discuss two factors that explain the degree of endemism in an area?
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Percentage versus Counts
Endemism may be expressed as a percentage of all extant taxa present, or as the absolute number of endemics in an area. Depicting plant endemics in biogeographic regions as percentages or counts, and using area and latitude as explanatory variables, results in different patterns with different significance (Figure 1). Some species-poor areas, such as oceanic islands and arid regions, although low in actual numbers of endemics, may support a high percentage of endemic taxa. Other areas, such as Madagascar, the Cape Floristic Region, and parts of the Neotropics combine high richness and high endemism for some taxa. Ideally, both measures of endemism should be considered when explaining patterns, but seldom are
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