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USGS at The Wildlife Society: From sea-ice change to contaminants to predators and prey

ns best suited for conditions that no longer apply. Douglas H. Johnson, Session 46, Sept. 27, 9-9:20 a.m.

Mercury exposure in California black rails in San Francisco Bay:

Little is known of the ecology of secretive or special status species such as the California black rail, but mercury contamination in San Francisco Bay may degrade the value of existing or restored tidal marshes for these species. Understanding the relationships of resident species such as black rails and risk of methylmercury (a more toxic form of mercury) exposure will aid in the restoration and management of tidal wetlands at San Francisco Bay. To determine movements and food habits of black rails in relation to mercury and methylmercury exposure, scientists radio-tracked black rails at three independent tidal marsh sites in northern San Francisco Bay in spring and summer 2005 and 2006, and collected blood and feathers and invertebrate food prey for mercury and methylmercury analyses. Danika Tsao Melcer will discuss what was learned from the radio-tracking efforts and contaminants analyses. Danika Tsao Melcer, Session 40, Tuesday, Sep 26, 2006, 2:00 - 2:20 p.m.


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Contact: Catherine Puckett
cpuckett@usgs.gov
352-264-3532
United States Geological Survey
25-Sep-2006


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