Detroit River load estimation; the need for a new monitoring approach

Scavia, Donald; Calappi, Timothy J.

doi:10.1016/j.jglr.2023.05.007

Cited by 1 publication

(1 citation statement)

References 36 publications

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“…The Middle Bass Island (MBI) sampling site is located in the shallow and warmer western basin of Lake Erie, conditions that favor a warm-water walleye fishery. As such, the western basin is prone to episodes of harmful algal blooms (HABs - NOAA’s Bloom Severity Index), storm-driven sediment remobilization in shallow nearshore areas and riverine systems, ,,− and the climate-enhanced mechanism of biomass/contaminant food web dilution in the algal-rich western basin . The Dunkirk sampling site is in the deeper eastern basin of Lake Erie, with ecological conditions that favor cold-water lake trout populations.…”

Section: Resultsmentioning

confidence: 99%

Temporal Trends of Great Lakes Legacy Contaminants: Ecological and Biological Considerations Applying the Age-Trend Model

Pagano,

Garner

2024

Environ. Sci. Technol.

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The USEPA Great Lakes Fish Monitoring and Surveillance Program (GLFMSP) has been monitoring top predator lake trout and walleye contaminant concentrations since the early 1970s. Our research revealed that select legacy contaminant groups (∑PCBs, ∑DDTs, ∑chlordanes, and ∑5PBDEs) have similar t 1/2 and k 2 values across the Great Lakes, with the exception of both Lake Erie sites and the Lake Superior�Keweenaw Point site. The slower halving times determined at both Lake Erie sites are consistent with legacy contaminant remobilization due to extreme weather climate effects and past remedial actions on the Detroit River, whereas the Lake Superior�Keweenaw Point site demonstrates contaminant halving times approaching the exponential minimum. Overall, Great Lakes select contaminant groupings have decreased between 25.8 and 97.9% since 2004. An age-normalized Great Lakes Contaminant Index (GLCI) was devised, indicating both Lake Michigan sites as the most highly impacted. The mean absolute deviation statistic was applied, documenting the need to age-correct contaminant trends due to highly variable age profiles. With the noted exceptions, the uniformity of age-corrected trend modeling suggests that a combination of the fundamental biological and physicochemical mechanisms of natural contaminant sequestration, declining dissolved water concentrations, accumulation/metabolism/depuration, and the overall reduction of legacy contaminant loading are driving the generally consistent rates of declines in the Great Lakes. Many of the biological and ecological stressors currently associated with climate change appear to be accounted for by the age-trend model.

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