By Jeffrey V. Wells
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Extra resources for Boreal birds of North America : a hemispheric view of their conservation links and significance
The second working hypothesis assumes that availability of upland nesting habitat is not limiting, but anthropogenic changes to uplands may reduce upland quality through increased habitat fragmentation. We hypothesize that (a) creation of travel corridors from roads, seismic lines, and other forest openings and (b) changes in vegetation structure–associated forest cover removal may result in increased predation rates due to immigration of new predator species, improved hunting success of native boreal predators, or growth of predator populations due to more abundant alternate prey.
HOW MIGHT WATERFOWL POPULATIONS CHANGE IN RESPONSE TO ANTHROPOGENIC ACTIVITY? Human activity is changing WBF waterfowl habitat directly through a variety of industrial and recreational activities and indirectly through climate change. However, the impact of these disturbances on waterfowl populations at various spatial scales is unclear. Natural disturbances such as forest fires, insect outbreaks, wind, and ice storms are an intrinsic part of boreal systems that contribute to and help maintain their heterogeneity (Niemi et al.
Pressey. 2000. Systematic conservation planning. Nature 405:243–253. , L. Dickson, R. Elliot, and G. Donaldson. 2003. Wings over water: Canada’s waterbird conservation plan. Canadian Wildlife Service, Ottawa, ON. Mittermeier, R. , C. G. Mittermeier, T. M. Brooks, J. D. Pilgrim, W. R. Konstant, G. A. B. Da Fonseca, and C. Kormos. 2003. Wilderness and biodiversity conservation. Proceedings of the National Academy of Sciences 100:10309–10313. , R. A. Mittermeir, C. G. Mittermeir, G. A. B. da Fonseca, and J.