Mercury concentrations in landlocked Arctic char (Salvelinus alpinus) from the Canadian Arctic. Part I: Insights from trophic relationships in 18 lakes

Concentrations of mercury (Hg) have increased slowly in landlocked Arctic char over a 10‐ to 15‐year period in the Arctic. Fluxes of Hg to sediments also show increases in most Arctic lakes. Correlation of Hg with trophic level (TL) was used to investigate and compare biomagnification of Hg in food webs from lakes in the Canadian Arctic sampled from 2002 to 2007. Concentrations of Hg (total Hg and methylmercury [MeHg]) in food webs were compared across longitudinal and latitudinal gradients in relation to δ13C and δ15N in periphyton, zooplankton, benthic invertebrates, and Arctic char of varying size‐classes. Trophic magnification factors (TMFs) were calculated for the food web in each lake and related to available physical and chemical characteristics of the lakes. The relative content of MeHg increased with trophic level from 4.3 to 12.2% in periphyton, 41 to 79% in zooplankton, 59 to 72% in insects, and 74 to 100% in juvenile and adult char. The δ13C signatures of adult char indicated coupling with benthic invertebrates. Cannibalism among char lengthened the food chain. Biomagnification was confirmed in all 18 lakes, with TMFs ranging from 3.5 ± 1.1 to 64.3 ± 0.8. Results indicate that TMFs and food chain length (FCL) are key factors in explaining interlake variability in biomagnification of [Hg] among different lakes. Environ. Toxicol. Chem. 2010;29:621–632. © 2009 SETAC

[1]  M. Power,et al.  Mercury concentrations in landlocked Arctic char (Salvelinus alpinus) from the Canadian Arctic. Part II: Influence of lake biotic and abiotic characteristics on geographic trends in 27 populations , 2010, Environmental toxicology and chemistry.

[2]  J. Newton,et al.  Stable Isotope Ecology , 2010 .

[3]  M. Power,et al.  Temporal trends of mercury, cesium, potassium, selenium, and thallium in arctic char (Salvelinus alpinus) from Lake Hazen, Nunavut, Canada: Effects of trophic position, size, and age , 2009, Environmental toxicology and chemistry.

[4]  K. Kidd,et al.  PCB concentrations in lake trout (Salvelinus namaycush) are correlated to habitat use and lake characteristics. , 2008, Environmental science & technology.

[5]  Alexandre J. Poulain,et al.  Metamorphosis in chironomids, more than mercury supply, controls methylmercury transfer to fish in High Arctic lakes. , 2008, Environmental science & technology.

[6]  K. Kidd,et al.  Influence of lake characteristics on the biomagnification of persistent organic pollutants in lake trout food webs , 2008, Environmental toxicology and chemistry.

[7]  N. Theys,et al.  Modeling dynamic exchange of gaseous elemental mercury at polar sunrise. , 2008, Environmental science & technology.

[8]  H. Skov,et al.  A synthesis of atmospheric mercury depletion event chemistry in the atmosphere and snow , 2008 .

[9]  B. Kelly,et al.  MERCURY AND OTHER TRACE ELEMENTS IN FARMED AND WILD SALMON FROM BRITISH COLUMBIA , CANADA , 2008 .

[10]  B. Kelly,et al.  Mercury and other trace elements in farmed and wild salmon from british Columbia, Canada , 2008 .

[11]  William W. Fetzer,et al.  Global patterns of aquatic food chain length , 2007 .

[12]  W. Vincent,et al.  Benthic and pelagic food resources for zooplankton in shallow high‐latitude lakes and ponds , 2006 .

[13]  D. Muir,et al.  Spatial and temporal trends of mercury and other metals in landlocked char from lakes in the Canadian Arctic archipelago. , 2005, The Science of the total environment.

[14]  K. Kidd,et al.  A history of total mercury in edible muscle of fish from lakes in northern Canada. , 2005, The Science of the total environment.

[15]  K. Hobson,et al.  Mercury and other trace elements in a pelagic Arctic marine food web (Northwater Polynya, Baffin Bay). , 2005, The Science of the total environment.

[16]  K. Gajewski,et al.  Distribution of Chironomidae (Insecta: Diptera) Head Capsules in Recent Sediments of Canadian Arctic Lakes , 2005, Hydrobiologia.

[17]  G. Mierle,et al.  Hydrochemistry and mercury cycling in a High Arctic watershed. , 2005, The Science of the total environment.

[18]  R. Macdonald,et al.  Recent climate change in the Arctic and its impact on contaminant pathways and interpretation of temporal trend data. , 2005, The Science of the total environment.

[19]  R. Borgstrøm,et al.  Cannibalism in Arctic charr: do all individuals have the same propensity to be cannibals? , 2005 .

[20]  M. Sharp,et al.  Some sources and sinks of monomethyl and inorganic mercury on Ellesmere Island in the Canadian High Arctic. , 2005, Environmental science & technology.

