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Séminaire


Ecotoxicologie polaire, un nouveau point chaud en Arctique

Date
le 16-12-2011 à 10:30

Lieu
Salle de réunion de EA, Station Marine, Arcachon

Intervenant(s)
Lionel CAMUS, Fram Centre- High North Research Centre for Climate and the Environment, Tromsø, Norway

Résumé
Lionel Camus is the Coordinator of the Petroleum & Environment Research Group Akvaplan-niva.

The Barents Sea is the largest among the pan-Arctic shelf seas that surround the Arctic Ocean. Forty-nine percent of the total pan-Arctic shelf primary production takes place in the Barents sea. Sea ice can cover up to 90% of the Barents Sea surface in winter. The ice plays a key role in the ecosystem structure and function by providing a habitat and food to highly specialized sea ice living creatures. The Barents Sea has become a main center of attention of the oil and gas industry. Additionally, there is a tremendous increase in oil maritime transport from Russia along the Norwegian coast to the European and American markets.As the anthropogenic activities gain momentum in the Barents Sea numerous challenges need to be tackled to ensure that this sea ice ecosystem is protected. Therefore, a set of environmental measures need to be taken to protect the Barents Sea for the future as a basis for sustainable welfare and wealth. Reliable risk assessment approaches for Arctic environments are requested to manage potential impacts associated with increased activities in Arctic regions. We performed toxicity tests on Arctic and temperate species exposed to the narcotic acting oil component. The experimental results were used to quantify concentration causing lethality to 50% of exposed individuals and no-effect concentration (individual level). For estimates at community level, the hazardous concentrations affecting 5% and 50% of the species were calculated from sensitivity distribution curves. These survival metrics were then used to elucidate whether temperate toxicity data used in risk assessment are sufficiently representative for the Arctic. The data will be presented and discussed during the talk.
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