SS4.02 The Role of Microbiology in Trace Metal and Organic Contaminant Cycling in Aquatic Systems
Date: Wednesday, June 12, 2002
Location: Poster Session - VCC
 
KainzM, Department of Biology, University of Victoria, Victoria, Canada, mkainz@uvic.ca
Mazumder, A, , Department of Biology, University of Victoria, Victoria, Canada, mazumder@uvic.ca
Telmer, K, , School of Earth and Ocean Sciences, University of Victoria, Victoria, Canada, ktelmer@uvic.ca
Gabriel, L, , Department of Biology, University of Victoria, Victoria, Albania, lgabriel@uvic.ca
 
MERCURY DYNAMICS IN ZOOPLANKTON FROM DRINKING WATER RESERVOIRS AND NATURAL LAKES ON VANCOUVER ISLAND
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The ingestion of food is generally accepted to be the dominant pathway of mercury (Hg) to zooplankton and fish. We investigate annual Hg dynamics in zooplankton of natural lakes and drinking-water reservoirs on Vancouver Island. The goal of this study is to examine the association between total mercury (THg) and methyl mercury (MeHg) concentrations and ingested food of starved and unstarved zooplankton of different body sizes (i.e. > 500, > 200, > 100 mm). Preliminary results indicate that zooplankton from drinking water reservoirs contain generally less MeHg than zooplankton from natural lakes. This pattern coincides with concentrations of dissolved organic carbon (DOC) and chlorophyll-a (chl-a) in the water column. Ongoing studies are identifying the origin and quantity of diet components in zooplankton from all size fractions through analysis of fatty acid biomarkers.