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DEPE | Séminaires BEEPSS / BEEPSS Seminars » Sex & Sensitivity: Contaminants, telomeres and oxidative stress in two (...)

Sex & Sensitivity: Contaminants, telomeres and oxidative stress in two ice-dependent Polar seabirds

Last update: : Tuesday 3 October 2017, by Nicolas Busser

Presented by: Norith Eckbo, University of Oslo
Date: Thursday 5th Oct 2017, 13:30-15:00
Place: IPHC, Amphithéâtre Grünewald, bâtiment 25

What makes a bird sensitive to contaminants and what is sensitivity? In this study, we investigate how two Polar seabirds species, the Black guillemot (Cepphus grylle) and Adélie penguin (Pygocelis adeliae) are exposed to and effected by long-range transported contaminants. To do so, we measured legacy and emerging contaminants, relative telomere length, oxidative stress and stable isotopes in the blood of Black guillemots breeding in Kongsfjorden, Svalbard during June 2015 and Adélie penguins with known age and life history, breeding in the ANTAVIA study colony, Dumont d’Urville, during the austral summer 2015/16. The Black guillemot show overall higher contaminant concentrations and more heterogenous contaminant profiles compared to the Adélie penguins. Our data also suggest a non-linear relationship between contaminants and telomere length in the Black guillemot, and we propose a model for how contaminants may contribute to accelerate telomere reduction. Interestingly, the males of the Adélie penguin show different profiles and higher concentrations of contaminants compared to females, which raises the following question: how may sex differences in breeding and foraging behaviour influence sensitivity to contaminants in Adélie penguins?

http://www.mn.uio.no/ibv/english/research/projects/polar-ecotox/