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Bioconcentration may be favoured over biomagnification for fish PCB contamination in high altitude lakes / Marie-Elodie Perga in Inland waters, 7 (2017) 

Public Citation [article]  inInland waters > 7 (2017) . - 14-26 Titre : Bioconcentration may be favoured over biomagnification for fish PCB contamination in high altitude lakes Type de document : Imprimé Auteurs : Marie-Elodie Perga ; Yann-Michel Nellier ; Nathalie Cottin ; Philippe Fanget ; Emmanuel Naffrechoux Année de publication : 2017 Article en page(s) : 14-26 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Lac d'altitude [CBNPMP-Thématique] Pollution de l'eau Résumé : Cold aquatic ecosystems such as high altitude alpine lakes are expected to act as long-term sinks of polychlorinated biphenyls (PCBs), the burden of which might even be intensified by global warming. Because the physical, chemical, and biological structures of high altitude lakes are highly responsive to climate change, both PCB exposure and bioaccumulation are likely to be strongly altered in the near future. Yet, in the absence of mechanistic knowledge of the processes regulating fish contamination with PCB in such ecosystems, their fate cannot be predicted. The aim of this study was to investigate the relative roles of biomagnification and bioconcentration on the individual, seasonal, and between-site variability of fish PCB contamination in 2 alpine, high altitude lakes. The intra- and within-lake variability of fish PCBs was not related to differences in fish physiology (size, age, or lipid content) and only marginally tied to fish feeding habitats (assessed from fatty acid composition and δ13C) or trophic position (δ15N). These results suggested that the trophic pathway and biomagnification contributed little to the observed differences in fish PCB concentrations between lakes, seasons, and individuals. Moreover, the fish PCB levels did not depend on the total PCB concentration in the water, but the fish contamination dynamics during the spring thaw pointed to a significant role of dissolved PCBs during this season in both lakes. In high altitude lakes, low temperatures might contribute to kinetically limit equilibrium with dietary PCBs, thereafter favouring bioconcentration over biomagnification pathways by which fish become contaminated with PCBs. Lien pérenne : DOI : 10.1080/20442041.2017.1294320 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=152370 Perga, Marie-Elodie, Nellier, Yann-Michel, Cottin, Nathalie, Fanget, Philippe, Naffrechoux, Emmanuel 2017 Bioconcentration may be favoured over biomagnification for fish PCB contamination in high altitude lakes. Inland waters, 7: 14-26.

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Scientists’ warning to humanity: rapid degradation of the world’s large lakes / Jean-Philippe Jenny in Journal of great lakes research, 46 (4) (August 2020) 

Public Citation [article]  inJournal of great lakes research > 46 (4) (August 2020) . - 686-702 Titre : Scientists’ warning to humanity: rapid degradation of the world’s large lakes Type de document : Imprimé Auteurs : Jean-Philippe Jenny ; Orlane Anneville ; Fabien Arnaud ; Yoann Baulaz ; Damien Bouffard ; Isabelle Domaizon ; Serghei A. Bocaniov ; Nathalie Chèvre ; Maria Dittrich ; Jean-Marcel Dorioz ; Erin S. Dunlop ; Gaël Dur ; Jean Guillard ; Thibault Guinaldo ; Stéphan Jacquet ; Aurélien Jamoneau ; Zobia Jawed ; Erik Jeppesen ; Gail Krantzberg ; John D. Lenters ; Barbara Leoni ; Michel Meybeck ; Veronica Nava ; Tiina Nõges ; Peeter Nõges ; Martina Patelli ; Victoria Pebbles ; Marie-Elodie Perga ; Serena Rasconi ; Carl R. Ruetz ; Lars Rudstam ; Nico Salmaso ; Sharma Sapna ; Dietmar Straile ; Olga Tammeorg ; Michael R. Twiss ; Donald G. Uzarski ; Anne-Mari Ventelä ; Vincent Warwick F. ; Steven W. Wilhelm ; Sten-Ake Wängberg ; Gesa A. Weyhenmeyer Année de publication : 2020 Article en page(s) : 686-702 Catégories : [LOTERRE-Biodiversité] Changement climatique [CBNPMP-Thématique] Conservation et gestion de l'eau [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude [CBNPMP-Thématique] L'eau dans l'écosystème Résumé : Large lakes of the world are habitats for diverse species, including endemic taxa, and are valuable resources that provide humanity with many ecosystem services. They are also sentinels of global and local change, and recent studies in limnology and paleolimnology have demonstrated disturbing evidence of their collective degradation in terms of depletion of resources (water and food), rapid warming and loss of ice, destruction of habitats and ecosystems, loss of species, and accelerating pollution. Large lakes are particularly exposed to anthropogenic and climatic stressors. The Second Warning to Humanity provides a framework to assess the dangers now threatening the world’s large lake ecosystems and to evaluate pathways of sustainable development that are more respectful of their ongoing provision of services. Here we review current and emerging threats to the large lakes of the world, including iconic examples of lake management failures and successes, from which we identify priorities and approaches for future conservation efforts. The review underscores the extent of lake resource degradation, which is a result of cumulative perturbation through time by long-term human impacts combined with other emerging stressors. Decades of degradation of large lakes have resulted in major challenges for restoration and management and a legacy of ecological and economic costs for future generations. Large lakes will require more intense conservation efforts in a warmer, increasingly populated world to achieve sustainable, high-quality waters. This Warning to Humanity is also an opportunity to highlight the value of a long-term lake observatory network to monitor and report on environmental changes in large lake ecosystems. Lien pérenne : DOI : 10.1016/j.jglr.2020.05.006 / HAL : hal-02746258 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=152168 Jenny, Jean-Philippe, Anneville, Orlane, Arnaud, Fabien, Baulaz, Yoann, Bouffard, Damien, Domaizon, Isabelle, Bocaniov, Serghei A., Chèvre, Nathalie, Dittrich, Maria, Dorioz, Jean-Marcel, Dunlop, Erin S., Dur, Gaël, Guillard, Jean, Guinaldo, Thibault, Jacquet, Stéphan, Jamoneau, Aurélien, Jawed, Zobia, Jeppesen, Erik, Krantzberg, Gail, Lenters, John D., Leoni, Barbara, Meybeck, Michel, Nava, Veronica, Nõges, Tiina, Nõges, Peeter, Patelli, Martina, Pebbles, Victoria, Perga, Marie-Elodie, Rasconi, Serena, Ruetz, Carl R., Rudstam, Lars, Salmaso, Nico, Sapna, Sharma, Straile, Dietmar, Tammeorg, Olga, Twiss, Michael R., Uzarski, Donald G., Ventelä, Anne-Mari, Warwick F., Vincent, Wilhelm, Steven W., Wängberg, Sten-Ake, Weyhenmeyer, Gesa A. 2020 Scientists’ warning to humanity: rapid degradation of the world’s large lakes. Journal of great lakes research, 46(4): 686-702.

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