Variability of the microbial community in the western Antarctic Peninsula from late fall to spring during a low ice cover year
Although winter conditions play a major role in determining the productivity of the western Antarctic Peninsula (WAP) waters for the following spring and summer, a few studies have dealt with the seasonal variability of microorganisms in the WAP in winter. Moreover, because of regional warming, sea-...
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ftunivlouvain:oai:dial.uclouvain.be:boreal:122123 2024-05-19T07:30:40+00:00 Variability of the microbial community in the western Antarctic Peninsula from late fall to spring during a low ice cover year Moreau, Sébastien Ferreyra, Gustavo A. Mercier, Bernard Lemarchand, Karine Lionard, Marie Roy, Suzanne Mostajir, Behzad Roy, Sébastien van Hardenberg, Bon Demers, Serge UCL - Autre 2010 http://hdl.handle.net/2078/122123 https://doi.org/10.1007/s00300-010-0806-z eng eng boreal:122123 http://hdl.handle.net/2078/122123 doi:10.1007/s00300-010-0806-z urn:ISSN:0722-4060 Polar Biology, Vol. 33, no. 12, p. 1599-1614 (2010) Sea ice Microbial food web Antarctic Peninsula UV radiations info:eu-repo/semantics/article 2010 ftunivlouvain https://doi.org/10.1007/s00300-010-0806-z 2024-04-24T01:39:46Z Although winter conditions play a major role in determining the productivity of the western Antarctic Peninsula (WAP) waters for the following spring and summer, a few studies have dealt with the seasonal variability of microorganisms in the WAP in winter. Moreover, because of regional warming, sea-ice retreat is happening earlier in spring, at the onset of the production season. In this context, this study describes the dynamics of the marine microbial community in the Melchior Archipelago (WAP) from fall to spring 2006. Samples were collected monthly to biweekly at four depths from the surface to the aphotic layer. The abundance and carbon content of bacteria, phytoplankton and microzooplankton were analyzed using flow cytometry and inverted microscopy, and bacterial richness was examined by PCR-DGGE. As expected, due to the extreme environmental conditions, the microbial community abundance and biomass were low in fall and winter. Bacterial abundance ranged from 1.2 to 2.8 × 10 5 cells ml -1 showing a slight increase in spring. Phytoplankton biomass was low and dominated by small cells (<2 μm) in fall and winter (average chlorophyll a concentration, Chl-a, of, respectively, 0.3 and 0.13 μg l -1). Phytoplankton biomass increased in spring (Chl-a up to 1.13 μg l -1), and, despite potentially adequate growth conditions, this rise was small and phytoplankton was still dominated by small cells (2-20 μm). In addition, the early disappearing of sea-ice in spring 2006 let the surface water exposed to ultraviolet B radiations (UVBR, 280-320 nm), which seemed to have a negative impact on the microbial community in surface waters. © 2010 Springer-Verlag. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Polar Biology Sea ice DIAL@UCLouvain (Université catholique de Louvain) Polar Biology 33 12 1599 1614 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
Sea ice Microbial food web Antarctic Peninsula UV radiations |
spellingShingle |
Sea ice Microbial food web Antarctic Peninsula UV radiations Moreau, Sébastien Ferreyra, Gustavo A. Mercier, Bernard Lemarchand, Karine Lionard, Marie Roy, Suzanne Mostajir, Behzad Roy, Sébastien van Hardenberg, Bon Demers, Serge Variability of the microbial community in the western Antarctic Peninsula from late fall to spring during a low ice cover year |
topic_facet |
Sea ice Microbial food web Antarctic Peninsula UV radiations |
description |
Although winter conditions play a major role in determining the productivity of the western Antarctic Peninsula (WAP) waters for the following spring and summer, a few studies have dealt with the seasonal variability of microorganisms in the WAP in winter. Moreover, because of regional warming, sea-ice retreat is happening earlier in spring, at the onset of the production season. In this context, this study describes the dynamics of the marine microbial community in the Melchior Archipelago (WAP) from fall to spring 2006. Samples were collected monthly to biweekly at four depths from the surface to the aphotic layer. The abundance and carbon content of bacteria, phytoplankton and microzooplankton were analyzed using flow cytometry and inverted microscopy, and bacterial richness was examined by PCR-DGGE. As expected, due to the extreme environmental conditions, the microbial community abundance and biomass were low in fall and winter. Bacterial abundance ranged from 1.2 to 2.8 × 10 5 cells ml -1 showing a slight increase in spring. Phytoplankton biomass was low and dominated by small cells (<2 μm) in fall and winter (average chlorophyll a concentration, Chl-a, of, respectively, 0.3 and 0.13 μg l -1). Phytoplankton biomass increased in spring (Chl-a up to 1.13 μg l -1), and, despite potentially adequate growth conditions, this rise was small and phytoplankton was still dominated by small cells (2-20 μm). In addition, the early disappearing of sea-ice in spring 2006 let the surface water exposed to ultraviolet B radiations (UVBR, 280-320 nm), which seemed to have a negative impact on the microbial community in surface waters. © 2010 Springer-Verlag. |
author2 |
UCL - Autre |
format |
Article in Journal/Newspaper |
author |
Moreau, Sébastien Ferreyra, Gustavo A. Mercier, Bernard Lemarchand, Karine Lionard, Marie Roy, Suzanne Mostajir, Behzad Roy, Sébastien van Hardenberg, Bon Demers, Serge |
author_facet |
Moreau, Sébastien Ferreyra, Gustavo A. Mercier, Bernard Lemarchand, Karine Lionard, Marie Roy, Suzanne Mostajir, Behzad Roy, Sébastien van Hardenberg, Bon Demers, Serge |
author_sort |
Moreau, Sébastien |
title |
Variability of the microbial community in the western Antarctic Peninsula from late fall to spring during a low ice cover year |
title_short |
Variability of the microbial community in the western Antarctic Peninsula from late fall to spring during a low ice cover year |
title_full |
Variability of the microbial community in the western Antarctic Peninsula from late fall to spring during a low ice cover year |
title_fullStr |
Variability of the microbial community in the western Antarctic Peninsula from late fall to spring during a low ice cover year |
title_full_unstemmed |
Variability of the microbial community in the western Antarctic Peninsula from late fall to spring during a low ice cover year |
title_sort |
variability of the microbial community in the western antarctic peninsula from late fall to spring during a low ice cover year |
publishDate |
2010 |
url |
http://hdl.handle.net/2078/122123 https://doi.org/10.1007/s00300-010-0806-z |
genre |
Antarc* Antarctic Antarctic Peninsula Polar Biology Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Polar Biology Sea ice |
op_source |
Polar Biology, Vol. 33, no. 12, p. 1599-1614 (2010) |
op_relation |
boreal:122123 http://hdl.handle.net/2078/122123 doi:10.1007/s00300-010-0806-z urn:ISSN:0722-4060 |
op_doi |
https://doi.org/10.1007/s00300-010-0806-z |
container_title |
Polar Biology |
container_volume |
33 |
container_issue |
12 |
container_start_page |
1599 |
op_container_end_page |
1614 |
_version_ |
1799488400926965760 |