Mercury accumulation in the fish community of a sub‐Arctic lake in relation to trophic position and carbon sources

Summary 1 Stable isotope analysis has improved understanding of trophic relationships among biota. Coupled with contaminant analysis, stable isotope analysis has also been used for tracing the pattern and extent of biomagnification of contaminants in aquatic food webs. 2 Combined analysis of nitrogen (δ 15 N) and carbon (δ 13 C) isotopes from fish species in a sub-Arctic lake were related to tissue mercury (Hg) concentrations to assess whether carbon sources influenced Hg accumulation in fish, in addition to trophic position. 3 Statistical models were used to estimate Hg biomagnification and uptake, to elucidate Hg accumulation dynamics and to appraise the relative importance of Hg exposure routes for the fish species. 4 Species Hg contamination increased as a function of trophic position (δ 15 N) and was inversely related to the δ 13 C signature. Species connected to the benthic food chain had lower Hg concentrations than species connected to the pelagic food chain. Species undergoing ontogenetic dietary shifts with increasing size, e.g. lake trout Salvelinus namaycush , also showed increased Hg concentrations with increasing reliance on pelagic fish as prey. 5 The results indicate that both vertical (trophic) and horizontal (habitat) food web structure influence Hg concentrations in fish tissue. 6 The biomagnification and uptake models indicated that contamination at the base of the food chain in the lake exceeded estimates for more southerly environments, thereby demonstrating the importance of dietary and water column Hg exposure routes in the sub-Arctic for determining Hg concentrations in fish. 7 Overall, the data reported here demonstrate how a combination of ecological concepts (food webs), developing ecological methods (stable isotopes) and environmental geochemistry can combine profitably to indicate the risks of exposure to environmental contaminants. Additional studies of the dynamics of Hg accumulation in the food webs of sub-Arctic lakes are needed, particularly in the light of the estimated high biomagnification rates and the heavy reliance of Inuit communities on subsistence fish harvests.

[1]  R. Smith,et al.  Bioaccumulation and biomagnification of mercury in Lake Murray, Papua New Guinea , 2001 .

[2]  K. J. Scott,et al.  Bioavailable Mercury in Arctic Snow Determined by a Light-Emitting mer-lux Bioreporter , 2001 .

[3]  M. Hutcheson,et al.  Fish mercury distribution in Massachusetts, USA lakes , 1999 .

[4]  K. Kidd,et al.  Spatial and temporal trends of contaminants in Canadian Arctic freshwater and terrestrial ecosystems: a review. , 1999, The Science of the total environment.

[5]  R. Furness,et al.  Stable isotopes indicate the extent of freshwater feeding by cormorants Phalacrocorax carbo shot at inland fisheries in England , 1999 .

[6]  R. Verdon,et al.  Mercury in Fish of Natural Lakes of Northern Québec , 1999 .

[7]  A. Tremblay,et al.  Mercury Accumulation in Fish from the La Grande Complex: Influence of Feeding Habits and Concentrations of Mercury in Ingested Prey , 1999 .

[8]  Alain Tremblay,et al.  Bioaccumulation of Mercury and Methylmercury in Invertebrates from Natural Boreal Lakes , 1999 .

[9]  J. Lester,et al.  Mercuty in Precipitation and Its Relation to Bioaccumulation in Fish: A Literature Review , 1998 .

[10]  J. Rasmussen,et al.  Application of Stable Isotope Techniques to Trophic Studies of Age‐0 Smallmouth Bass , 1998 .

[11]  W. Sunda,et al.  Processes regulating cellular metal accumulation and physiological effects : Phytoplankton as model systems , 1998 .

[12]  R C Back,et al.  Bioaccumulation of mercury in pelagic freshwater food webs. , 1998, The Science of the total environment.

[13]  J. Goering,et al.  Natural isotope indicators of fish migration at Prudhoe Bay, Alaska , 1998 .

[14]  K. Hobson,et al.  Biomagnification and bioaccumulation of mercury in an arctic marine food web: insights from stable nitrogen isotope analysis , 1998 .

