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- Title
Thirty-Year Time Series of PCB Concentrations in a Small Invertivorous Fish ( Notropis Hudsonius): An Examination of Post-1990 Trajectory Shifts in the Lower Great Lakes.
- Authors
French, Todd D.; Petro, Steve; Reiner, Eric J.; Bhavsar, Satyendra P.; Jackson, Donald A.
- Abstract
The production and use of polychlorinated biphenyls (PCBs) have been restricted in North America since the 1970s; yet, PCBs are still detected in all components of the Great Lakes ecosystems. Our objective was to determine how total PCB (PCB) concentrations in spottail shiner ( Notropis hudsonius) changed over the period 1975-2007 in the lower Great Lakes. Trends were best described by three basic models: (1) piecewise models where concentrations followed a decreasing trend before the break point ( T) and an increasing trend post- T (Lake St. Clair, eastern Lake Erie, and upper Niagara River); (2) piecewise models where concentrations decreased both pre- and post- T but where the rate of decline post- T was less than that pre- T (western Lake Erie and Niagara River's Tonawanda Channel); and (3) linear models where concentrations declined at a constant rate across the entire temporal range (lower Niagara River and western Lake Ontario). Piecewise models best described the trends in shallow areas that are susceptible to full water-column mixing whereas constant-slope models best described trends in deeper areas. For piecewise models, T typically occurred during the years 1988-1992. Two events coincided with this timing: (1) a sustained shift towards warming summer temperatures and (2) the proliferation of dreissenid mussels ( Dreissena spp.). The weight-of-evidence suggests that the dreissenid invasions were a more likely driving factor behind the observed trends.
- Subjects
NORTH America; EFFECT of chemicals on fishes; POLYCHLORINATED biphenyls &; the environment; BIOTIC communities; RESEARCH methodology
- Publication
Ecosystems, 2011, Vol 14, Issue 3, p415
- ISSN
1432-9840
- Publication type
Article
- DOI
10.1007/s10021-011-9419-9