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Workshop 3 (BIO Topic)
Integrating marine mammal populations and rates of prey consumption in models and forecasts of climate change-ecosystem change in the North Pacific and North Atlantic Oceans

Co-Sponsored by ICES

Co-Convenors: Hidehiro Kato (Japan), Begoña Santos (ICES, Spain) and William J. Sydeman (U.S.A.)

In many marine ecosystems from tropical to arctic waters, marine mammals are showing considerable changes in abundance. In general, cetaceans, recovering from historical exploitation, are increasing, whereas some pinniped species are declining regionally, while others are increasing. Models of marine mammal prey consumption indicate that ~20-60% of secondary production may be taken by these top consumers. Therefore, marine mammals may exert «top-down» control on food webs, as well as functioning as competitors to fish, seabirds, and humans for mid-trophic level food resources. One of the goals of PICES and ICES science is to enhance forecasts of ecosystem change attributable to climate and anthropogenic forcings. Given this goal, the workshop will review and assess rates of marine mammal population and prey consumption changes in the North Pacific and North Atlantic. Presentations are invited on changes in marine mammal abundance, distribution, diet, and prey consumption. Discussion will focus on how to best integrate this information into models of ecosystem dynamics, with and without climate change and fishing impacts.

October 27, 2009

Andrew W. Trites (Invited)
Marine mammals in multi-species models: Assumptions, limitations and theoretical considerations (W3-5652)


Frank A. Parrish
Top-down pressure of foraging monk seals on subphotic fish communities; a possible symptom of a marine mammal population at carrying capacity (W3-5511)
(pdf, 2.4 Mb)


Rolf Ream and Lowell Fritz
Pinniped population changes in the North Pacific: Recent trends in northern fur seal and Steller sea lion abundance (W3-5964)
(pdf, 9 Mb, by request)


M. Begoña Santos and Graham J. Pierce (Invited)
Integrating marine mammal populations and rates of prey consumption in models and forecasts of climate change-ecosystem change in the North Atlantic Ocean (W3-5779)
(pdf, 3 Mb)


Hiroshi Okamura, Hiroshi Nagashima, and Shiroh Yonezaki (Invited)
Quantitative assessment of impacts on the sandlance population by consumption of minke whales (W3-5771)


Hiroto Murase, Tsutomu Tamura, Tatsuya Isoda, Ryosuke Okamoto, Hidehiro Kato, Shiroh Yonezaki, Hikaru Watanabe, Naoki Tojo, Ryuichi Matsukura, Kazushi Miyashita, Hiroshi Kiwada, Koji Matsuoka, Sigetoshi Nishiwaki, Denzo Inagake, Makoto Okazaki, Hiroshi Okamura, Yoshihiro Fujise and Shigeyuki Kawahara
Prey preferences of common minke (Balaenoptera acutorostrata), Bryde’s (B. edeni) and
sei (B. borealis) whales in the western North Pacific (W3-5724)
(pdf, 1.3 Mb)


Jarrod A. Santora, William J. Sydeman and Christian S. Reiss
Of whales and krill: Investigating the patch dynamics between foraging whales and krill (W3-5725)


Valeriy I. Fadeev
Benthos and food supply studies in feeding grounds of the Okhotsk-Korean gray whale population off the northeast coast of Sakhalin Island (Russia), 2004-2008 (W3-5718)
(pdf, 2.8 Mb)


Kyung-Jun Song, Zang Geun Kim, Seok-Gwan Choi, Yong-Rock An and Chang Ik Zhang
Stomach contents of bycaught minke whales (Balaenoptera acutorostrata) in Korean waters

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