| transfer of ddt and metabolites from fruit orchard soils to american robins (turdus migratorius) twenty years after agricultural use of ddt in canada. | wildlife contamination studies found high levels of ddt and associated metabolites in bird eggs from canadian orchard sites during the early 1990s. the present study investigated local dietary uptake of ddt and geographic variability in tissue concentrations in the same orchards. a soil-earthworm-robin food chain was chosen for study, as early surveys showed that robins contained the highest levels of ddt of several avian species and because published research indicated that earthworms were a pr ... | 2000 | 10871424 |
| an assessment of ddt and other chlorinated compounds and the reproductive success of american robins (turdus migratonrius) breeding in fruit orchards. | although ddt was banned in the 1970s, american robins (turdus migratorius) breeding in fruit orchards of the okanagan valley, british columbia, continue to be contaminated with ddt and its metabolites. the objectives of our study were (1) to assess organochlorine (oc) contamination in robins breeding in okanagan orchards (1993-1995, 1997-1998) and (2) to determine if exposure affected reproductive success when compared to robins from non-orchard habitat (lower mainland, british columbia). robins ... | 2003 | 12739861 |
| migratory songbirds disperse ticks across canada, and first isolation of the lyme disease spirochete, borrelia burgdorferi, from the avian tick, ixodes auritulus. | during a 3-yr comprehensive study, 196 ixodid ticks (9 species) were collected from 89 passerine birds (32 species) from 25 localities across canada to determine the distribution of avian-associated tick species and endogenous lyme disease spirochetes, borrelia burgdorferi johnson, schmid, hyde, steigerwalt, and brenner. we report the following first records of tick parasitism on avian hosts: the rabbit-associated tick, ixodes dentatus marx, from manitoba and ontario; the mouse tick, ixodes muri ... | 2005 | 17089744 |
| use of observed wild bird activity on poultry farms and a literature review to target species as high priority for avian influenza testing in 2 regions of canada. | the risk of avian influenza outbreaks in poultry is partially dependent on the probability of contact between domestic poultry and wild birds shedding avian influenza (ai) virus. the major objective of this study was to document wild bird activity on poultry farms to determine which wild bird species should be targeted for ai surveillance in canada. we collected data in 2 major poultry producing regions of canada, southwestern ontario and the fraser valley of british columbia, on the relative ab ... | 0 | 22851777 |