Feeding ecology of sea stars of the Southern Ocean: possible influence of sea ice on trophic niche partitioning
Sea stars (Echinodermata: Asteroidea) are a key component of the Southern Ocean benthos, with 12% of the known sea star species living in the Southern Ocean. This group is considered quite resistant to seawater temperature changes. However, it is still likely to be impacted by the modifications of e...
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ftorbi:oai:orbi.ulg.ac.be:2268/225975 2024-04-21T07:50:15+00:00 Feeding ecology of sea stars of the Southern Ocean: possible influence of sea ice on trophic niche partitioning Le Bourg, Baptiste Blanchard, Alice Danis, Bruno Jossart, Quentin Lepoint, Gilles Moreau, Camille Michel, Loïc 2018-05-31 https://orbi.uliege.be/handle/2268/225975 https://orbi.uliege.be/bitstream/2268/225975/1/LeBourg-16echino-6.pdf en eng https://orbi.uliege.be/handle/2268/225975 info:hdl:2268/225975 https://orbi.uliege.be/bitstream/2268/225975/1/LeBourg-16echino-6.pdf open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess 16th International Echinoderm Conference, Nagoya, Japan [JP], du 28 mai 2018 au 1 juin 2018 sea stars antarctic sea ice trophic ecology stable isotopes 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 2018 ftorbi 2024-03-27T14:48:49Z Sea stars (Echinodermata: Asteroidea) are a key component of the Southern Ocean benthos, with 12% of the known sea star species living in the Southern Ocean. This group is considered quite resistant to seawater temperature changes. However, it is still likely to be impacted by the modifications of environmental conditions and food web functioning linked to climate change occurring in the Southern Ocean. Indeed, reduced abundances or disappearance of common prey put sea star populations at risk. However, trophic diversity, and notably capacity to switch prey according to environmental conditions (i.e. trophic plasticity) could help Southern Ocean sea stars to cope with climate-induced modifications of food web functioning. Western Antarctic Peninsula is one of the most rapidly warming regions of the world, resulting in sharp decreases in sea ice cover and ice season duration. In this context, this study used stable isotopes ratios of C (hereafter referred to as δ13C) and N (hereafter δ15N) to investigate the trophic ecology of sea stars and characterise their trophic diversity and plasticity along the continental shelf of Western Antarctic Peninsula. Sea stars were sampled during the austral summer in the South Shetland Islands, the South Orkney Islands and in Marguerite Bay. Intra- and interspecific patterns in trophic diversity were investigated in each region using isotopic dispersion as well as isotopic niche (proxy of the realised ecological niche) areas and overlap. In South Shetland and South Orkney Islands, sea stars were sampled far from the sea ice edge. In Shetland Islands, there was no difference of δ13C values between species or between the islands, indicating that sea stars of this region could rely on a common basal food source such as sinking phytoplankton. The overlap between the isotopic niches of sea star species was also important and sometimes complete at the scale of the whole region. Sea star species from South Orkney Islands had more variable δ13C but usually similar δ15N, suggesting a ... Conference Object Antarc* Antarctic Antarctic Peninsula Sea ice South Orkney 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 antarctic sea ice trophic ecology stable isotopes Life sciences Aquatic sciences & oceanology Environmental sciences & ecology Zoology Sciences du vivant Sciences aquatiques & océanologie Sciences de l’environnement & écologie Zoologie |
spellingShingle |
sea stars antarctic sea ice trophic ecology stable isotopes Life sciences Aquatic sciences & oceanology Environmental sciences & ecology Zoology Sciences du vivant Sciences aquatiques & océanologie Sciences de l’environnement & écologie Zoologie Le Bourg, Baptiste Blanchard, Alice Danis, Bruno Jossart, Quentin Lepoint, Gilles Moreau, Camille Michel, Loïc Feeding ecology of sea stars of the Southern Ocean: possible influence of sea ice on trophic niche partitioning |
topic_facet |
sea stars antarctic sea ice trophic ecology stable isotopes Life sciences Aquatic sciences & oceanology Environmental sciences & ecology Zoology Sciences du vivant Sciences aquatiques & océanologie Sciences de l’environnement & écologie Zoologie |
description |
Sea stars (Echinodermata: Asteroidea) are a key component of the Southern Ocean benthos, with 12% of the known sea star species living in the Southern Ocean. This group is considered quite resistant to seawater temperature changes. However, it is still likely to be impacted by the modifications of environmental conditions and food web functioning linked to climate change occurring in the Southern Ocean. Indeed, reduced abundances or disappearance of common prey put sea star populations at risk. However, trophic diversity, and notably capacity to switch prey according to environmental conditions (i.e. trophic plasticity) could help Southern Ocean sea stars to cope with climate-induced modifications of food web functioning. Western Antarctic Peninsula is one of the most rapidly warming regions of the world, resulting in sharp decreases in sea ice cover and ice season duration. In this context, this study used stable isotopes ratios of C (hereafter referred to as δ13C) and N (hereafter δ15N) to investigate the trophic ecology of sea stars and characterise their trophic diversity and plasticity along the continental shelf of Western Antarctic Peninsula. Sea stars were sampled during the austral summer in the South Shetland Islands, the South Orkney Islands and in Marguerite Bay. Intra- and interspecific patterns in trophic diversity were investigated in each region using isotopic dispersion as well as isotopic niche (proxy of the realised ecological niche) areas and overlap. In South Shetland and South Orkney Islands, sea stars were sampled far from the sea ice edge. In Shetland Islands, there was no difference of δ13C values between species or between the islands, indicating that sea stars of this region could rely on a common basal food source such as sinking phytoplankton. The overlap between the isotopic niches of sea star species was also important and sometimes complete at the scale of the whole region. Sea star species from South Orkney Islands had more variable δ13C but usually similar δ15N, suggesting a ... |
format |
Conference Object |
author |
Le Bourg, Baptiste Blanchard, Alice Danis, Bruno Jossart, Quentin Lepoint, Gilles Moreau, Camille Michel, Loïc |
author_facet |
Le Bourg, Baptiste Blanchard, Alice Danis, Bruno Jossart, Quentin Lepoint, Gilles Moreau, Camille Michel, Loïc |
author_sort |
Le Bourg, Baptiste |
title |
Feeding ecology of sea stars of the Southern Ocean: possible influence of sea ice on trophic niche partitioning |
title_short |
Feeding ecology of sea stars of the Southern Ocean: possible influence of sea ice on trophic niche partitioning |
title_full |
Feeding ecology of sea stars of the Southern Ocean: possible influence of sea ice on trophic niche partitioning |
title_fullStr |
Feeding ecology of sea stars of the Southern Ocean: possible influence of sea ice on trophic niche partitioning |
title_full_unstemmed |
Feeding ecology of sea stars of the Southern Ocean: possible influence of sea ice on trophic niche partitioning |
title_sort |
feeding ecology of sea stars of the southern ocean: possible influence of sea ice on trophic niche partitioning |
publishDate |
2018 |
url |
https://orbi.uliege.be/handle/2268/225975 https://orbi.uliege.be/bitstream/2268/225975/1/LeBourg-16echino-6.pdf |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice South Orkney Islands South Shetland Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice South Orkney Islands South Shetland Islands Southern Ocean |
op_source |
16th International Echinoderm Conference, Nagoya, Japan [JP], du 28 mai 2018 au 1 juin 2018 |
op_relation |
https://orbi.uliege.be/handle/2268/225975 info:hdl:2268/225975 https://orbi.uliege.be/bitstream/2268/225975/1/LeBourg-16echino-6.pdf |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
_version_ |
1796934050062008320 |