| avian influenza virus h13 circulating in ring-billed gulls (larus delawarensis) in southern ontario, canada. | avian influenza virus (aiv) was studied in ring-billed gulls (larus delawarensis) in one breeding colony on lake erie in 2000, and two on lake ontario in both 2000 and 2004. antibodies to h13 aiv were detected in 92% of adults in 2000 and 82% in 2004. antibody prevalence in 3-wk-old chicks was 5%-30% (overall 15%) in 2000 and 21% and 76% (overall 48%) in 2004. in 5-wk-old chicks, antibody prevalence was 23%-75% (overall 53%) in 2000 and 53% and 79% (overall 66%) in 2004. geometric mean antibody ... | 2010 | 20521671 |
| tracking the history and ecological changes of rising double-crested cormorant populations using pond sediments from islands in eastern lake ontario. | in the laurentian great lakes region, the double-crested cormorant (phalacrocorax auritus) has seen a thousand-fold population increase in recent decades. these large colonies of birds now often conflict with socioeconomic interests, particularly due to perceived competition with fisheries and the destruction of terrestrial vegetation in nesting habitats. here we use dated sediment cores from ponds on islands in eastern lake ontario that receive waste inputs from dense colonies of cormorants and ... | 2015 | 26214177 |
| organochlorine poisoning of ring-billed gulls in southern ontario. | clinical, necropsy, bacteriologic, parasitologic, histopathologic, toxicologic and animal inoculation studies suggest that organochlorine (pbc, dieldrin and dde) poisoning was an important factor in causing deaths of free-flying ring-billed gulls (larus delawarensis) in southern ontario in 1969 and 1973. the brains of gulls dying with clinical signs of neurologic involvement, and dead gulls with no other apparent cause of death, contained organochlorine residues of significantly greater levels t ... | 1977 | 410957 |