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9 - Habitat loss and fragmentation

M919 bio 3115 universit dottawa university of ottawa

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Unformatted text preview: d population isolation Isolation of populations of carabid beetles by roads and parking lots inhospitable habitat between fragments reduces movement, thereby increasing population isolation. M9.20 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M9.10 BIO 3115 Conservation Biology 2009-2010 III.2. Movement barriers, immigration and local extinction in southeastern Ontario wetlands, herptile (reptiles and amphibians) richness declines with the density of paved roads on adjacent lands. Many herptiles have metapopulation structure: local extinctions not balanced by recolonization, so richness declines. 0.6 Herptile species richness 0.4 0.2 0.0 -0.2 -0.4 -4 -2 0 2 4 Paved road density (2000 m) M9.21 BIO 3115 Université d’Ottawa / University of Ottawa 2012 III.3. Movement barriers and increased mortality Roads are an important source of mortality for many species, including birds, reptiles, amphibians and mammals, e.g. Florida panther. M9.22 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M9.11 BIO 3115 Conserv...
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