Sources of mercury contamination in the sediments of small headwater lakes in south-central Ontario, Canada

1986 ◽  
Vol 15 (5) ◽  
pp. 505-512 ◽  
Author(s):  
R. Douglas Evans
Keyword(s):  
Mercury Contamination ◽  
South Central ◽  
Headwater Lakes

Factors influencing the achievement of steady state in mercury contamination among lakes and catchments of south-central Ontario

2009 ◽  
Vol 66 (2) ◽  
pp. 187-200 ◽  
Author(s):  
R. Brad Mills ◽  
Andrew M. Paterson ◽  
Jules M. Blais ◽  
David R.S. Lean ◽  
John P. Smol ◽  
...  
Keyword(s):  
Organic Matter ◽  
Steady State ◽  
Annual Runoff ◽  
Model Fit ◽  
Mercury Contamination ◽  
Positive Linear Relationship ◽  
South Central ◽  
Factors Influencing ◽  
Headwater Lakes ◽  
Drainage Ratio

Mercury (Hg) concentrations in recent (0.5–1 cm) and preindustrial (>30 cm) sediments were examined across lakes in south-central and eastern Ontario, Canada (45.53°N, 82.41°W to 44.15°N, 76.25°W), to determine whether Hg exported from watersheds is at steady state with atmospheric deposition. An examination of headwater lakes revealed that Hg enrichment was not uniform among watersheds but that the enrichment factor (EF = [Hg]present day/[Hg]preindustrial, standardized for organic matter) decreased as a function of drainage ratio (Ad /Ao, watershedarea/lakearea). Furthermore, the model fit was improved after accounting for differences in sulfate concentrations and pH among lakes: EF = (Ad /Ao)–15.96 – 0.07(SO 42– ) – (3.55(pH>8.3)) (R2 = 0.458, p = 0.0001). Hg concentrations in preindustrial sediments of headwater lakes showed a positive linear relationship with drainage ratio (partial t = 4.83, p < 0.0001, n = 66) that was strengthened following an adjustment for mean annual runoff (MAR) ([Hg]preindustrial = 0.011 ± 0.002(Ad /Ao) + 0.0008 ± 0.0003(MAR) (R2 = 0.108, F[1,66] = 8.01, p = 0.006)). Our results suggest that Hg export from watersheds may be currently lagging behind atmospheric Hg deposition, in which case, Hg export would increase into the future, even as Hg deposition from the atmosphere stabilizes.

Spatial patterns of mercury contamination and associated risk to piscivorous wading birds of the south central United States

2018 ◽  
Vol 38 (1) ◽  
pp. 160-166 ◽  
Author(s):  
Christopher T. Gerstle ◽  
Ray W. Drenner ◽  
Matthew M. Chumchal
Keyword(s):  
United States ◽  
Spatial Patterns ◽  
Mercury Contamination ◽  
Wading Birds ◽  
The South ◽  
South Central ◽  
Central United States

scholarly journals Effects of Mercury Deposition and Coniferous Forests on the Mercury Contamination of Fish in the South Central United States

2013 ◽  
Vol 47 (3) ◽  
pp. 1274-1279 ◽  
Author(s):  
Ray W. Drenner ◽  
Matthew M. Chumchal ◽  
Christina M. Jones ◽  
Christopher M. B. Lehmann ◽  
David A. Gay ◽  
...  
Keyword(s):  
United States ◽  
Mercury Contamination ◽  
Coniferous Forests ◽  
Mercury Deposition ◽  
The South ◽  
South Central ◽  
Central United States

Intertidal zonation patterns of macroinfauna over a range of exposed sandy beaches in south-central Chile

1993 ◽  
Vol 101 ◽  
pp. 105-118 ◽  
Author(s):  
E Jaramillo ◽  
A McLachlan ◽  
P Coetzee
Keyword(s):  
Sandy Beaches ◽  
Central Chile ◽  
South Central ◽  
Intertidal Zonation ◽  
Zonation Patterns
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