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9 - Habitat loss and fragmentation

M96 bio 3115 universit dottawa university of ottawa

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Unformatted text preview: d’Ottawa / University of Ottawa 2012 M9.3 BIO 3115 Conservation Biology 2009-2010 Mechanisms of extirpation as a result of habitat loss and fragmentation loss of habitat heterogeneity (some habitats lost) reduced migration between fragments due to inhospitable areas colonization of fragments by new species (e.g. exotics) that would otherwise be excluded, resulting in increased competition, predation or parasitism secondary extinctions; fragmentation may disrupt important ecological relationships which may lead to subsequent (secondary) extinctions M9.7 BIO 3115 Université d’Ottawa / University of Ottawa 2012 Fragmentation and island biogeography theory I: Fragment size Since species richness increases with increasing island size... …if fragments are “islands”, richness should increase with fragment size. 100 Number of species Hispaniola Puerto Rico Cuba Jamaica Montserrat 10 Saba Redona 1 0.1 10 1000 100000 Area (square miles) M9.8 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M9.4 BIO 3115 Conservation Biology 20...
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