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Habitat use by North Pacific right whales, Eubalaena japonica, in the Bering Sea and Gulf of Alaska

The small population of North Pacific right whales, found during the summer in Alaska waters, is one of the most critically endangered whale populations in the world. Commercial whaling in the 1800s has now left us with only a few dozens. Recently these whales have been recognized as a different species from right whales seen in the North Atlantic and others in the Southern Hemisphere.

To help define areas and ecological parameters critical to the survival of this remnant population of right whales, habitat use was investigated by scientists at the NOAA National Marine Fisheries Service's, National Marine Mammal Laboratory, in Seattle, Washington by examining all available sighting and catch records in the southeastern Bering Sea and Gulf of Alaska over the past two centuries. These results were published recently in the journal Mammal Review.

Based on re-analyses of whaling records and surveys, important areas appeared to be (1) the Southeastern Bering Sea slope and shelf, (2) eastern Aleutian Islands, and (3) Gulf of Alaska slope and abyssal plain. Since 1980, the only area where right whales have been seen consistently is on the middle-shelf of the Southeastern Bering Sea. However, acoustic detections and single sightings have been reported in most other regions. In fact, the results of this study refute conclusions in another study that a "habitat shift" occurred when right whales moved from deep continental slope waters in the SEBS during the 1940s to 1960s to now occupy "a different habitat" on the middle-shelf of the SEBS. Given that right whales have been seen in middle-shelf waters from the 19th century to the present, it appears that the SEBS middle shelf was and continues to be important habitat for this species. Although there has been a conspicuous absence of right whale sightings from the outer shelf and slope habitat in recent years, this may be due, at least in part, to a lack of survey effort there. Results of acoustic recorder deploy
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Source:Blackwell Publishing Ltd.


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