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lecture15 - Island Biogeography July 22 1 Island Analogues...

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Unformatted text preview: Island Biogeography July 22 1 Island Analogues Island Analogues isolated habitats suitable for a given species surrounded by unsuitable area Why Study Islands? Why Study Islands? Islands contain well-defined populations that are relatively isolated Islands vary in a number of important factors (e.g. age, area, altitude, species composition), allowing the assessment of interrelationships between these factors Island Biogeography Island Biogeography study of the factors determining the distribution and abundance of organisms on islands Island Island an area of land surrounded by water smaller than a continent Examples: lakes, ponds, mountain tops, trees, habitat patches, host for parasites Relationship between Number of Species and Island Area Relationship between Number of Species and Island Area N u m b e r o f s p e c i e s ( l o g s c a l e ) Area (km 2 ) (log scale) Log S = Log c + z Log A S = Number of species c = constant (y-intercept) A = Area of island z = constant (slope) Island Biogeography July 22 2 Land Plants in the Land Plants in the Galapagos Islands Galapagos Islands z = 0.32 Amphibians and Reptiles of the West Indies Amphibians and Reptiles of the West Indies z = 0.30 Island Biogeography July 22 3 Why are there more species on larger islands?Why are there more species on larger islands?...
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This note was uploaded on 01/06/2010 for the course EVE 101 taught by Professor Strong,d during the Spring '08 term at UC Davis.

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lecture15 - Island Biogeography July 22 1 Island Analogues...

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