| selenium concentrations in greater scaup and dreissenid mussels during winter on western lake ontario. | one hypothesis for the decline of the north american greater (aythya marila) and lesser (a. affinis) scaup population is that contaminant burdens acquired on wintering or staging areas impair reproduction or cause lethal or sublethal health effects. recent studies have found increased selenium (se) concentrations in scaup but have focused on the fall and spring staging periods. from january to march 2006 and december to march 2006 and 2007, we analyzed liver tissues collected from greater scaup ... | 2011 | 21120462 |