Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data

Tokuhiro, Koki; Abe, Yoshiyuki; Matsuno, Kohei; Onodera, Jonaotaro; Fujiwara, Amane; Harada, Naomi; Hirawake, Toru; Yamaguchi, Atsushi

Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data

Tokuhiro, Koki; Abe, Yoshiyuki; Matsuno, Kohei et al.

Polar Science, 2019, 19, 94-111

Permalink : https://hdl.handle.net/2115/80535

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アクセス権	open access
URI	https://hdl.handle.net/2115/80535
タイトル	Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data
著者	Tokuhiro, Koki ; Abe, Yoshiyuki ; Matsuno, Kohei ; Onodera, Jonaotaro ; Fujiwara, Amane ; Harada, Naomi ; Hirawake, Toru ; Yamaguchi, Atsushi
著者名 Tokuhiro, Koki
著者名 Abe, Yoshiyuki
e-Rad_Researcher 90712159 著者名 Matsuno, Kohei
著者名 Onodera, Jonaotaro
著者名 Fujiwara, Amane
e-Rad_Researcher 70344281 著者名 Harada, Naomi
e-Rad_Researcher 70311165 著者名 Hirawake, Toru
e-Rad_Researcher 50344495 著者名 Yamaguchi, Atsushi
言語	英語
キーワード	Generalized additive models
	Calanus hyperboreus
	Metridia longa
	Paraeuchaeta glacialis
	Heterorhabdus norvegicus
発行日	2019-03
出版者	Elsevier
収録物名	Polar Science
巻(号)	19
ページ	94-111
抄録	In recent years, marine ecosystems have changed due to the drastic sea ice reduction in the Arctic Ocean, but the relationship between copepod phenology and environmental drivers is unclear. To reveal the relationship, seasonal changes in the flux (abundance of swimmers), population structure, lipid accumulation and gonad maturation of four dominant copepods (Calanus hyperboreus, Metridia longa, Paraeuchaeta glacialis and Heterorhabdus norvegicus) were studied using a sediment trap deployed at a depth of 222 m in the Pacific-Arctic sector from October 2010 to September 2013. C. hyperboreus, mostly comprising copepodid stage 6 females (C6F), exhibited several peaks in flux in spring and autumn. C. hyperboreus C6Fs were dominated by lipid-rich specimens year-round, and gonad development was observed in these samples from February to April. The M. longa flux showed no clear seasonality. Gonad maturation of M. longa C6Fs occurred from February to September. P. glacialis flux exhibited two peaks in autumn of 2011 and 2012. In contrast to the former two species, lipid-rich, mature P. glacialis C6Fs occurred year-round. H. norvegicus copepodid stage 6 males (C6Ms) also occurred throughout the year, likely because H. norvegicus has functional feeding appendages, even in C6Ms. From generalized additive models, C. hyperboreus, M. longa and P. glacialis showed relationships with daytime length and/or sea ice concentrations, but the relationship patterns were different. These findings suggest that the response (e.g., vertical migration) to the environmental parameters could vary with species and the drastic sea ice reductions may affect the copepod phenology in the Pacific-Arctic sector.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	© 2019, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	1873-9652
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.polar.2018.08.006