Relative summer abundances and distribution of Pseudocalanus spp. (Copepoda: Calanoida) adults in relation to environmental variables in the Nordic Seas and Svalbard fjords

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• 作者：Ole Nicolai Staurland Aarbakke ; Svein-Erik Fevolden ; Agata Weydmann
• 关键词：Zooplankton ; Pseudocalanus ; Biogeography ; Arctic
• 刊名：Polar Biology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：40
• 期：1
• 页码：51-59
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Ecology; Oceanography; Microbiology; Plant Sciences; Zoology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-2056
• 卷排序：40

文摘

North Atlantic average sea surface temperatures have increased since the 1970s, and how the marine environment is responding to the temperature increase is of considerable interest. Several zooplankton taxa have been reported to have undergone shifts in distributional ranges driven by climate change. We present a study on interannual variability of adult Pseudocalanus spp. from the Norwegian Sea and two fjords of Spitsbergen, collected between 2003 and 2009. Species are identified based on the combination of morphological features and molecular methods (mitochondrial cytochrome oxidase I gene, COI and nuclear internal transcribed spacer 1, ITS 1 sequences). Based on multivariate statistics, our observations suggest that Pseudocalanus species differ markedly in their environmental preferences; three species appear to be oceanic: P. elongatus is associated with relatively high temperatures and shares domain with P. minutus, P. moultoni tolerates a wide range of temperatures and is widely distributed, while P. acuspes is a coastal/shelf species that is strongly associated with cold and less saline waters. We conclude that with a climate change and increasing sea water temperatures, P. elongatus is likely to shift its distribution northward; for P. acuspes, it may result in smaller populations in the future; while P. minutus and P. moultoni may not be affected.