9 - Habitat loss and fragmentation

4 bio 3115 conservation biology 2009 2010 bird

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Unformatted text preview: 09-2010 Bird species richness Breeding birds species richness on isolated woodlots in Illinois 40 30 20 10 0 1 10 100 1000 Woodlot area (ha) M9.9 BIO 3115 Université d’Ottawa / University of Ottawa 2012 Species has feeding & breeding territories of several ha in open woodlands. Incidence is low in small forest fragments and increases with fragment size. In fragments < 5 ha, the species is absent altogether. Incidence (% of fragments occupied) Species loss and forest fragmentation: the Great Spotted Woodpecker 80 70 60 50 40 30 20 10 0 0.0001 0.01 0.1 1 10 100 Woodland fragment area (ha) M9.10 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M9.5 BIO 3115 Conservation Biology 2009-2010 For a number of species, incidence (probability of occurrence) increases with forest area. This suggests that in small forest fragments, these species will be lost. Probability of occurrence Area-sensitive forest interior birds in eastern North American temperate forests 1.0 0.8 0.6 0.4 Wood thrush Scarlet tanager 0.2 0...
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