Transition from a mixotrophic/heterotrophic protist community during the dark winter to a photoautotrophic spring community in surface waters of Disko Bay, Greenland
Unicellular eukaryotic plankton communities (protists) are the major basis of the marine food web. The spring bloom is especially important, because of its high biomass. However, it is poorly described how the protist community composition in Arctic surface waters develops from winter to spring. We...
Published in: | Frontiers in Microbiology |
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Online Access: | http://dx.doi.org/10.3389/fmicb.2024.1407888 https://www.frontiersin.org/articles/10.3389/fmicb.2024.1407888/full |
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crfrontiers:10.3389/fmicb.2024.1407888 2024-06-23T07:50:31+00:00 Transition from a mixotrophic/heterotrophic protist community during the dark winter to a photoautotrophic spring community in surface waters of Disko Bay, Greenland Bruhn, Claudia Sabine Lundholm, Nina Hansen, Per Juel Wohlrab, Sylke John, Uwe 2024 http://dx.doi.org/10.3389/fmicb.2024.1407888 https://www.frontiersin.org/articles/10.3389/fmicb.2024.1407888/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Microbiology volume 15 ISSN 1664-302X journal-article 2024 crfrontiers https://doi.org/10.3389/fmicb.2024.1407888 2024-06-11T04:09:14Z Unicellular eukaryotic plankton communities (protists) are the major basis of the marine food web. The spring bloom is especially important, because of its high biomass. However, it is poorly described how the protist community composition in Arctic surface waters develops from winter to spring. We show that mixotrophic and parasitic organisms are prominent in the dark winter period. The transition period toward the spring bloom event was characterized by a high relative abundance of mixotrophic dinoflagellates, while centric diatoms and the haptophyte Phaeocystis pouchetii dominated the successive phototrophic spring bloom event during the study. The data shows a continuous community shift from winter to spring, and not just a dormant spring community waiting for the right environmental conditions. The spring bloom initiation commenced while sea ice was still scattering and absorbing the sunlight, inhibiting its penetration into the water column. The initial increase in fluorescence was detected relatively deep in the water column at ~55 m depth at the halocline, at which the photosynthetic cells accumulated, while a thick layer of snow and sea ice was still obstructing sunlight penetration of the surface water. This suggests that water column stratification and a complex interplay of abiotic factors eventually promote the spring bloom initiation. Article in Journal/Newspaper Arctic Disko Bay Greenland Sea ice Frontiers (Publisher) Arctic Greenland Frontiers in Microbiology 15 |
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Frontiers (Publisher) |
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description |
Unicellular eukaryotic plankton communities (protists) are the major basis of the marine food web. The spring bloom is especially important, because of its high biomass. However, it is poorly described how the protist community composition in Arctic surface waters develops from winter to spring. We show that mixotrophic and parasitic organisms are prominent in the dark winter period. The transition period toward the spring bloom event was characterized by a high relative abundance of mixotrophic dinoflagellates, while centric diatoms and the haptophyte Phaeocystis pouchetii dominated the successive phototrophic spring bloom event during the study. The data shows a continuous community shift from winter to spring, and not just a dormant spring community waiting for the right environmental conditions. The spring bloom initiation commenced while sea ice was still scattering and absorbing the sunlight, inhibiting its penetration into the water column. The initial increase in fluorescence was detected relatively deep in the water column at ~55 m depth at the halocline, at which the photosynthetic cells accumulated, while a thick layer of snow and sea ice was still obstructing sunlight penetration of the surface water. This suggests that water column stratification and a complex interplay of abiotic factors eventually promote the spring bloom initiation. |
format |
Article in Journal/Newspaper |
author |
Bruhn, Claudia Sabine Lundholm, Nina Hansen, Per Juel Wohlrab, Sylke John, Uwe |
spellingShingle |
Bruhn, Claudia Sabine Lundholm, Nina Hansen, Per Juel Wohlrab, Sylke John, Uwe Transition from a mixotrophic/heterotrophic protist community during the dark winter to a photoautotrophic spring community in surface waters of Disko Bay, Greenland |
author_facet |
Bruhn, Claudia Sabine Lundholm, Nina Hansen, Per Juel Wohlrab, Sylke John, Uwe |
author_sort |
Bruhn, Claudia Sabine |
title |
Transition from a mixotrophic/heterotrophic protist community during the dark winter to a photoautotrophic spring community in surface waters of Disko Bay, Greenland |
title_short |
Transition from a mixotrophic/heterotrophic protist community during the dark winter to a photoautotrophic spring community in surface waters of Disko Bay, Greenland |
title_full |
Transition from a mixotrophic/heterotrophic protist community during the dark winter to a photoautotrophic spring community in surface waters of Disko Bay, Greenland |
title_fullStr |
Transition from a mixotrophic/heterotrophic protist community during the dark winter to a photoautotrophic spring community in surface waters of Disko Bay, Greenland |
title_full_unstemmed |
Transition from a mixotrophic/heterotrophic protist community during the dark winter to a photoautotrophic spring community in surface waters of Disko Bay, Greenland |
title_sort |
transition from a mixotrophic/heterotrophic protist community during the dark winter to a photoautotrophic spring community in surface waters of disko bay, greenland |
publisher |
Frontiers Media SA |
publishDate |
2024 |
url |
http://dx.doi.org/10.3389/fmicb.2024.1407888 https://www.frontiersin.org/articles/10.3389/fmicb.2024.1407888/full |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Disko Bay Greenland Sea ice |
genre_facet |
Arctic Disko Bay Greenland Sea ice |
op_source |
Frontiers in Microbiology volume 15 ISSN 1664-302X |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmicb.2024.1407888 |
container_title |
Frontiers in Microbiology |
container_volume |
15 |
_version_ |
1802641420311330816 |