Abstract
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.
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Acknowledgments
This work was supported by the Carlsberg Foundation, Greenland Climate Research Center (Grant Number 6505), Selskabet for Arktisk Forskning og Teknologi, Knud Højgårds Fond, the Oticon Foundation, the Danish Council for Strategic Research (North Atlantic–Arctic coupling in a changing climate: impacts on ocean circulation, carbon cycling and sea-ice, grant number 10-093003/DSF], Center for Macroecology, Evolution and Climate supported by the Danish National Research Foundation and Deptartment of Biology (University of Copenhagen). Fieldwork took place at Arctic Station (Qerqertarsuaq, University of Copenhagen), and the authors thank Ole Stecher and the crew of RV Porsild for help during sampling. Also thanks to Abel Brandt and Johannes Mølgaard, for their hard work and knowledge on local conditions. Berit Langkilde Møller is thanked for performing the HPLC analysis, Simon Wright for supplying the CHEMTAX software and Louise Schlüter for assistance using CHEMTAX.
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Sørensen, N., Daugbjerg, N., Richardson, K. et al. Succession of picophytoplankton during the spring bloom 2012 in Disko Bay (West Greenland)—an unexpectedly low abundance of green algae. Polar Biol 40, 463–469 (2017). https://doi.org/10.1007/s00300-016-1952-8
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DOI: https://doi.org/10.1007/s00300-016-1952-8