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Timing of sea ice retreat can alter phytoplankton community structure in the western Arctic Ocean

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Title: Timing of sea ice retreat can alter phytoplankton community structure in the western Arctic Ocean
Authors: Fujiwara, A. Browse this author
Hirawake, T. Browse this author →KAKEN DB
Suzuki, K. Browse this author
Imai, I. Browse this author
Saitoh, S. -I. Browse this author
Issue Date: 19-Jun-2014
Publisher: Copernicus Gesellschaft
Journal Title: Biogeosciences
Volume: 11
Issue: 7
Start Page: 1705
End Page: 1716
Publisher DOI: 10.5194/bg-11-1705-2014
Abstract: This study assesses the response of phytoplankton assemblages to recent climate change, especially with regard to the shrinking of sea ice in the northern Chukchi Sea of the western Arctic Ocean. Distribution patterns of phytoplankton groups in the late summers of 2008-2010 were analysed based on HPLC pigment signatures and, the following four major algal groups were inferred via multiple regression and cluster analyses: prasinophytes, diatoms, haptophytes and dinoflagellates. A remarkable interannual difference in the distribution pattern of the groups was found in the northern basin area. Haptophytes dominated and dispersed widely in warm surface waters in 2008, whereas prasinophytes dominated in cold water in 2009 and 2010. A difference in the onset date of sea ice retreat was evident among years-the sea ice retreat in 2008 was 1-2 months earlier than in 2009 and 2010. The spatial distribution of early sea ice retreat matched the areas in which a shift in algal community composition was observed. Steel-Dwass's multiple comparison tests were used to assess the physical, chemical and biological parameters of the four clusters. We found a statistically significant difference in temperature between the haptophyte-dominated cluster and the other clusters, suggesting that the change in the phytoplankton communities was related to the earlier sea ice retreat in 2008 and the corollary increase in sea surface temperatures. Longer periods of open water during the summer, which are expected in the future, may affect food webs and biogeochemical cycles in the western Arctic due to shifts in phytoplankton community structure.
Type: article
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: 齊藤 誠一

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