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Factors affecting methylmercury biomagnification by a widespread aquatic invertebrate predator, the phantom midge larvae Chaoborus

Le Jeune, Anne-Hélène and Bourdiol, Floriane and Aldamman, Lama and Perron, Tania and Amyot, Marc and Pinel-Alloul, Bernadette Factors affecting methylmercury biomagnification by a widespread aquatic invertebrate predator, the phantom midge larvae Chaoborus. (2012) Environmental Pollution, 165. 100-108. ISSN 0269-7491

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Official URL: http://dx.doi.org/10.1016/j.envpol.2012.02.003

Abstract

MeHg biomagnification by the phantom midge Chaoborus in relation to MeHg concentrations in their prey and its migratory behavior was investigated in two Canadian Precambrian Shield lakes. Three Chaoborus species with contrasted migratory behavior were collected in a fishless and a fish-inhabited lake. All species accumulated MeHg through their ontogenic development. In the lake inhabited by fish, all instars of Chaoborus punctipennis displayed a marked migratory behavior and were unable to biomagnify MeHg, whereas in the fishless lake, Chaoborus americanus and Chaoborus trivittatus biomagnified MeHg. Reduced biomagnification capacity of C. trivittatus, the coexisting species living with C. americanus, was also ascribed to a progressive vertical segregation with age. Growth dilution, amount and type of prey items or trophic position could not explain the different patterns of biomagnification. Our findings demonstrate that the most common invertebrate predator of temperate planktonic food webs can biomagnify mercury, contrarily to previous reports.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science/article/pii/S0269749112000759
HAL Id:hal-00906302
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Institut National de la Recherche Scientifique - INRS (CANADA)
Other partners > Université de Montréal - UdeM (CANADA)
Other partners > Université du Québec à Trois-Rivières - UQTR (CANADA)
Other partners > Université du Québec à Montréal - UQAM (CANADA)
Other partners > Université McGill (CANADA)
Laboratory name:
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Deposited By: cirimat webmestre
Deposited On:17 Sep 2013 10:33

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