By Jeffrey V. Wells
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Additional resources for Boreal birds of North America : a hemispheric view of their conservation links and significance
2003), and in 1999 100,000 km (63,000 mi) of seismic lines had been approved (Lee and Boutin 2006). 5 to 10 km per km2 were also observed in 98% of the townships in northeast Alberta by 2001. In summer, water is needed to run pumpjacks; this water is taken from wetlands and freshwater aquifers. These pumpjacks and compressor stations are often placed near wetlands, which can also result in habitat loss. The effects of these disturbances on waterfowl, however, have not yet been quantified at either community or population level.
Research on cumulative effects in Alberta has documented the expansion of coyote and other generalist predators into the boreal region with increasing human disturbances (Nielsen et al. 2007), and greater use of linear features by wolves (James and Stuart-Smith 2000); thus, human disturbances may also increase accessibility by predators to adults, eggs, and ducklings. This top-down hypothesis remains untested and, to date, there are no published estimates of breeding season mortality in these areas.
Blancher, M. S. W. Bradstreet, G. S. Butcher, D. W. Demarest, E. H. Dunn, W. C. Hunter, E. E. InigoElias, J. A. Kennedy, A. M. Martell, A. O. Panjabi, D. N. Pashley, K. V. Rosenberg, C. M. Rustay, J. S. Wendt and T. C. Will. 2004. Partners in Flight North American landbird conservation plan. Cornell Lab of Ornithology, Ithaca, NY. Ricketts, T. , E. Dinerstein, D. M. Olson, C. J. Loucks, et al. 1999. Terrestrial ecoregions of North America: a conservation assessment. Island Press, Washington, DC.