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Vertical segregation within four grazing copepods in the Oyashio region during early spring

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タイトル: Vertical segregation within four grazing copepods in the Oyashio region during early spring
著者: Sato, Ken-Ichi 著作を一覧する
Yamaguchi, Atsushi 著作を一覧する
Ueno, Hiromichi 著作を一覧する
Ikeda, Tsutomu 著作を一覧する
キーワード: diel vertical migration
gut content
habitat separation
ontogenetic vertical migration
Neocalanus
発行日: 2011年 8月
出版者: Oxford University Press
誌名: Journal of Plankton Research
巻: 33
号: 8
開始ページ: 1230
終了ページ: 1238
出版社 DOI: 10.1093/plankt/fbr018
抄録: Fine-scale vertical distribution patterns of Neocalanus flemingeri, Neocalanus cristatus, Eucalanus bungii and Metridia pacifica were studied by stratified sampling (9 strata between 0 and 1000 m) with a vertical multiple plankton sampler (VMPS) every 3 h for 24 h during 21-22 March 2005 in the Oyashio region. Most C1-C5 stages of N. flemingeri and N. cristatus occurred in the 30-90 m and 70-200 m strata, respectively, both day and night. Irrespective of day and night, C3-C6 E. bungii were distributed broadly in the 200-430 m stratum (C5 inhabiting the shallowest layer). Thus, these three copepods exhibited vertical partitioning of their habitats in the upper layers. The C1-C6 of M. pacifica were distributed broadly from 140 to 400 m during daytime and migrated up to the 100-180 m layer at night (except for non-migrant C1 and C6 males). The within-species zonation of copepodid stages was less marked, but older stages tended to occupy deeper zones (N. flemingeri, N. cristatus and M. pacifica) or shallower zones (E. bungii). Gut content analyses of N. flemingeri and N. cristatus revealed the predominance of diatoms in both species, but the proportion of broken cells was greater in the deep-dwelling N. cristatus than in the shallow-dwelling N. flemingeri, suggesting the importance of sinking phytoplankton aggregates as food source for the former species.
Rights: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Journal of Plankton Research following peer review. The definitive publisher-authenticated version J. Plankton Res. (2011) 33 (8): 1230-1238 is available online at: http://plankt.oxfordjournals.org/content/33/8/1230
Relation (URI): http://plankt.oxfordjournals.org/content/33/8/1230
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/48558
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 山口 篤

 

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