Temporal and spatial trends of organochlorines and mercury in fishes from the St. Clair River/Lake St. Clair corridor, Canada

Gewurtz, Sarah B.; Bhavsar, Satyendra P.; Jackson, Donald A.; Fletcher, Rachael; Awad, Emily; Moody, Rusty; Reiner, Eric J.

doi:10.1016/j.jglr.2009.12.008

Cited by 43 publications

(22 citation statements)

References 42 publications

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“…In order to account for the influence of length, fish within a limited size range were included into the analysis similar to other contaminant trend studies French et al, 2006;Gewurtz et al, 2010). For lake trout and walleye, size ranges of 55-65 and 45-55 cm were used, respectively, to be consistent with those employed by in their evaluation of PCBs in the Great Lakes.…”

Section: Discussionmentioning

confidence: 99%

Trends of legacy and emerging-issue contaminants in Lake Simcoe fishes

Gewurtz

Bhavsar

Jackson

et al. 2011

Journal of Great Lakes Research

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Section: Discussionmentioning

confidence: 99%

Trends of legacy and emerging-issue contaminants in Lake Simcoe fishes

Gewurtz

Bhavsar

Jackson

et al. 2011

Journal of Great Lakes Research

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“…Numerous studies of Hg in fish have been carried out on the Great Lakes (e.g. Goulet et al 2007;Hogan et al 2007;Bhavsar et al 2010;Gewurtz et al 2010). These studies are relevant to Herring Gull research as the main route of exposure is through its diet (Scheuhammer et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Current concentrations and spatial and temporal trends in mercury in Great Lakes Herring Gull eggs, 1974–2009

et al. 2011

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Current concentrations and spatial and temporal trends of total mercury (Hg) were assessed in eggs of the Herring Gull (Larus argentatus) over the period 1974-2009 at 15 sites in the Great Lakes: 2-3 sites per lake and one site in each of 3 connecting channels. Current (2009) concentrations ranged from 0.064 μg/g (wet weight) at Chantry Island (Lake Huron) to 0.246 μg/g at Middle Island (Lake Erie). There were significant inter-colony differences in mean Hg concentrations (2005-2009). Mercury concentrations at 14 of 15 sites declined from 23 to 86% between when it was first measured (usually 1974) and 2009. Declining temporal trends over the entire period (1974-2009) were significant at 10 of the 15 sites. On the other hand, there were no significant trends in mercury over the last 15 years. In the early years, declines of Hg in Herring Gull eggs tracked those in Rainbow Smelt (Osmerus mordax) in most Great Lakes. More recently, declines in gull eggs were more evident than in smelt and may be partially explained by temporal changes in the gull diet. When gull Hg data were adjusted for temporal changes in the gull diet, as inferred from stable nitrogen isotope values in eggs, significant declines in egg mercury levels were found only at 4 of 15 sites. Overall, Hg concentrations have declined in Great Lakes Herring Gull eggs over the period 1974-2009 but changes in the gull diet may be contributing, in part, to those declines. Examination of contaminant temporal trends in multiple indicator species will ensure accurate inferences regarding contaminant availability in the environment.

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“…A similar pattern was observed for juvenile spottail shiners when tissue concentrations in fish collected from stations downstream of historical industrial sources were compared to those in fish collected upstream of sources (Sarnia Bay). Furthermore, tissue concentrations for Hg, OCS and HCB in juvenile spottail shiners collected from the St. Clair River were significantly greater than concentrations in fish collected from Lake Huron and Lake St. Clair (Gewurtz et al, 2010). Unlike sport fish that can travel large distances (e.g.…”

Section: Comparisons Of Estimated Vs Measured Invertebrate Methyl Hgmentioning

confidence: 85%

“…Current Hg levels in average sized walleye (and yellow perch) collected from the St. Clair River were elevated above the fish consumption limit guideline (N260 ppb) for the sensitive population and concentrations in larger sized walleye (N60 cm) as well as yellow perch (N30 cm) have caused further restrictions for the sensitive and general populations (Gewurtz et al, 2010). For walleye, the first consumption guideline for the general population (N520 ng/g) was exceeded in 82% of individual fish and concentrations approached the total restriction guidelines for the general population (1.84 μg/g) (Gewurtz et al, 2010).…”

Section: Comparisons Of Estimated Vs Measured Invertebrate Methyl Hgmentioning

confidence: 97%

“…Mercury data for walleye for the St. Clair River and Lake St. Clair (collected through the Ontario Sport Fish Contaminant Monitoring Program) dating back to 1976 showed that concentrations have declined through time in general. However, after the mid 1980s the rate of contaminant decline has decreased (Gewurtz et al, 2010). Gewurtz et al suggested that should this trend persist, it will be difficult to reduce Hg concentrations in walleye below the first guideline (women of child-bearing age and children under 15 years of age: 260 ppb, MOE, 2007).…”

Section: Introductionmentioning

confidence: 99%

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