| contaminants in eggs of colonial waterbirds and hepatic cytochrome p450 enzyme levels in pipped tern embryos, washington state. | eggs of forster's terns (sterna forsteri) collected in 1991 from nesting colonies on crescent island (columbia river) and the potholes reservoir in south central washington generally contained low residues of organochlorine pesticides and metabolites, 2,3,7, 8-tetrachlorodibenzo-p-dioxin, 2,3,7,8-tetrachlorodibenzofuran, and polychlorinated biphenyls (pcbs). hepatic cytochrome p450 enzyme activity in pipped embryos of forster's terns from the two colonies seemed unaffected by contaminants. at cr ... | 1998 | 9732482 |
| concentrations and time trends of polybrominated diphenyl ethers (pbdes) and polychlorinated biphenyls (pcbs) in aquatic bird eggs from san francisco bay, ca 2000-2003. | concentrations of polybrominated diphenyl ethers (pbdes) and polychlorinated biphenyls (pcbs) were measured in 169 avian eggs. we analyzed randomly collected eggs of two species of piscivorous birds: caspian tern (sterna caspia) (n=78) and forster's tern (sterna forsteri) (n=76). we also analyzed fail-to-hatch eggs from two species protected under the federal endangered species act of 1973, that breed in the san francisco bay region: the piscivorous california least tern (sterna antillarum brown ... | 2008 | 18466953 |
| use of fatty acid analysis to determine dispersal of caspian terns in the columbia river basin, usa. | lethal control, which has been used to reduce local abundances of animals in conflict with humans or with endangered species, may not achieve management goals if animal movement is not considered. in populations with emigration and immigration, lethal control may induce compensatory immigration, if the source of attraction remains unchanged. within the columbia river basin (washington, u.s.a.), avian predators forage at dams because dams tend to reduce rates of emigration of juvenile salmonids ( ... | 2011 | 21771078 |