Pan-Arctic concentrations of mercury and stable isotope ratios of carbon (δ(13)C) and nitrogen (δ(15)N) in marine zooplankton
| Autor: | Karen L. Foster, Louis Fortier, Corinne Pomerleau, Gary A. Stern, Monika Pućko, Robie W. Macdonald |
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| Rok vydání: | 2015 |
| Předmět: |
Canada
Environmental Engineering 010504 meteorology & atmospheric sciences Nitrogen Biomagnification 010501 environmental sciences 01 natural sciences Zooplankton Copepoda Food chain Environmental Chemistry Animals Amphipoda Waste Management and Disposal Ecosystem 0105 earth and related environmental sciences Trophic level biology Stable isotope ratio Arctic Regions Mercury biology.organism_classification Pollution Carbon Oceanography Arctic Calanus Environmental science Bay Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | The Science of the total environment. |
| ISSN: | 1879-1026 |
| Popis: | Zooplankton play a central role in marine food webs, dictating the quantity and quality of energy available to upper trophic levels. They act as "keystone" species in transfer of mercury (Hg) up through the marine food chain. Here, we present the first Pan-Arctic overview of total and monomethylmercury concentrations (THg and MMHg) and stable isotope ratios of carbon (δ(13)C) and nitrogen (δ(15)N) in selected zooplankton species by assembling data collected between 1998 and 2012 from six arctic regions (Laptev Sea, Chukchi Sea, southeastern Beaufort Sea, Canadian Arctic Archipelago, Hudson Bay and northern Baffin Bay). MMHg concentrations in Calanus spp., Themisto spp. and Paraeuchaeta spp. were found to increase with higher δ(15)N and lower δ(13)C. The southern Beaufort Sea exhibited both the highest THg and MMHg concentrations. Biomagnification of MMHg between Calanus spp. and two of its known predators, Themisto spp. and Paraeuchaeta spp., was greatest in the southern Beaufort Sea. Our results show large geographical variations in Hg concentrations and isotopic signatures for individual species related to regional ecosystem features, such as varying water masses and freshwater inputs, and highlight the increased exposure to Hg in the marine food chain of the southern Beaufort Sea. |
| Databáze: | OpenAIRE |
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