Characterisation of the nematode community of a low-activity cold seep in the recently ice-shelf free Larsen B area, Eastern Antarctic Peninsula
Background: Recent climate-induced ice-shelf disintegration in the Larsen A (1995) and B (2002) areas along the Eastern Antarctic Peninsula formed a unique opportunity to assess sub-ice-shelf benthic community structure and led to the discovery of unexplored habitats, including a low-activity methan...
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ftvliz:oai:oma.vliz.be:209917 2023-05-15T13:33:15+02:00 Characterisation of the nematode community of a low-activity cold seep in the recently ice-shelf free Larsen B area, Eastern Antarctic Peninsula Hauquier, F. Ingels, J. Gutt, J. Raes, M. Vanreusel, A. 2011 application/pdf https://www.vliz.be/imisdocs/publications/228663.pdf en eng info:eu-repo/semantics/altIdentifier/wos/000292931200036 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1371/journal.pone.0022240 https://www.vliz.be/imisdocs/publications/228663.pdf info:eu-repo/semantics/openAccess %3Ci%3EPLoS+One+6%287%29%3C%2Fi%3E%3A+e22240.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1371%2Fjournal.pone.0022240%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1371%2Fjournal.pone.0022240%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2011 ftvliz https://doi.org/10.1371/journal.pone.0022240 2022-05-01T09:35:47Z Background: Recent climate-induced ice-shelf disintegration in the Larsen A (1995) and B (2002) areas along the Eastern Antarctic Peninsula formed a unique opportunity to assess sub-ice-shelf benthic community structure and led to the discovery of unexplored habitats, including a low-activity methane seep beneath the former Larsen B ice shelf. Since both limited particle sedimentation under previously permanent ice coverage and reduced cold-seep activity are likely toinfluence benthic meiofauna communities, we characterised the nematode assemblage of this low-activity cold seep and compared it with other, now seasonally ice-free, Larsen A and B stations and other Antarctic shelf areas (Weddell Sea and Drake Passage), as well as cold-seep ecosystems world-wide.Principal Findings: The nematode community at the Larsen B seep site differed significantly from other Antarctic sites in terms of dominant genera, diversity and abundance. Densities in the seep samples were high (.2000 individuals per 10 cm 2 ) and showed below-surface maxima at a sediment depth of 2–3 cm in three out of four replicates. All samples were dominated by one species of the family Monhysteridae, which was identified as a Halomonhystera species that comprised between 80 and 86% of the total community. The combination of high densities, deeper density maxima and dominance of one species is shared by many cold-seep ecosystems world-wide and suggested a possible dependence upon a chemosynthetic food source. Yet stable 13 C isotopic signals (ranging between 221.9760.86% and 224.8561.89%) were indicative of a phytoplankton-derived food source.Conclusion: The recent ice-shelf collapse and enhanced food input from surface phytoplankton blooms were responsible for the shift from oligotrophic pre-collapse conditions to a phytodetritus-based community with high densities and low diversity. The parthenogenetic reproduction of the highly dominant Halomonhystera species is rather unusual for marine nematodes and may be responsible for the successful colonisation by this single species. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Drake Passage Ice Shelf Weddell Sea Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Antarctic Antarctic Peninsula Drake Passage Weddell Weddell Sea PLoS ONE 6 7 e22240 |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
description |
Background: Recent climate-induced ice-shelf disintegration in the Larsen A (1995) and B (2002) areas along the Eastern Antarctic Peninsula formed a unique opportunity to assess sub-ice-shelf benthic community structure and led to the discovery of unexplored habitats, including a low-activity methane seep beneath the former Larsen B ice shelf. Since both limited particle sedimentation under previously permanent ice coverage and reduced cold-seep activity are likely toinfluence benthic meiofauna communities, we characterised the nematode assemblage of this low-activity cold seep and compared it with other, now seasonally ice-free, Larsen A and B stations and other Antarctic shelf areas (Weddell Sea and Drake Passage), as well as cold-seep ecosystems world-wide.Principal Findings: The nematode community at the Larsen B seep site differed significantly from other Antarctic sites in terms of dominant genera, diversity and abundance. Densities in the seep samples were high (.2000 individuals per 10 cm 2 ) and showed below-surface maxima at a sediment depth of 2–3 cm in three out of four replicates. All samples were dominated by one species of the family Monhysteridae, which was identified as a Halomonhystera species that comprised between 80 and 86% of the total community. The combination of high densities, deeper density maxima and dominance of one species is shared by many cold-seep ecosystems world-wide and suggested a possible dependence upon a chemosynthetic food source. Yet stable 13 C isotopic signals (ranging between 221.9760.86% and 224.8561.89%) were indicative of a phytoplankton-derived food source.Conclusion: The recent ice-shelf collapse and enhanced food input from surface phytoplankton blooms were responsible for the shift from oligotrophic pre-collapse conditions to a phytodetritus-based community with high densities and low diversity. The parthenogenetic reproduction of the highly dominant Halomonhystera species is rather unusual for marine nematodes and may be responsible for the successful colonisation by this single species. |
format |
Article in Journal/Newspaper |
author |
Hauquier, F. Ingels, J. Gutt, J. Raes, M. Vanreusel, A. |
spellingShingle |
Hauquier, F. Ingels, J. Gutt, J. Raes, M. Vanreusel, A. Characterisation of the nematode community of a low-activity cold seep in the recently ice-shelf free Larsen B area, Eastern Antarctic Peninsula |
author_facet |
Hauquier, F. Ingels, J. Gutt, J. Raes, M. Vanreusel, A. |
author_sort |
Hauquier, F. |
title |
Characterisation of the nematode community of a low-activity cold seep in the recently ice-shelf free Larsen B area, Eastern Antarctic Peninsula |
title_short |
Characterisation of the nematode community of a low-activity cold seep in the recently ice-shelf free Larsen B area, Eastern Antarctic Peninsula |
title_full |
Characterisation of the nematode community of a low-activity cold seep in the recently ice-shelf free Larsen B area, Eastern Antarctic Peninsula |
title_fullStr |
Characterisation of the nematode community of a low-activity cold seep in the recently ice-shelf free Larsen B area, Eastern Antarctic Peninsula |
title_full_unstemmed |
Characterisation of the nematode community of a low-activity cold seep in the recently ice-shelf free Larsen B area, Eastern Antarctic Peninsula |
title_sort |
characterisation of the nematode community of a low-activity cold seep in the recently ice-shelf free larsen b area, eastern antarctic peninsula |
publishDate |
2011 |
url |
https://www.vliz.be/imisdocs/publications/228663.pdf |
geographic |
Antarctic Antarctic Peninsula Drake Passage Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Drake Passage Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Drake Passage Ice Shelf Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Drake Passage Ice Shelf Weddell Sea |
op_source |
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op_relation |
info:eu-repo/semantics/altIdentifier/wos/000292931200036 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1371/journal.pone.0022240 https://www.vliz.be/imisdocs/publications/228663.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1371/journal.pone.0022240 |
container_title |
PLoS ONE |
container_volume |
6 |
container_issue |
7 |
container_start_page |
e22240 |
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1766040501378613248 |