Moors-Murphy, H. B.

Submarine canyons as important habitat for cetaceans, with special reference to the Gully: A review

2014

Deep Sea Research Part II: Topical Studies in Oceanography

104

6-19

"There has been much research interest in the use of submarine canyons by cetaceans, particularly beaked whales (family Ziphiidae), which appear to be especially attracted to canyon habitats in some areas. However, not all submarine canyons are associated with large numbers of cetaceans and the mechanisms through which submarine canyons may attract cetaceans are not clearly understood. This paper reviews some of the cetacean associations with submarine canyons that have been anecdotally described or presented in scientific literature and discusses the physical, oceanographic and biological mechanisms that may lead to enhanced cetacean abundance around these canyons. Particular attention is paid to the Gully, a large submarine canyon and Marine Protected Area off eastern Canada for which there exists some of the strongest evidence available for submarine canyons as important cetacean habitat. Studies demonstrating increased cetacean abundance in the Gully and the processes that are likely to attract cetaceans to this relatively well-studied canyon are discussed. This review provides some limited evidence that cetaceans are more likely to associate with larger canyons; however, further studies are needed to fully understand the relationship between the physical characteristics of canyons and enhanced cetacean abundance. In general, toothed whales (especially beaked whales and sperm whales) appear to exhibit the strongest associations with submarine canyons, occurring in these features throughout the year and likely attracted by concentrating and aggregating processes. By contrast, baleen whales tend to occur in canyons seasonally and are most likely attracted to canyons by enrichment and concentrating processes. Existing evidence thus suggests that at least some submarine canyons are important foraging areas for cetaceans, and should be given special consideration for cetacean conservation and protection."

Submarine canyons; Cetology; Ecological associations; Scotian Shelf; Gully Marine Protected Area

10.1016/j.dsr2.2013.12.016

Funding was provided by the Natural Sciences and Engineering Research Council of Canada's CGS-D Scholarship program, the Department of Biology and Faculty of Graduate Studies at Dalhousie University, and the Dr. Patrick F. Lett Graduate Students' Assistance Bursary.

Presented at the 1st International Symposium on Submarine Canyons (INCISE 1), held at IFREMER, Brest, France, Summer 2012

Natural Sciences and Engineering Research Council of Canada's CGS-D Scholarship

Dalhousie University

the Dr. Patrick F. Lett Graduate Students' Assistance Bursary