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Staying cool also has consequences: increased sea ice cover disrupts food web structure in East Antarctica-Data

Citation

Michel L (2019): Staying cool also has consequences: increased sea ice cover disrupts food web structure in East Antarctica-Data. v1.1. SCAR - AntOBIS. Dataset/Occurrence. https://ipt.biodiversity.aq/resource?r=ddu_isotopes_verso_2013_2015&v=1.1 https://doi.org/10.15468/wgfw0h accessed via GBIF.org on 2023-01-27.

Description

Samples collected in the framework of a study to understand implications of these environmental changes for coastal Southern Ocean ecosystemsThis study looked at benthic food web structure on the coasts of Adélie Land during an event of unusually high sea ice cover (i.e. two successive austral summers without seasonal break-up). Using time-tested integrative trophic markers (stable isotope ratios of carbon, nitrogen and sulfur) and state-of-the-art data analysis tools (Bayesian ecological models), exploring feeding habits of benthic macroinvertebrates communities. In total, 28 taxa spanning most present animal groups and functional guilds were investigated.

Sampling Description

Study Extent

Sampling took place in the surroundings of Dumont-d'Urville station (French Polar Institute Paul-Emile Victor - IPEV), on Petrels Island (Adélie Land, East Antarctica) during the austral summers of 2013-2014 (sampling dates: 22 - 26/01/2014) and 2014-2015 (sampling dates: 17/12/2014 - 12/01/2015). During these two austral summers, extreme sea ice conditions occurred, as fast ice did not undergo seasonal breakup for two successive years (ice thickness fluctuating between 40 and over 200 cm during summer, cf. supporting information S1). Two sampling sites were chosen. Site 1 ("Anse du Lion"; 140.003° E, 66.661° S) was visited during both sampling campaigns, while site 2 ("Cap des Eléphants"; 139.997° E, 66.667° S) was sampled only in 2014-2015. In both sampling campaigns, both sites were covered by a thick layer of fast ice (from around 100 to over 200 cm, supporting information S1), and holes were drilled to allow access to the sea

Sampling

Six items (producers or organic matter pools) were identified as potential food sources for primary consumers. Sympagic algae, that mostly occurred as several cm long filaments, were sampled by SCUBA divers by scraping the lower surface of fast ice. The dominant macroalgae, the large Phaeophyceae Himantothallus grandifolius and the Rhodophyceae Phyllophora antarctica, were hand-collected by SCUBA divers. Benthic biofilm was collected by scraping rocks in situ. It was scarce in 2013-2014 but extremely abundant in 2014-2015 (thick layer of several cm covering rocks but also macroalgae and sponges, supporting information S2). Seawater for suspended particulate organic matter (SPOM) was collected through the diving holes, at 10 m depth using a Niskin bottle. 195 Seawater was then pre-sieved to remove items larger than 5 mm, and filtered on pre-combusted (4h at 400 °C) glass fiber filters (Whatman GF/F, sieve size 0.7 μm). For each SPOM sample, 20 liters of seawater were filtered. Finally, samples of the abundant deposits of guano surrounding the extensive colonies of Adélie penguins (Pygoscelis adeliae) were hand collected on land, in vicinity of the diving holes.

Method steps

  1. /

Taxonomic Coverages

  1. Acodontaster
    rank: genus
  2. Adamussium colbecki
    rank: species
  3. Ammothea carolinensis
    rank: species
  4. Benthic biofilm
  5. Charcotia obesa
    rank: species
  6. Decolopoda australis
    rank: species
  7. Demospongiae
    rank: species
  8. Diplasterias brucei
    rank: species
  9. Flabegraviera mundata
    rank: species
  10. Golfingia
    rank: genus
  11. Harmothoe
    rank: genus
  12. Hemigellius
    rank: genus
  13. Heterocucumis
    rank: genus
  14. Himantothallus grandifolius
    rank: species
  15. Homaxinella balfourensis
    rank: species
  16. Isotealia antarctica
    rank: species
  17. Laternula elliptica
    rank: species
  18. Margarella
    rank: genus
  19. Marseniopsis
    rank: genus
  20. Mycale acerata
    rank: species
  21. Deontostoma
    rank: genus
  22. Odontaster validus
    rank: species
  23. Ophiura
    rank: genus
  24. Parborlasia corrugatus
    rank: species
  25. Perkinsiana
    rank: genus
  26. Phyllophora antarctica
    rank: species
  27. Polycirrus
    rank: genus
  28. Pygoscelis adeliae guano
    rank: species
  29. Saliasterias brachiata
    rank: species
  30. Staurocucumis
    rank: genus
  31. Sterechinus neumayeri
    rank: species
  32. Suspended particulate organic matter
  33. Sympagic algae
    rank: unranked
  34. Trophonella longstaffi
    rank: species

Geographic Coverages

East Antarctica, Adélie Land, Dumont-d’Urville research station

Bibliographic Citations

Contacts

Loïc Michel
originator
position: Researcher
University of Liege, Laboratory of Oceanology
Anton Van de Putte
metadata author
email: antonarctica@gmail.com
Anton Van de Putte
user
email: antonarctica@gmail.com
Loïc Michel
administrative point of contact
position: Researcher
University of Liege, Laboratory of Oceanology
BE
Bruno Danis
administrative point of contact
position: Researcher
Université Libre de Bruxelles, Marine Biology Department
BE
Philippe Dubois
administrative point of contact
position: Researcher
Université Libre de Bruxelles, Marine Biology Department
BE
Marc Eléaume
administrative point of contact
position: Researcher
Muséum national d’Histoire naturelle
FR
Jérôme Fournier
administrative point of contact
position: Researcher
Muséum National d'Histoire Naturelle, Station de Biologie Marine, 29182
FR
Cyril Gallut
administrative point of contact
Sorbonne Université
FR
Philip Jane
administrative point of contact
Aquarium de Paris - Cinéaqua
FR
Gilles Lepoint
administrative point of contact
University of Liege, Laboratory of Oceanology
BE
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