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Cory’s Shearwaters breed on remote islands and cliffs in the Cape Verdes, North Atlantic and Mediterranean, and winter predominantly off the coast of South America and southern Africa. Wintering birds are also known to occur regularly but in low numbers in the warm waters of the Gulf Stream, making them an occasional visitor to Canada’s Scotian Shelf through to the Laurentian Channel and southern Grand Banks. Because of the lack of monitoring at most breeding colonies, estimates of global population size for this species are tentative. As an uncommon visitor to the Atlantic coast, reliably assessing changes in the number of Cory’s Shearwaters travelling and foraging in Canadian waters relative to 1970 is not possible with available survey data. With less than 1% of the population occurring in Canadian waters, Canada’s conservation responsibility for this species is very low. This species has been identified as a priority for conservation and/or stewardship in one or more Bird Conservation Region Strategies in Canada.
Cory’s Shearwaters, like many pelagic seabirds, are attracted to fishing vessel offal and baited hooks which are a substantial cause of incidental mortality to both breeding and wintering birds (Granadeiro et al. 2006). This species is also vulnerable to oiling from accidental hydrocarbon releases throughout its marine range. The Eastern Canada Seabirds at Sea (ECSAS) Monitoring Program provides current data and information on Cory's Shearwater abundance and distribution in Canadian waters. These data provide critical information for environmental assessments related to offshore developments, emergency response related to oil spills, risk assessments, marine protected area planning, and other management and conservation initiatives.
Environment and Climate Change Canada and partners have developed Bird Conservation Region Strategies in each of Canada’s Bird Conservation Regions (BCRs). In these strategies, selected species are identified as priorities for one or more of the following reasons:
Select any of the sub-regions below to view the BCR strategy for additional details.