Project description
Effects of mercury on the Arctic’s little auk bird
Levels of the metal mercury (Hg) have tripled in the upper ocean since the start of the Industrial Revolution. Mercury in rivers, lakes and oceans presents the biggest risk. Converted into a toxic form called methylmercury, it is absorbed by animals and moves up the food chain until it reaches humans. Selenium (Se) has a protective effect against Hg toxicity. The EU-funded DeToxSea project will assess the Se/Hg interaction. It will focus on the little auk, a breeding bird in the Arctic. The project will investigate if Se/Hg concentrations affect the reproductive output of little auks. The findings will shed light on the demographic effects of Se/Hg toxic contamination in Arctic wildlife.
Objective
Mercury (Hg) concentrations in the oceans have tripled in the last centuries, even in remote areas such as the Arctic. Hg is bioaccumulated in food webs and can produce toxic effects affecting breeding and survival probabilities in wildlife. Selenium (Se) has been proved to have a protective effect against Hg toxicity, but no long-term studies have been carried out to evaluate reproductive output and population dynamics in relation to Se or the interaction Se-Hg. Using as a population model the most abundant breeding bird in the Arctic, the little auk (Alle alle), I aim to 1) evaluate the temporal trends of Se/Hg and on which intrinsic/extrinsic factors they depend on; 2) investigate if Se/Hg concentrations affect the reproductive output of little auks (i.e. at the individual level); and 3) evaluate the effects of Se/Hg at the population levels in the context of climate change (i.e. considering environmental conditions). To do so, I will use data of 15 years of monitoring on little auks from west Greenland (Kape Høegh). I will analyse pollutants on blood samples at the host laboratory, and I will perform different statistical approaches to investigate our objectives. In particular, we will look for functional relationships to evaluate pollutants temporal/environmental trends and their toxic effects on the reproductive output of little auks; and demographic models (multistate mark-recapture models and matrix population models) to evaluate the projected population growth rate and its sensitivity to Hg/Se and environmental conditions. This research program will gather knowledge from a large interdisciplinary team, with expertise in ecotoxicology and demography. We anticipate major public interest for the results of DeToxSea: the unique long-term study about demographic effects of Se/Hg toxic contamination in Arctic wildlife, that will give light to one of the Challenges of Horizon 2020 about Climate Action, Environment, Resource Efficiency and Raw Materials.
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Programme(s)
Funding Scheme
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinator
17031 La Rochelle
France