the number of species found in both sites, a. = number of species in site a, and b = number of species in site b. Uses presence-absence data (is it there or not there) Random: ex. salinity doesn"t seem very important in structuring the community.
