LONG-TERM AND LARGE-SCALE TRENDS IN MERCURY BIOACCUMULATION SUWANNEE RIVER BASIN, FLORIDA.

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Presentation transcript:

LONG-TERM AND LARGE-SCALE TRENDS IN MERCURY BIOACCUMULATION SUWANNEE RIVER BASIN, FLORIDA

Lia C. Chasar Environmental Sciences Institute Florida A & M University United States Geological Survey National Water Quality Assessment Program Florida Integrated Science Center Ted R. Lange Florida Freshwater Fish and Conservation Commission

Primary Study Objective To investigate the effects of source strength, cycling, and food web interactions on the bioaccumulation of mercury in stream ecosystems USGS National Water Quality Assessment Program (NAWQA) Bioacumulation of Mercury in Stream Ecosystems

Penaeid shrimp Gray Snapper Blacktip Shark Schooner Bank Florida Bay Atwell, L. et al Can. J. Fish. Aquat. Sci. 55: Adapted by Robin Stewart, USGS, Menlo Park  15 N=5. 5  15 N9.5 Food web complexity ↑trophic level ≈ ↑  15 N ≈ ↑Hg burden

Questions Stable isotopes useful in establishing trophic relationships in riverine systems? –surface water run-off –tributaries –sharp gradients in water chemistry and productivity

Questions Stable isotopes useful in establishing trophic relationships in riverine systems? –surface water run-off –tributaries –sharp gradients in water chemistry and productivity Influence of local biogeochemical processes on bioaccumulation of contaminants (sp. Mercury) in riverine systems? –i.e. variability within a river reach vs. entire basin?

Drivers for fluctuations? (no apparent change in atm. dep.)

Questions Stable isotopes useful in establishing trophic relationships in riverine systems? –surface water run-off –tributaries –sharp gradients in water chemistry and productivity Influence of local biogeochemical processes on bioaccumulation of contaminants (sp. Mercury) in riverine systems? –i.e. variability within a river reach vs. entire basin? What drives temporal trend in mercury body burden of fish in Suwannee River basin?

The Suwannee River Basin (courtesy of Suwannee River Water Management District) Gulf of Mexico Georgia Florida Suwannee River Santa Fe River Withlacoochee River Alapaha River ,

River mile upstream from mouth of Suwannee River r 2 =0.89 r 2 =0.68

Role of Trophic Complexity?

 15 N only slight decrease with distance upstream Mean  15 N = 5.04 (±1.19)‰ Carbon Nitrogen

Transport/transformation? (pH, DOC vary in both space and time)

Conclusions THg body burden in all three consumers has experienced decrease since 1987, however values have peaked repeatedly THg increases with increasing distance upstream for crayfish, redbreast sunfish and largemouth bass Stable isotopes indicate that local biogeochemical processes and mercury transport/transformation are likely more important than trophic level shifts in mercury bioaccumulation

What’s next?

importance of water level –natural variability seasonal wetting/drying river margins –extreme events extended drought flooding forcing factors –pH –DOC –additional Hg loading moving further downstream –continue decrease? –estuary as mixing zone? pH, quality of DOC, SO 4 - resource management –temporal trends/advisories Future Research:

Project Support Florida Department of Environmental Protection Florida Fish and Wildlife Conservation Commission US Geological Survey Florida State University Washington State University Additional Acknowledgements FDEP Kerry Tate Tom Atkeson Don Axelrad FFWCC Doug Richards Beth Sargent WSU Ray Lee USGS Terry Petrosky Lori Lewis Lookin’ for bugs in all the wrong places…