Ch 52- ecology (1 slide per page)

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Unformatted text preview: gov/sp2UserFiles/Place/66151015/ifarange/us_expansion_map00.gif http://www.ars.usda.gov/sp2UserFiles/Place/66151015/ifarange/world00.gif 25 History determines distribution 1. Continental drift • Continental Drift 2. Mass extinctions 3. Hunting 4. Habitat loss and fragmentation 26 History Continental drift helps explain present species distributions and abundances Why do ratite birds only occur in the southern hemisphere? Cassowary American rhea Ostrich Elephant bird Emu Moa Kiwi 27 History Continental drift helps explain present species distributions and abundances Why do ratite birds only occur in the southern hemisphere? Evolved in Gondwana and never dispersed to Laurasia before further continental breakups Cassowary American rhea Ostrich Elephant bird Emu Moa Kiwi 28 Historical Factors Mass extinctions help explain present species distributions and abundances e.g. loss of large reptiles after comet at end of cretaceous paved way for new mammal species 29 History More recent historical factors can help explain present species distributions and abundances • Hunting • Habitat destruction 31 Variation in abiotic factors differentiate the major biomes Figu...
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This note was uploaded on 02/12/2014 for the course BIOLOGY 2011 taught by Professor Woo during the Fall '10 term at University of Central Florida.

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