Conférence Sharks International 2022 (SI2022), octobre 2022, Valence (Espagne)

La Conférence Sharks International 2022 (SI2022) se tient à Valence en Espagne, en présentiel du 20 au 22 octobre et en visio du 10 au 14 octobre 2022 .

Noemie Coulon, doctorante en écologie marine, au sein du laboratoire BOREA, au CRESCO à Dinard,  présentera une communication intitulée  " Northeast Atlantic elasmobranchs on the move: different responses to climate change across functional traits and phylogeny" , mardi 11 octobre 2022, au cours de la session consacrée à "Threats beyond overfishing 2" de 17h45 .

Résumé :

Ongoing climate change is responsible for shifting the distribution of many marine species and may lead to changes in community structure and ecosystem functioning, especially where species perform unique functions such as elasmobranchs. However, these issues have been rarely studied in these species due to the limited spatio-temporal information and may have led to an underestimation of the underlying threats. Identifying functional traits that explain range shifts in elasmobranchs, rather than studying individual species responses, may provide complementary insight. Our aim was therefore to detect and quantify distribution changes in demersal elasmobranchs in response to ocean acidification and increasing sea temperature and assess whether such changes can be attributed to their functional traits. To undertake this study, we collated scientific bottom trawl surveys data from 1997-2020 across the European continental shelf and employed a multispecies joint distribution model to model their habitat and understand potential variations in distribution with time according to sea water temperature and pH.The responses of trophic and reproductive guilds, distribution traits according to these climate change variables were equally explored. From this analysis we highlight species whose range has shifted over the past two decades. Community structure variations are described over time and functional groups that appear to be more vulnerable to future climate changes identified. Fishing pressure is also tested as a complementary factor affecting elasmobranch distribution over time.