Stable isotope ratios of C, N and S in Southern Ocean sea stars (1985-2017)
This dataset is a compilation of stable isotope ratios of C, N and S in tissues of 2456 sea stars sampled from 1985 to 2017 in the Southern Ocean (Antarctica and Subantarctic Islands). Stable isotope values were measured in the framework of Baptiste Le Bourg's PhD thesis at University of Liège, entitled “Trophic ecology of Southern Ocean sea stars: Influence of environmental drivers on trophic diversity”. Samples were provided by the University of Liège (Belgium), the Université Libre de Bruxelles (Belgium), the National Museum of Natural History (Paris, France) and the Institute of Oceanology of the Polish Academy of Sciences (Sopot, Poland). This work was supported by BELSPO through the vERSO and RECTO projects (contracts no. BR/132/A1/vERSO and BR/154/A1/RECTO).
The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 2,456 records.
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Please be aware, this is an old version of the dataset. Researchers should cite this work as follows:
Le Bourg B, Moreau C, Lepoint G, Danis B, Michel L N (2021): Stable isotope ratios of C, N and S in Southern Ocean sea stars (1985-2017). v1.4. Antarctic Biodiversity Information Facility (ANTABIF). Dataset/Occurrence. https://ipt.biodiversity.aq/resource?r=antarctic_subantarctic_asteroidea_isotopes&v=1.4
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The publisher and rights holder of this work is SCAR - AntOBIS. This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.
Occurrence; Southern Ocean; sea stars; stable isotopes; trophic ecology; Specimen
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Antarctic and Sub-Antarctic regions of the Southern Ocean
|Bounding Coordinates||South West [-76.273, -127.267], North East [-47.717, 162.201]|
|Class||Asteroidea (Sea star)|
|Genus||Acodontaster, Anasterias, Bathybiaster, Anseropoda, Cheiraster, Diplasterias, Eremicaster, Henricia, Hymenaster, Hyphalaster, Lophaster, Lysasterias, Mixaster, Notasterias, Odontaster, Paralophaster, Pedicellaster, Peribolaster, Perknaster, Pteraster, Smilasterias, Solaster|
|Species||Acodontaster capitatus, Acodontaster conspicuus, Acodontaster elongatus, Acodontaster hodgsoni, Acodontaster marginatus, Adelasterias papillosa, Anasterias antarctica, Anasterias perrieri, Anteliaster scaber, Asterina fimbriata, Bathybiaster loripes, Bathybiaster vexillifer, Cheiraster (Luidiaster) gerlachei, Cheiraster (Luidiaster) planeta, Cheiraster complex, Cheiraster hirsutus, Cosmasterias lurida, Cuenotaster involutus, Cycethra verrucosa, Diplasterias brandti, Diplasterias brucei, Diplasterias meridionalis, Diplodontias singularis, Dytaster felix, Eremicaster pacificus, Freyastera tuberculata, Freyella attenuata, Glabraster antarctica, Henricia smilax, Hippasteria phrygiana, Hymenaster sacculatus, Kampylaster incurvatus, Kenrickaster pedicellaris, Labidiaster annulatus, Labidiaster radiosus, Leptychaster flexuosus, Leptychaster kerguelensis, Lophaster furcilliger, Lophaster gaini, Lophaster stellans, Lysasterias adeliae, Lysasterias digitata, Macroptychaster accrescens, Notasterias armata, Notasterias bongraini, Notasterias candicans, Notasterias stolophora, Notioceramus anomalus, Odinella nutrix, Odontaster meridionalis, Odontaster pearsei, Odontaster penicillatus, Odontaster roseus, Odontaster validus, Paralophaster antarcticus, Paralophaster lorioli, Peribolaster folliculatus, Peribolaster macleani, Perknaster densus, Perknaster fuscus, Perknaster sladeni, Porcellanaster ceruleus, Psalidaster mordax, Pseudarchaster discus, Psilaster charcoti, Pteraster affinis, Pteraster stellifer, Remaster gourdoni, Rhopiella hirsuta, Saliasterias brachiata, Smilasterias scalprifera, Smilasterias triremis, Solaster longoi, Solaster regularis, Styracaster chuni, Tremaster mirabilis|
|Start Date / End Date||1985-01-11 / 2017-03-08|
The data presented here were obtained in the framework of a PhD project. The goal of this PhD project was to study the trophic ecology of sea stars in the Southern Ocean using stable isotopes of carbon, nitrogen and sulfur. In particular, the relationship between trophic ecology and environmental conditions was assessed. The functioning of Southern Ocean ecosystems and the impact of climate change on them was thus a central theme of the PhD thesis. Indeed, changes in the availability of trophic resources induced by environmental changes can lead to changes of trophic ecology of species and of trophic interactions between them. This PhD thesis was carried out as part of the vERSO (Ecosystem Responses to global change: a multiscale approach in the Southern Ocean; BR/132/A1/vERSO) and RECTO (Refugia and Ecosystem Tolerance in the Southern Ocean; BR/154/A1/RECTO) projects, funded by the Belgian Science Policy Office (BELSPO).
|Title||Trophic ecology of Southern Ocean sea stars: Influence of environmental drivers on trophic diversity|
|Funding||This project was funded thanks to a FRIA doctoral grant (Fund for research training in industry and agriculture) provided by the FRS-FNRS.|
The personnel involved in the project:
|Study Extent||A double sampling strategy was set up to maximise the scope of this PhD thesis. First, sea stars were collected in the Southern Ocean during campaigns taking place in the framework of the vERSO and RECTO projects from December 2015 to March 2017. Second, suitable samples originating from multiple oceanographic campaigns and surveys from January 1985 to January 2015 were retrieved from archived collections stored in museums or institutions. Institutions that provided samples included the Université Libre de Bruxelles (Belgium), the National Museum of Natural History (Paris, France) and the Institute of Oceanology of the Polish Academy of Sciences (Sopot, Poland).|
Method step description:
- Sampling: Sea stars were sampled in the Southern Ocean from 1985 to 2017 throughout multiple oceanographic campaigns. Storage: Depending of the sampling campaign, sea stars were frozen, dried, stored in ethanol or fixed with formaldehyde and then stored in ethanol. Sample preparation: For each sea star, one or several arms were separated from the central disc. Internal organs and podia were removed in each arm. With the exception of the already dried samples, the tegument and the podia of each arm were washed with demineralised water and oven-dried at 50°C during 48 hours. All samples were then homogenised into powder. Carbonates were removed from subsamples by exposing subsamples to 37 % hydrochloric acid vapour during 48 hours. Acidified subsamples were then kept at 60°C until further sample preparation. Stable isotope analysis: The subsamples were then precisely weighed (ca 2.5-3 mg) in 5×8 tin cups with ca 3 mg of tungsten trioxide. Their elemental composition and their stable isotope values were analysed with an elemental analyser coupled to a continuous-flow isotope-ratio mass spectrometer. Impact of preservation on stable isotope values: Correction factors were added to the δ13C and δ34S values of sea stars fixed with formaldehyde and/or stored in ethanol as fixation in formaldehyde and preservation in ethanol impact stable isotope values in sea stars (Le Bourg et al., 2020). For samples stored in ethanol, a correction factor of –0.6 ‰ was subtracted to δ13C values. For samples fixed with formaldehyde and then stored in ethanol, a correction factor of 0.2 ‰ was added to δ13C values to take into account the effects of both ethanol (–0.6 ‰) and formaldehyde (+0.8 ‰) on δ13C values. A correction factor of 1.5 ‰ was also added to δ34S values for samples fixed with formaldehyde. Reference: Le Bourg B, Lepoint G, Michel LN. 2020. Effects of preservation methodology on stable isotope compositions of sea stars. Rapid Communications in Mass Spectrometry 34, e8589.