Succession of picophytoplankton during the spring bloom 2012 in Disko Bay (West Greenland)—an unexpectedly low abundance of green algae
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- 作者：Nikolaj Sørensen ; Niels Daugbjerg ; Katherine Richardson…
- 关键词：CHEMTAX ; GC content ; HPLC ; Picoeukaryotes ; 19′-hex ; fucoxanthin ; Real ; time qPCR
- 刊名：Polar Biology
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：40
- 期：2
- 页码：463-469
- 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
Picoplankton are an ecologically important component of pelagic Arctic marine ecosystems that may be heavily impacted by climate change. In order to assess potential impacts of a changing environment on this group, it is necessary to develop a better understanding of their population dynamics and seasonal distribution. This study, carried out in Disko Bay, West Greenland, during spring 2012, demonstrates that fuco-algae (e.g. chrysophytes, cryptophytes, diatoms and pelagophytes) dominated the picophytoplankton during the spring bloom with minor contributions from haptophytes. In the post-bloom phase, fuco-algae were replaced by haptophytes. In contrast to total chlorophyll a, which varied dramatically over the study period, the picoplanktonic chlorophyll a remained relatively stable despite the variability in picophytoplankton community composition. Based on mostly molecular studies, a general picture has emerged from the literature that mamiellophytes (a group within the green algae) dominate Arctic picophytoplankton. Here, however, green algae were found to contribute with only about 10 % of the picoplanktonic chlorophyll a. We suggest here that differences in cell size may offer a plausible explanation for the contrast between results obtained from molecular studies and those obtained from pigment- and microscopy-based studies.