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Seasonal changes in the population structure of dominant planktonic copepods collected using a sediment trap moored in the western Arctic Ocean

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Title: Seasonal changes in the population structure of dominant planktonic copepods collected using a sediment trap moored in the western Arctic Ocean
Authors: Matsuno, Kohei Browse this author →KAKEN DB
Yamaguchi, Atsushi Browse this author →KAKEN DB
Fujiwara, Amane Browse this author →KAKEN DB
Onodera, Jonaotaro Browse this author →KAKEN DB
Watanabe, Eiji Browse this author →KAKEN DB
Harada, Naomi Browse this author →KAKEN DB
Kikuchi, Takashi Browse this author →KAKEN DB
Keywords: copepods
population structure
lipid accumulation
gonad maturation
western Arctic Ocean
Issue Date: 12-Oct-2015
Publisher: Taylor & Francis
Journal Title: Journal of natural history
Volume: 49
Issue: 45-48
Start Page: 2711
End Page: 2726
Publisher DOI: 10.1080/00222933.2015.1022613
Abstract: Winter ice cover of the Arctic Ocean makes year-round zooplankton sampling by plankton net a difficult task. Therefore, the collection of copepods with a sediment trap can be a powerful tool. In the present study, we analysed the seasonal changes in the population structures of five dominant planktonic copepods (Oncaea parila, Calanus hyperboreus, Metridia longa, Paraeuchaeta glacialis and Heterorhabdus norvegicus), which were collected using a sediment trap rotated at 10-15day intervals moored at 184-260m in the Northwind Abyssal Plain (75 degrees 00N, 162 degrees 00W) of the western Arctic Ocean from October 2010 to September 2012. Oncaea parila C6F with egg sacs occurred throughout the year, and the total abundance and composition of early copepodid stages (C1-C3) had two peaks each year. Calanus hyperboreus was dominated by C6F throughout the year, and their maturation was observed during February to May. Metridia longa C6F had a clear seasonality in lipid accumulation and gonad maturation: high lipid accumulation was observed from October to February, whereas gonad maturation occurred from March to September. Paraeuchaeta glacialis C6F also showed seasonality in lipid accumulation and gonad maturation, although their seasonal patterns varied from those of M. longa: high lipid individuals were abundant from February to April and mature individuals dominated from October to November. Heterorhabdus norvegicus showed seasonal changes in population structure as well: C1, C5, and C6M dominated from April to May, November to February and August to October, respectively. The life cycle patterns of these species are compared with those reported from other areas. While the results obtained by a sediment trap are inevitably subject to collection bias (i.e. passive collection at a fixed depth), a sediment trap should be considered as a powerful tool for the evaluation of the life cycle of planktonic copepods, especially in ice-covered oceans.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Natural History on 12/10/2015, available online: http://wwww.tandfonline.com/10.1080/00222933.2015.1022613.
Type: article (author version)
URI: http://hdl.handle.net/2115/63006
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山口 篤

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