[21]  S. Siciliano,et al.  Snowmelt sources of methylmercury to high arctic ecosystems. , 2004, Environmental science & technology.

[22]  J. Grey,et al.  High intraspecific variability in carbon and nitrogen stable isotope ratios of lake chironomid larvae , 2004 .

[23]  S. Siciliano,et al.  Methylmercury production in high arctic wetlands , 2004, Environmental toxicology and chemistry.

[24]  J. Dempson,et al.  The Biology of Arctic Charr, Salvelinus Alpinus, of Gander Lake, A Large, Deep, Oligotrophic Lake in Newfoundland, Canada , 2002, Environmental Biology of Fishes.

[25]  J. Smol,et al.  Eutrophication and recovery in the High Arctic: Meretta Lake (Cornwallis Island, Nunavut, Canada) revisited , 2000, Hydrobiologia.

[26]  E. Jeppesen,et al.  Fish and crustaceans in northeast Greenland lakes with special emphasis on interactions between Arctic charr (Salvelinus alpinus), Lepidurus arcticus and benthic chydorids , 2004, Hydrobiologia.

[27]  R. Macdonald,et al.  AMAP Assessment 2002: The Influence of Global Change on Contaminant Pathways to, within, and from the Arctic. , 2003 .

[28]  D. Post.  USING STABLE ISOTOPES TO ESTIMATE TROPHIC POSITION: MODELS, METHODS, AND ASSUMPTIONS , 2002 .

[29]  M. Power,et al.  Using stable isotopes to confirm the trophic ecology of Arctic charr morphotypes from Lake Hazen, Nunavut, Canada , 2002 .

[30]  J. Rasmussen,et al.  Variation in δ15N and δ13C trophic fractionation: Implications for aquatic food web studies , 2001 .

[31]  K. Hobson,et al.  Influence of chemical and biological factors on trophic transfer of persistent organic pollutants in the northwater polynya marine food web. , 2001, Environmental science & technology.

[32]  Landlocked Arctic charr (Salvelinus alpinus) population structure and lake morphometry in Greenland – is there a connection? , 2000, Polar Biology.

[33]  R. Mason,et al.  Factors Controlling the Bioaccumulation of Mercury, Methylmercury, Arsenic, Selenium, and Cadmium by Freshwater Invertebrates and Fish , 2000, Archives of environmental contamination and toxicology.

[34]  J. Hammar.  Cannibals and parasites: conflicting regulators of bimodality in high latitude Arctic char, Salvelinus alpinus , 2000 .

[35]  K. Kidd.  USE OF STABLE ISOTOPE RATIOS IN FRESHWATER AND MARINE BIOMAGNIFICATION STUDIES , 1998 .

[36]  D. Mackay,et al.  Role of food web structure on lipid bioaccumulation of organic contaminants by lake trout (Salvelinus namaycush) , 1996 .

[37]  L. Johnson,et al.  Action Principles as Determinants of Ecosystem Structure: The Autonomous Lake as a Reference System , 1995 .

[38]  K. Hobson,et al.  Cannibalism and trophic structure in a high Arctic lake: insights from stable-isotope analysis , 1995 .

[39]  R. Hesslein,et al.  The influence of trophic level as measured by δ15N on mercury concentrations in freshwater organisms , 1995 .

[40]  B. Jonsson,et al.  Diet Differentiation in Polymorphic Arctic Charr in Thingvallavatn, Iceland , 1992 .

[41]  D. Andrews,et al.  The effects of an Arctic winter on benthic invertebrates in the littoral zone of Char Lake, Northwest Territories , 1985 .

[42]  M. Minagawa,et al.  Stepwise enrichment of 15N along food chains: Further evidence and the relation between δ15N and animal age , 1984 .

[43]  A. Mariotti.  Atmospheric nitrogen is a reliable standard for natural 15N abundance measurements , 1983, Nature.

[44]  C. Wren,et al.  Mercury Uptake by Lake Trout, Salvelinus namaycush, Relative to Age, Growth, and Diet in Tadenac Lake with Comparative Data from Other PreCambrian Shield Lakes , 1983 .

[45]  F. Rigler.  Limnology in the high Arctic: a case study of Char Lake: With 7 figures and 1 table in the text , 1978 .

[46]  Laurel R. Fox,et al.  Cannibalism in Natural Populations , 1975 .

[47]  R. Paine.  Natural History, Limiting Factors and Energetics of the Opisthobranch Navanax Inermis , 1965 .

[48]  H. Craig.  Isotopic standards for carbon and oxygen and correction factors for mass-spectrometric analysis of carbon dioxide , 1957 .

[49]  C. Rivers.  Applications , Considerations , and Sources of Uncertainty When Using Stable Isotope Analysis in Ecotoxicology , 2022 .