GEOGRAPHIC AND SEASONAL VARIATION IN MERCURY EXPOSURE OF THE DECLINING RUSTY BLACKBIRD.

The article offers a study on the geographical and seasonal differences in the levels of mercury concentrations in the blood and feathers of rusty blackbirds (Euphagus carolinus) in several North American regions. It says that mercury concentrations in bloods and feathers of birds in Acadian forests were higher than those of the western boreal forests of Alaska and wintering areas in the U.S. Moreover, it states that wintering birds have lower blood mercury levels than those of breeding birds.