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General Ecology_Mahaffy_Date__050410

General Ecology_Mahaffy_Date__050410 - Community Ecology...

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Community Ecology continued Island species Tend to lose dispersal abilities But… chance of adaptive radiation Island species often are larger than mainland species Species richness is larger on land bridge islands (Florida keys) than oceanic islands (Hawaii) Relaxation Being able to expand your niche Model predicts 50% loss of habitat means 10% loss of species 90% loss of habitat means 50% loss of species 95% loss of habitat means 75% loss of species Local extinctions Loose a population but not the entire species Recall islands often have lots of endemic specie so in their cases local extinctions are global extinctions What does this imply for attempts to protect more species? Need lots of habitat to have more species To have 10% more species you need 50% more habitat Apply the ideas to “continental islands” Patch of habitat but found on the mainland Forest surround by grasslands Implications of fragmentation More details later Patterns of diversity Generally greater diversity in more productive areas Marshes are the exception to this pattern Marshes are highly productive but have low diversity Depends on… Heterogeneity of habitat
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