Feeding ecology of Southern Ocean seastars inferred from stable isotopes ratios
The Southern Ocean is currently subjected to strong and contrasted impacts of climate change. The Western Antarctic Peninsula is one of the most rapidly warming regions of the world, resulting in sea ice cover decreases. Increasing seawater temperature and sea ice cover reduction in Western Antarcti...
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ftorbi:oai:orbi.ulg.ac.be:2268/201822 2024-04-21T07:52:37+00:00 Feeding ecology of Southern Ocean seastars inferred from stable isotopes ratios Le Bourg, Baptiste Blanchard, Alice Danis, Bruno Lepoint, Gilles Moreau, Camille Jossart, Quentin Michel, Loïc 2016-09-05 https://orbi.uliege.be/handle/2268/201822 https://orbi.uliege.be/bitstream/2268/201822/1/LeBourg-JESIUM-2016.pdf en eng https://orbi.uliege.be/handle/2268/201822 info:hdl:2268/201822 https://orbi.uliege.be/bitstream/2268/201822/1/LeBourg-JESIUM-2016.pdf open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess JOINT EUROPEAN STABLE ISOTOPES USER group MEETING (JESIUM 2016), Ghent, Belgium [BE], du 4 septembre 2016 au 9 septembre 2016 sea stars Southern Ocean stable isotopes Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie conference poster not in proceedings http://purl.org/coar/resource_type/c_18co info:eu-repo/semantics/conferencePoster 2016 ftorbi 2024-03-27T14:47:42Z The Southern Ocean is currently subjected to strong and contrasted impacts of climate change. The Western Antarctic Peninsula is one of the most rapidly warming regions of the world, resulting in sea ice cover decreases. Increasing seawater temperature and sea ice cover reduction in Western Antarctic Peninsula and associated regions will likely impact food web functioning through temperature-related changes in consumer physiology, modifications of benthic community structure (e.g. expansion of exogenous species such as predatory crabs), modifications of benthic-pelagic coupling intensity or disruption of benthic production. Asteroids (Echinoderms) are an important group of southern benthos. This group also has a great trophic variability and is potentially more resistant than other organisms to temperature changes (Peck et al. 2008). Consequently, they will be likely impacted by modifications in food webs functioning rather by direct warming and investigating their trophic ecology is necessary to infer how climate change will impact them. In this context, the aim of this study is to use stable isotopes ratios of C, N and S to infer sea stars trophic ecology. 16 species of sea stars spanning 10 different families sampled in multiple and contrasted habitats across Subantarctic (South Georgia, South Sandwich Islands, Falkland Islands) and Antarctic (South Shetland Islands, South Orkney Islands, Western Antarctic Peninsula) locations. In total, tegument samples from 213 specimens was analysed. Diversity and plasticity of asteroid diet along Southern Ocean coasts were explored through isotopic niche parametrisation (e.g. niche width and overlap between species and/or populations; Jackson et al. 2011). The data will also be used in a larger scale research project on the trophic ecology of Antarctic sea stars. This project will notably compare trophic resources supporting asteroid communities in Western Antarctic Peninsula, where sea ice cover is decreasing, and in Terre Adélie, where sea ice cover is increasing ... Conference Object Antarc* Antarctic Antarctic Peninsula Sea ice South Orkney Islands South Sandwich Islands South Shetland Islands Southern Ocean 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 |
sea stars Southern Ocean stable isotopes Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie |
spellingShingle |
sea stars Southern Ocean stable isotopes Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie Le Bourg, Baptiste Blanchard, Alice Danis, Bruno Lepoint, Gilles Moreau, Camille Jossart, Quentin Michel, Loïc Feeding ecology of Southern Ocean seastars inferred from stable isotopes ratios |
topic_facet |
sea stars Southern Ocean stable isotopes Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie |
description |
The Southern Ocean is currently subjected to strong and contrasted impacts of climate change. The Western Antarctic Peninsula is one of the most rapidly warming regions of the world, resulting in sea ice cover decreases. Increasing seawater temperature and sea ice cover reduction in Western Antarctic Peninsula and associated regions will likely impact food web functioning through temperature-related changes in consumer physiology, modifications of benthic community structure (e.g. expansion of exogenous species such as predatory crabs), modifications of benthic-pelagic coupling intensity or disruption of benthic production. Asteroids (Echinoderms) are an important group of southern benthos. This group also has a great trophic variability and is potentially more resistant than other organisms to temperature changes (Peck et al. 2008). Consequently, they will be likely impacted by modifications in food webs functioning rather by direct warming and investigating their trophic ecology is necessary to infer how climate change will impact them. In this context, the aim of this study is to use stable isotopes ratios of C, N and S to infer sea stars trophic ecology. 16 species of sea stars spanning 10 different families sampled in multiple and contrasted habitats across Subantarctic (South Georgia, South Sandwich Islands, Falkland Islands) and Antarctic (South Shetland Islands, South Orkney Islands, Western Antarctic Peninsula) locations. In total, tegument samples from 213 specimens was analysed. Diversity and plasticity of asteroid diet along Southern Ocean coasts were explored through isotopic niche parametrisation (e.g. niche width and overlap between species and/or populations; Jackson et al. 2011). The data will also be used in a larger scale research project on the trophic ecology of Antarctic sea stars. This project will notably compare trophic resources supporting asteroid communities in Western Antarctic Peninsula, where sea ice cover is decreasing, and in Terre Adélie, where sea ice cover is increasing ... |
format |
Conference Object |
author |
Le Bourg, Baptiste Blanchard, Alice Danis, Bruno Lepoint, Gilles Moreau, Camille Jossart, Quentin Michel, Loïc |
author_facet |
Le Bourg, Baptiste Blanchard, Alice Danis, Bruno Lepoint, Gilles Moreau, Camille Jossart, Quentin Michel, Loïc |
author_sort |
Le Bourg, Baptiste |
title |
Feeding ecology of Southern Ocean seastars inferred from stable isotopes ratios |
title_short |
Feeding ecology of Southern Ocean seastars inferred from stable isotopes ratios |
title_full |
Feeding ecology of Southern Ocean seastars inferred from stable isotopes ratios |
title_fullStr |
Feeding ecology of Southern Ocean seastars inferred from stable isotopes ratios |
title_full_unstemmed |
Feeding ecology of Southern Ocean seastars inferred from stable isotopes ratios |
title_sort |
feeding ecology of southern ocean seastars inferred from stable isotopes ratios |
publishDate |
2016 |
url |
https://orbi.uliege.be/handle/2268/201822 https://orbi.uliege.be/bitstream/2268/201822/1/LeBourg-JESIUM-2016.pdf |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice South Orkney Islands South Sandwich Islands South Shetland Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice South Orkney Islands South Sandwich Islands South Shetland Islands Southern Ocean |
op_source |
JOINT EUROPEAN STABLE ISOTOPES USER group MEETING (JESIUM 2016), Ghent, Belgium [BE], du 4 septembre 2016 au 9 septembre 2016 |
op_relation |
https://orbi.uliege.be/handle/2268/201822 info:hdl:2268/201822 https://orbi.uliege.be/bitstream/2268/201822/1/LeBourg-JESIUM-2016.pdf |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
_version_ |
1796935831515037696 |