Article Title
Date

“Meta-analysis” of Temporal Trends of Mercury in Arctic Wildlife

2012-03-09

Image showing summary of trends which are statistically significant or meet the data adequacy requirements | © ElsevierA statistically robust analysis of 83 time-series of mercury in Arctic biota across marine, freshwater, and terrestrial ecosystems revealed a clear west-to-east gradient in the recent occurrence of increasing mercury trends. Larger numbers and a higher proportion of biotic datasets showing more significant increases were found in the Canadian and Greenland region of the Arctic than in the Arctic region of the North Atlantic. Most of the increasing datasets were for marine species, especially marine mammals.  

This “meta-analysis” of temporal trend data collected over the past 20 to 30 years was carried out under the auspices of the Arctic Monitoring and Assessment Programme. Sampling locations ranged from Alaska in the west to northern Scandinavia in the east. No generally consistent trend was evident across tissues and species across the circumpolar Arctic.

Nineteen percent of the time-series were classified as "adequate,” defined as the number of actual monitoring years in a time-series being equal to or greater than the number of sampling years required to detect a 5% annual change in mercury concentrations. With an additional five years of data, 53% of the time-series are predicted to become adequate. The authors recommend continued monitoring by extension of existing time-series.

Source: Frank Rigét, Birgit Braune, Anders Bignert, Simon Wilson, Jon Aars, Erik Born, Maria Dam, Rune Dietz, Marlene Evans, Thomas Evans, Mary Gamberg, Nikolaus Gantner, Norman Green, Helga Gunnlaugsdóttir, Kurunthachalam Kannan, Robert Letcher, Derek Muir, Pat Roach, Christian Sonne, Gary Stern, Øystein Wiig. 2011. Temporal trends of Hg in Arctic biota, an update. Science of the Total Environment 409:3520-3526 DOI: 10.1016/j.scitotenv.2011.05.002      

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Contacts: Birgit Braune, 613-998-6694, Ecotoxicology and Wildlife Health Division | Derek Muir, 905-319-6921, Priority Substances Exposure Division | Robert Letcher, 613-998-6696, Ecotoxicology and Wildlife Health Division

Image Reprinted from Science of the Total Environment, Volume 409, Frank Rigét, Birgit Braune, Anders Bignert, Simon Wilson, Jon Aars, Erik Born, Maria Dam, Rune Dietz, Marlene Evans, Thomas Evans, Mary Gamberg, Nikolaus Gantner, Norman Green, Helga Gunnlaugsdóttir, Kurunthachalam Kannan, Robert Letcher, Derek Muir, Pat Roach, Christian Sonne, Gary Stern, Øystein Wiig, Temporal trends of Hg in Arctic biota, an update, 3520-3526, Copyright 2011, with permission from Elsevier.