[15]  Reed C. Harris,et al.  Temperature, growth and dietary effects on fish mercury dynamics in two Ontario lakes , 1998 .

[16]  C Cox,et al.  Mercury in Fish , 1998, Science.

[17]  T. A. Jackson.  Long-range atmospheric transport of mercury to ecosystems, and the importance of anthropogenic emissionsa critical review and evaluation of the published evidence , 1997 .

[18]  Reed C. Harris,et al.  Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir , 1997 .

[19]  M. Lucotte,et al.  Contribution of suspended particulate matter and zooplankton to MeHg contamination of the food chain in midnorthern Quebec (Canada) reservoirs , 1997 .

[20]  A. Tremblay,et al.  Total Mercury and Methylmercury Contents of Insects from Boreal Lakes: Ecological, Spatial and Temporal Patterns , 1996 .

[21]  J. Rasmussen,et al.  A Trophic Position Model of Pelagic Food Webs: Impact on Contaminant Bioaccumulation in Lake Trout , 1996 .

[22]  K. Hobson,et al.  Influence of Trophic Position and Feeding Location on Contaminant Levels in the Gulf of the Farallones Food Web Revealed by Stable Isotope Analysis , 1996 .

[23]  R. Hesslein,et al.  Contributions of Benthic Algae to Lake Food Webs as Revealed by Stable Isotope Analysis , 1995, Journal of the North American Benthological Society.

[24]  G. M. Richardson,et al.  Does acid rain increase human exposure to mercury? A review and analysis of recent literature , 1995 .

[25]  J. Pennanen,et al.  Heavy metals in perch (Perca fluviatilis L.) from two acidified lakes in the salpausselkä esker area in Finland , 1995 .

[26]  Jonathan P. Kim.  Methylmercury in rainbow trout (Oncorhynchus mykiss) from Lakes Okareka, Okaro, Rotomahana, Rotorua and Tarawera, North Island, New Zealand , 1995 .

[27]  C. Hillaire‐Marcel,et al.  Anthropogenic mercury enrichment in remote lakes of northern Québec (Canada) , 1995 .

[28]  W. Shilts,et al.  Mercury anomalies in lake water and in commercially harvested fish, Kaminak Lake area, district of Keewatin, Canada , 1995 .

[29]  E. A. Henry,et al.  Total mercury and methylmercury mass balance in an alkaline, hypereutrophic urban lake (Onondaga Lake, NY) , 1995 .

[30]  D. Becker,et al.  Distribution of mercury in the aquatic food web of Onondaga Lake, New York , 1995 .

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

[32]  P. Wilkinson,et al.  Current and historical inputs of mercury to high-latitude lakes in Canada and to Hudson Bay , 1995 .

[33]  David W. Schindler,et al.  The effects of ecosystem characteristics on contaminant distribution in northern freshwater lakes , 1995 .

[34]  C. Langlois,et al.  Presence of airborne contaminants in the wildlife of northern Québec. , 1995, The Science of the total environment.

[35]  J. Rasmussen,et al.  Modelling food chain structure and contaminant bioaccumulation using stable nitrogen isotopes , 1994, Nature.

[36]  C. Rolff,et al.  Potential biomagnification of PCDD/Fs - new possibilities for quantitative assessment using stable isotope trophic position , 1993 .

[37]  J. Rudd,et al.  Mercury Concentrations in Fish Related to Size of Remote Canadian Shield Lakes , 1993 .

[38]  N. Bloom,et al.  Mercury and methylmercury, in individual zooplankton: Implications for bioaccumulation , 1992 .

[39]  G. Kling,et al.  Stable Isotopes and Planktonic Trophic Structure in Arctic Lakes , 1992 .

[40]  J. Hobbie,et al.  Using ratios of stable nitrogen isotopes to estimate bioaccumulation and flux of polychlorinated dibenzo‐p‐dioxins (PCDDs) and dibenzofurans (PCDFs) in two food chains from the Northern Baltic , 1992 .

