Impacts of unusually high sea ice cover on Antarctic coastal benthic food web structure
Antarctica currently undergoes strong and contrasted impacts linked with climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice cover decrease, the sea ice cover of East Antarctica unexpectedly tends to increase, possibly in r...
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ftorbi:oai:orbi.ulg.ac.be:2268/195134 2024-04-21T07:52:29+00:00 Impacts of unusually high sea ice cover on Antarctic coastal benthic food web structure Michel, Loïc Dubois, Philippe Eleaume, Marc Fournier, Jérôme Gallut, Cyril Jane, Philip Lepoint, Gilles MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège 2016-04-08 https://orbi.uliege.be/handle/2268/195134 https://orbi.uliege.be/bitstream/2268/195134/1/Michel_IsoEcol2016.pdf en eng http://isoecol.com/2016/ https://orbi.uliege.be/handle/2268/195134 info:hdl:2268/195134 https://orbi.uliege.be/bitstream/2268/195134/1/Michel_IsoEcol2016.pdf open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess 10th International Conference on the Applications of Stable Isotope Techniques to Ecological Studies (IsoEcol 2016), Tokyo, Japan [JP], 03-08/04/2016 stable isotope antarctica food web mixing model benthic invertebrates trophic marker Life sciences Aquatic sciences & oceanology Environmental sciences & ecology Zoology Sciences du vivant Sciences aquatiques & océanologie Sciences de l’environnement & écologie Zoologie conference paper not in proceedings http://purl.org/coar/resource_type/c_18cp info:eu-repo/semantics/conferencePaper 2016 ftorbi 2024-03-27T14:57:31Z Antarctica currently undergoes strong and contrasted impacts linked with climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice cover decrease, the sea ice cover of East Antarctica unexpectedly tends to increase, possibly in relation with changes in atmospheric circulation. Changes in sea ice cover are likely to influence benthic food web structure through modifications of benthic-pelagic coupling, disruption of benthic production and/or modifications of benthic community structure (i.e. resource availability for benthic consumers). Here, we studied shallow (0-20 m) benthic food web structure on the coasts of Petrels Island (Adélie Land, East Antarctica) during an event of unusually high spatial and temporal (two successive austral summers without seasonal break-up) sea ice cover. Using stable isotope ratios of C, N and S and the SIAR mixing model, we examined importance of several organic matter sources (benthic macroalgae, benthic biofilm, sympagic algae, suspended particulate organic matter and penguin guano) for nutrition of over 20 taxa of benthic invertebrates (sponges, sea anemones, nemerteans, sessile and mobile polychaetes, gastropods, bivalves, sipunculids, pycnogonids, amphipods, sea stars, sea urchins and sea cucumbers) spanning most present functional guilds. Our results provide insights about how Antarctic benthic consumers, which have evolved in an extremely stable environment, might adapt their feeding habits in response to sudden man-driven changes in environmental conditions and trophic resource availability. Conference Object Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Sea ice University of Liège: ORBi (Open Repository and Bibliography) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
stable isotope antarctica food web mixing model benthic invertebrates trophic marker Life sciences Aquatic sciences & oceanology Environmental sciences & ecology Zoology Sciences du vivant Sciences aquatiques & océanologie Sciences de l’environnement & écologie Zoologie |
spellingShingle |
stable isotope antarctica food web mixing model benthic invertebrates trophic marker Life sciences Aquatic sciences & oceanology Environmental sciences & ecology Zoology Sciences du vivant Sciences aquatiques & océanologie Sciences de l’environnement & écologie Zoologie Michel, Loïc Dubois, Philippe Eleaume, Marc Fournier, Jérôme Gallut, Cyril Jane, Philip Lepoint, Gilles Impacts of unusually high sea ice cover on Antarctic coastal benthic food web structure |
topic_facet |
stable isotope antarctica food web mixing model benthic invertebrates trophic marker Life sciences Aquatic sciences & oceanology Environmental sciences & ecology Zoology Sciences du vivant Sciences aquatiques & océanologie Sciences de l’environnement & écologie Zoologie |
description |
Antarctica currently undergoes strong and contrasted impacts linked with climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice cover decrease, the sea ice cover of East Antarctica unexpectedly tends to increase, possibly in relation with changes in atmospheric circulation. Changes in sea ice cover are likely to influence benthic food web structure through modifications of benthic-pelagic coupling, disruption of benthic production and/or modifications of benthic community structure (i.e. resource availability for benthic consumers). Here, we studied shallow (0-20 m) benthic food web structure on the coasts of Petrels Island (Adélie Land, East Antarctica) during an event of unusually high spatial and temporal (two successive austral summers without seasonal break-up) sea ice cover. Using stable isotope ratios of C, N and S and the SIAR mixing model, we examined importance of several organic matter sources (benthic macroalgae, benthic biofilm, sympagic algae, suspended particulate organic matter and penguin guano) for nutrition of over 20 taxa of benthic invertebrates (sponges, sea anemones, nemerteans, sessile and mobile polychaetes, gastropods, bivalves, sipunculids, pycnogonids, amphipods, sea stars, sea urchins and sea cucumbers) spanning most present functional guilds. Our results provide insights about how Antarctic benthic consumers, which have evolved in an extremely stable environment, might adapt their feeding habits in response to sudden man-driven changes in environmental conditions and trophic resource availability. |
author2 |
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège |
format |
Conference Object |
author |
Michel, Loïc Dubois, Philippe Eleaume, Marc Fournier, Jérôme Gallut, Cyril Jane, Philip Lepoint, Gilles |
author_facet |
Michel, Loïc Dubois, Philippe Eleaume, Marc Fournier, Jérôme Gallut, Cyril Jane, Philip Lepoint, Gilles |
author_sort |
Michel, Loïc |
title |
Impacts of unusually high sea ice cover on Antarctic coastal benthic food web structure |
title_short |
Impacts of unusually high sea ice cover on Antarctic coastal benthic food web structure |
title_full |
Impacts of unusually high sea ice cover on Antarctic coastal benthic food web structure |
title_fullStr |
Impacts of unusually high sea ice cover on Antarctic coastal benthic food web structure |
title_full_unstemmed |
Impacts of unusually high sea ice cover on Antarctic coastal benthic food web structure |
title_sort |
impacts of unusually high sea ice cover on antarctic coastal benthic food web structure |
publishDate |
2016 |
url |
https://orbi.uliege.be/handle/2268/195134 https://orbi.uliege.be/bitstream/2268/195134/1/Michel_IsoEcol2016.pdf |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Sea ice |
op_source |
10th International Conference on the Applications of Stable Isotope Techniques to Ecological Studies (IsoEcol 2016), Tokyo, Japan [JP], 03-08/04/2016 |
op_relation |
http://isoecol.com/2016/ https://orbi.uliege.be/handle/2268/195134 info:hdl:2268/195134 https://orbi.uliege.be/bitstream/2268/195134/1/Michel_IsoEcol2016.pdf |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
_version_ |
1796935717019975680 |