BIS 2B Lecture Notes - Lecture 2: Intertropical Convergence Zone, Allopatric Speciation, Hadley Cell

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Species are categorized by what environment they"re in. Species are categorized by their role in their environment. Species - (focus of most of the course) Similar living organisms make up a species; varying species can coexist in one environment at one time. One species can have individual members which differ in genetic makeup. One species can have individual members which have the same genetic makeup but different physical appearance. The diversity index (d) represents the two fundamental aspects of an environment: How many species are in the environment overall. How many individuals are in the species. The diversity index can be calculated using a formula: D = (proportion of individuals in species 1) -(proportion of individuals in species 1 (proportion of individuals in species 2) -(proportion of individuals in species 2) (proportion of individuals in species n) -(proportion of individuals in species n) The bigger the number, the more diverse that area is.

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