[41]  R. Furness,et al.  Historical Changes in Mercury Concentrations in the Marine Ecosystem of the North and North-East Atlantic Ocean as Indicated by Seabird Feathers , 1992 .

[42]  F. Slemr,et al.  Increase in global atmospheric concentrations of mercury inferred from measurements over the Atlantic Ocean , 1992, Nature.

[43]  R. Furness,et al.  Mercury accumulation in great shuas Catharacta skua of known age and sex, and its effects upon breeding and survival , 1991 .

[44]  T. Meyers,et al.  Atmospheric concentrations and deposition of Hg to A deciduous forest atwalker branch watershed, Tennessee, USA , 1991 .

[45]  Kjell Johansson,et al.  Mercury in swedish forest soils and waters — Assessment of critical load , 1991 .

[46]  G. Mierle,et al.  The role of humic substances in the mobilization of mercury from watersheds , 1991 .

[47]  J. Carey,et al.  Food chain structure in Ontario Lakes determines PCB levels in lake trout (Salvelinus namaycush) and other pelagic fish , 1990 .

[48]  T. B. Sheffy,et al.  Factors Influencing Mercury Concentrations in Walleyes in Northern Wisconsin Lakes , 1990 .

[49]  C. Driscoll,et al.  Factors affecting mercury accumulation in fish in the upper michigan peninsula , 1990 .

[50]  L. Håkanson,et al.  Mercury in fish in Swedish lakes — Linkages to domestic and European sources of emission , 1990 .

[51]  Robert J. Wootton,et al.  Ecology of Teleost Fishes , 1989, Springer Netherlands.

[52]  B. Fry,et al.  δ13C Measurements as Indicators of Carbon Flow in Marine and Freshwater Ecosystems , 1989 .

[53]  D. Rice,et al.  Stable isotope ratios and contaminant concentrations in a sewage-distorted food web , 1989 .

[54]  J. Nriagu,et al.  Quantitative assessment of worldwide contamination of air, water and soils by trace metals , 1988, Nature.

[55]  L Håkanson,et al.  Mercury in fish in Swedish lakes. , 1988, Environmental pollution.

[56]  M. Roth.  A quantitative assessment , 1987 .

[57]  B. Peterson,et al.  STABLE ISOTOPES IN ECOSYSTEM STUDIES , 1987 .

[58]  R. D. Evans.  Sources of mercury contamination in the sediments of small headwater lakes in south-central Ontario, Canada , 1986 .

[59]  S. Rekolainen,et al.  Organic and inorganic mercury in the food chain of some lakes and reservoirs in Finland , 1986 .

[60]  P. Johansen,et al.  The effects of feeding ecology on mercury accumulation in walleye (Stizostedion vitreum) and pike (Esox lucius) in Lake Simcoe , 1985 .

[61]  R. Howarth,et al.  Multiple Stable Isotopes Used to Trace the Flow of Organic Matter in Estuarine Food Webs , 1985, Science.

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

[63]  F. Beamish,et al.  Water Quality Modifies Uptake of Waterborne Methylmercury by Rainbow Trout, Salmo gairdneri , 1983 .

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

[65]  R. Hesslein,et al.  Fates of metal radiotracers added to a whole lake: accumulation in slimy sculpin (Cottus cognatus) and white sucker (Catostomus commersoni). , 1983, The Science of the total environment.

[66]  Norman R. Draper,et al.  Applied regression analysis (2. ed.) , 1981, Wiley series in probability and mathematical statistics.

[67]  C. Mcroy,et al.  Food-Web structure and the fractionation of Carbon isotopes in the bering sea , 1979 .

[68]  M. J. Deniro,et al.  Influence of Diet On the Distribtion of Nitrogen Isotopes in Animals , 1978 .

[69]  M. Hendzel,et al.  Determination of mercury in fish. , 1976, Analytical chemistry.

[70]  W. B. Scott,et al.  Freshwater fishes of Canada , 1974 .

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

[72]  M. Dunbar,et al.  Contribution to the Study of the Fishes of Ungava Bay , 1952 .