9 - Habitat loss and fragmentation

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Unformatted text preview: .0 1 10 100 1000 Forest area (ha) M9.11 BIO 3115 Université d’Ottawa / University of Ottawa 2012 As distance from source (New Guinea) increases, immigration rates decline. Hence, islands further away should have lower equilibrium species richness. If fragments are islands, the same pattern should be observed. Degree of Saturation (%) Fragmentation and island biogeography theory II. Fragment isolation 100 10 1 0 5000 10000 Distance from New Guinea (km) M9.12 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M9.6 BIO 3115 Conservation Biology 2009-2010 Species loss and forest fragmentation: Dog’s mercury Secondary forest is suboptimal habitat. Persistence in suboptimal habitat requires constant immigration from neighbouring source (mature forest). So incidence declines with distance from nearest source. 100 Incidence (% of fragments occupied) 80 60 40 20 0 0.0 0.5 1.0 1.5 2.0 2.5 Distance from nearest mature forest source (km) M9.13 BIO 3115 Université d’Ottawa / University of Ottawa 2012 Metapo...
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