EESA01H3 Chapter : chapter notes

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31 Oct 2010
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Species diversity: the number and the variety of species in the world or in a particular region. Evenness/relative abundance: numbers of individuals of different species are equal or skewed. Taxonomists: scientists who classify species (use physical appearance and genetic makeup to determine) Genetic diversity: varieties in dna present among individuals within species and populations. What enables a species to adapt to ecological change inbreeding depression when genetically similar parents mate and produce weak or defective offspring ecosystem diversity: number/variety of ecosystems diversity of biotic community within specific area. Some groups rise in species through adaptive radiation. Or diversified because of a tendency to be separated by barriers that promote allopatric speciation. Or accumulated species through time because of low rates of extinction. 1. 7 million to 2. 0 million species of plants, animals, and microorganisms. Total number: 3 million to 100 million. Many are overlooked (i) unexplored areas, (ii) tiny, (iii) difficult to identify.

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