2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2018 | 12:15 PM - 12:30 PM | EXPLORING BROAD-SCALE FISH MERCURY BIOACCUMULATION PATTERNS: ROLE OF GROWTH DILUTION IN A WARMING CLIMATE | 310 B
EXPLORING BROAD-SCALE FISH MERCURY BIOACCUMULATION PATTERNS: ROLE OF GROWTH DILUTION IN A WARMING CLIMATE
Bioaccumulation of mercury in fish is a complex process that varies in space and time. In this study, we avail a long-running (1970-2015) monitoring program from Ontario, Canada to better understand spatiotemporal variations in fish mercury bioaccumulation. Focussing on Walleye and Northern Pike, the data were first stratified by latitudinal zones and temporal periods. A series of LMEMs with latitudinal zone, time period, and their interactions as random effects were used to capture the spatial, temporal, and spatiotemporal variations in mercury bioaccumulation. The random slopes were used to define bioaccumulation index and capture trends in space and time. Growth dilution in conjunction with estimated rates of warming for different latitudinal zones failed to explain the spatiotemporal trends. Temporal trends showed contrasting patterns with bioaccumulation increasing in Pike and decreasing in Walleye, suggesting temperature-driven growth dilution is more likely in Walleye. A space-for-time substitution revealed the presence of a weak growth dilution, but it was not attributable to temperature differences. Overall, the study summarizes broad-scale variations in fish mercury levels and sheds light on the role of growth dilution in a warming climate.
- Pollution
- Spatial
- Climate Change
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Presenters/Authors
Shyam Thomas
(), Ryerson University, shyam.thomas@ryerson.ca;
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Stephanie Melles
(), Ryerson University, stephanie.melles@ryerson.ca;
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Satyendra Bhavsar
(), Ontario Ministry of the Environment and Climate Change, Toronto, satyendra.bhavsar@ontario.ca;
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