| heavy metals and selenium in grebe eggs from agassiz national wildlife refuge in northern minnesota. | metal levels in eggs can often be used as an indicator of exposure and of potential effects. in previous work at agassiz national wildlife refuge, northwestern minnesota, the levels of several heavy metals were shown to be significantly higher in the eggs of eared grebes (podiceps nigricollis) compared to those in the eggs of franklin's gulls (larus pipixcan), black-crowned night-herons (nycticorax nycticorax) and double-crested cormorants (phalacrocorax auritus, except for mercury). in the pres ... | 2005 | 16418918 |
| selenium and metal concentrations in waterbird eggs and chicks at agassiz national wildlife refuge, minnesota. | exceptionally high cadmium (cd) and chromium (cr) concentrations were reported in eggs, feathers, or livers of selected waterbird species nesting at agassiz national wildlife refuge (agassiz) in 1994. ten- to 15-day-old franklin's gull (larus pipixcan), black-crowned night-heron (nycticorax nycticorax), and eared grebe (podiceps nigricollis) chicks were collected in 1998, 1999, and 2001 at agassiz and analyzed for selenium (se) and metals including cd and cr. freshly laid eggs were collected in ... | 2007 | 17464443 |
| heavy metals and selenium in grebe feathers from agassiz national wildlife refuge in northern minnesota. | metal levels in feathers can often be used as an indicator of exposure and of potential effects in birds. in previous work at agassiz national wildlife refuge, northwestern minnesota, pied-billed grebe (podilymbus podiceps) eggs had significantly higher levels of manganese and mercury and significantly lower levels of selenium than eared (podiceps nigricollis) or red-necked grebes (podiceps grisegena), but in 1999, pied-billed grebes had significantly higher levels of mercury, but lower levels o ... | 2007 | 17657451 |