Feeding ecology of Southern Ocean seastars inferred from stable isotopes ratios Baptiste LE BOURGa, Alice BLANCHARDa, Bruno DANISb, Gilles LEPOINTa, Camille MOREAUb, Quentin JOSSARTb, Loïc N. MICHELa. Contact:
[email protected] a: Laboratory of Oceanology, University of Liège, 4000 Liège Belgium, b: Marine Biology Lab, Université Libre de Bruxelles, 1050 Brussels Antarctic continent and Southern Ocean subjected to strong and 213 seastars (16 species) were sampled in western Antarctic contrasted impacts of climate change => Impacts on marine (South Shetland Islands, Coronation Islands, Western Antarctic food webs? Peninsula) and near subantarctic islands (South Georgia, South Sandwich Islands, Falkland Islands) during the summer Sea stars will be subjected to new stress and environmental constraints due to climate change Stable isotope ratios of C (δ13C), N (δ15N) and S (δ34S) in tegument were measured by CF-EA-IRMS Objective: Investigating trophic ecology of antarctic seastars Examples of sampled seastar species Examples of sampled seastar species Falkland (pictures: Dirk Schories and Norbert Wu) Islands (pictures: Shawn Harper and Dirk Schories) South Shetland Islands Coronation Island Western Antarctic South Peninsula Georgia Sandwich Islands Lophaster sp. Odontaster validus Glabraster Labidiaster and Acodontaster sp. antarctica annulatus Analyses of variance and post-hoc tests show differences in stable isotope ratios between the South Shetland Islands and South Georgia South Shetland Islands Number of individuals ≥ 5: