[MARMAM] New publication: Dall's porpoise distribution

Keiko Sekiguchi ksekiguc at hawaii.edu
Wed Oct 26 22:56:49 PDT 2016



My co-authors and I are pleased to announce our new publication of Dall’s
porpoise on Zoological Science.


Sachiko Suzuki, Keiko Sekiguchi, Yoko Mitani, Hiroji Onishi and Takehiko
Kamito.  2016. Distribution of Dall's porpoise, Phocoenoides dalli, in the
North Pacific and Bering Sea, based on T/S Oshoro Maru 2012 summer cruise
data.  Zoological Science 33(5):491-496. Doi:10.2108/zs150141.



Dall’s porpoise (Phocoenoides dalli) is a small toothed cetacean, widely
inhabiting the North Pacific Ocean and adjacent seas, between about 30 and
62°N; however, only limited studies of its ecology have been made in
nearshore areas. A cetacean sighting survey lasting 60 days was conducted
during the 2012 summer cruise of the T/S Oshoro Maru (Hokkaido University,
Japan) in the North Pacific Ocean and Bering Sea. Based on this data, the
distribution of Dall’s porpoises and the factors controlling it in the
pelagic habitat were investigated. A total of 808 individual Dall’s
por­poises in 166 groups were sighted during a total of 469.6 hr and 4946.6
nm observations. The cruise consisted of three legs and the average porpoise
group size was significantly larger in Leg 1. The sightings were
concentrated at water depths of less than 1000 m and near eastern Aleutian
passes. Sighting clusters were found on the 200 m isobath of the
southeastern Bering Sea continental slope. There was a peak in sightings
where the sea surface temperature (SST) was relatively cold, between 5 and
7°C. Although similar track routes were taken in Leg 1 and Leg 3, the number
of sightings per unit effort was larger in Leg 1. This difference may have
arisen from the significant rise in SST as the season progressed. Relatively
large group size found in this study might relate with prey abundance along
the Aleutian Islands.


The full article can be downloaded at http://www.bioone.org/toc/jzoo/33/5 or
e-mail me for PDF at <ksekiguc at hawaii.edu>




Keiko Sekiguchi




Keiko Sekiguchi, Ph.D.   (Cetacean Biology) 

Research Fellow, the International Christian University, Tokyo, Japan 

E-mail:  <mailto:ksekiguc at hawaii.edu> <ksekiguc at hawaii.edu> 



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