9 - Habitat loss and fragmentation

Bisection by roads reduces interior habitat by half

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Unformatted text preview: habitat Interior = 4 X 8.7 ha = 34.8 ha M9.29 BIO 3115 Université d’Ottawa / University of Ottawa 2012 Nest predation and edge effects nest predation rates on songbirds in eastern North American forests increase near forest edge, and are still elevated 600 m into the fragment. Increased predation due to increased population density of “edge” species such as raccoons. 7 days 14 days 25 days 100 % predation 80 60 40 20 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Distance from edge (m) M9.30 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M9.15 BIO 3115 Conservation Biology 2009-2010 Habitat loss and degradation: two case studies M9.31 BIO 3115 Université d’Ottawa / University of Ottawa 2012 Habitat distribution of threatened mammals and birds 50 Mammals 40 Birds 30 20 10 Oceanic islands Tundra & polar ice Marine Seasonal woodlands Mountains Freshwater Arid Coasts & estuaries Grassland heath & scrub 0 Tropical forest Tropical moist forests North American wetlands % threatened species occupying habitat Habitat type M9.32 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M9.16 BIO 3115 Conservation Biology 2009-2010 Anthropogenic causes of...
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