Patterns of Diversity

Patterns of Diversity - Goals for Patterns of Diversity...

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Goals for Patterns of Diversity • Explain two basic global patterns of diversity-- where is there greatest diversity? Where is there the least diversity? • Be able to define climate • Explain the contribution of climate to patterns of diversity • Explain Hadley cells, ITCZ, rain-shadow and their effect on diversity Species are not randomly distributed on the face Red areas = 1.4 land area but have 44% of vascular plants and 35% of 4 key vertebrate groups (mammals, amphibians, birds, and reptiles) Myers et al. 2000 Nature Biodiversity “hotspots” - places with many specie endemic (occur in no other regions) General patterns in biodiversity: the latitudina
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Number of native amphibian species Number of native vascular plant species Number of tree species decreases with increasing Stevens 1992, American Naturalist Costa Rica Alaska What are latitudes? ARCTIC ZONE ANTARCTIC ZONE TROPICS TEMPERATE ZONE TEMPERATE ZONE
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Climate has a large influence on veget What is climate?
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What determines climate? Incident solar radiation (varies with season and
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Patterns of Diversity - Goals for Patterns of Diversity...

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