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- W2323843580 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 491:221-234 (2013) - DOI: https://doi.org/10.3354/meps10445 Interannual variation in diets of walleye pollock in the Doto area, in relation to climate variation Orio Yamamura1,*, Tetsuichiro Funamoto1, Masayuki Chimura1, Satoshi Honda2, Tatsuki Oshima3 1Hokkaido National Fisheries Research Institute, Fisheries Research Agency, Kushiro 085-0802, Japan 2National Research Institute of Fisheries Science, Fisheries Research Agency, Yokohama 236-8648, Japan 3Marine Fisheries Research and Development Center, Fisheries Research Agency, Yokohama 220-6115, Japan *Email: orioy@affrc.go.jp ABSTRACT: Interannual variation in the diet of walleye pollock Theragra chalcogramma along the southeastern coast of Hokkaido Island (Doto area) was analyzed using >15000 specimens collected in the periods 1989-1992 and 1995-2011, in relation to oceanographic variables. The area experienced a warm period from 1998 to 2002, which was preceded and followed by cold periods. An apparent shift in diet occurred between the first cold period and the warm period. Appendicularians (larvaceans) became an important summer prey for small-sized pollock (≤300 mm SL) in addition to copepods and euphausiids, which were also important before the onset of the warm period. In medium- and large-sized pollock, an abrupt decrease in mesopelagic fishes (mainly myctophid Diaphus theta) was observed in stomach contents 3 yr after the 1997/1998 climate regime shift, possibly reflecting a recruitment failure of D. theta. Appendicularians, cannibalism and anchovy Engraulis japonica compensated for the disappearance of mesopelagic fishes from the diet. During autumn and winter, a similar shift from micronekton (mainly D. theta and firefly squid Watasenia scintillans) to euphausiids (exclusively Euphausia pacifica) and cannibalism was found between 2000 and 2001. Although diet changes lagged the onset of the warm period, condition factor increased immediately after the regime shift. This inconsistency may be attributable to the bioenergetic response of juvenile pollock, which attain better growth at warmer temperatures. Thus, in the Doto area, the effect of climate variation on the survival of pollock seemed to be limited, due to their flexible feeding behaviors. KEY WORDS: Diet shift · Climate variation · Cannibalism · Appendicularians · Diaphus theta Full text in pdf format PreviousNextCite this article as: Yamamura O, Funamoto T, Chimura M, Honda S, Oshima T (2013) Interannual variation in diets of walleye pollock in the Doto area, in relation to climate variation. Mar Ecol Prog Ser 491:221-234. https://doi.org/10.3354/meps10445 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 491. Online publication date: October 02, 2013 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2013 Inter-Research." @default.
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