HR: 0800h
AN: B11B-0415    [Abstracts]
TI: Mercury cycling in agricultural and non-agricultural wetlands in the Yolo Bypass Wildlife Area, California: bioaccumulation in small fish
AU: * Ackerman, J T
EM: jackerman@usgs.gov
AF: USGS, USGS, Davis Field Station,Western Ecological Research Center, University of California, One Shields Ave., Davis, CA 95616, United States
AU: Eagles-Smith, C A
EM: ceagles-smith@usgs.gov
AF: USGS, USGS, Davis Field Station,Western Ecological Research Center, University of California, One Shields Ave., Davis, CA 95616, United States
AU: Miles, K A
EM: keith_miles@usgs.gov
AF: USGS, USGS, Davis Field Station,Western Ecological Research Center, University of California, One Shields Ave., Davis, CA 95616, United States
AU: Ricca, M A
EM: mark_ricca@usgs.gov
AF: USGS, USGS, Davis Field Station,Western Ecological Research Center, University of California, One Shields Ave., Davis, CA 95616, United States
AB: We examined the bioaccumulation of mercury in small fish within white rice, wild rice, and permanent wetland habitats at the Yolo Wildlife Area during the 2007 rice growing season. We introduced 30 mosquito fish in each of four cages placed at the inlet, center, and outlet (two cages) of each wetland in June, immediately after the white rice fields were re-flooded after being seeded. All fish were removed from their cages 60-days after their introduction, with the exception that ten fish from each of the second cages at the outlets were removed 30-days after introduction to assess temporal trends in mercury exposure. Mercury concentrations will be compared between fish that were introduced into cages and reference fish that originated from the same fish stock (Sacramento County Vector Control). We also measured fish length and mass both when they were introduced and collected to 1) control for growth effects on mercury bioaccumulation and 2) examine whether wetland habitat influenced growth rates. Fish are currently being analyzed for mercury and results will be available by the conference.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0491 Food webs and trophodynamics (4817)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting