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Transcript
Patterns of Species Diversity alpha, beta, gamma The biodiversity of planet Earth is the total variability of life forms. Currently about 1.9 million species are known, but this is thought to be a significant underestimate of the total number of species. The actual number may be as high as 50 million or more. Wiki Latitudinal Diversity Gradients The species richness of samples of vegetation from South Africa shows a classic humped-back relationship with ecosystem productivity as inferred from amount of biomass per unit area. JAMES W. PORTER, JAMES F. BATTEY, AND G. JASON SMITH Perturbation and change in coral reef communities (Acropora cervicornis/spatial analysis/Dry Tortugas/temperature effects) ABSTRACT Ninety-six percent of surveyed shallow-water Dry Tortugas reef corals died during the severe winter of 19761977. Data from skeletal stains indicate that death occurred during the mid-January intrusion of 14 degree C water onto the reef. Proc. Nat Acad. Sci. USA Vol. 79, pp. 1678-1681, March 1982 http://darwinproject.mit.edu/?page_id=14 A Coccolithophore (Gephyrocapsa oceanica)
