| spring migratory birds (aves) extend the northern occurrence of blacklegged tick (acari:ixodidae). | birds that had migrated northward across lake superior were captured upon reaching landfall at thunder cape (48 degrees 18' n, 88 degrees 56' w) at the southwestern tip of the sibley peninsula, northwestern ontario, from 9 may to 9 june 1995. twenty-one of 530 birds examined (6 of 55 species) had a total of 34 ticks; 1 blue jay, cyanocitta cristata, had a northern fowl mite, ornithonyssus sylviarum (canestrini & fanzago). four blacklegged tick, ixodes scapularis say, larvae were found on an amer ... | 1996 | 8699451 |
| 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 |
| a field validation of plasma metabolite profiling to assess refueling performance of migratory birds. | plasma metabolite profiling offers a potential means to assess stopover refueling performance of migratory birds from a single capture. however, this method has not previously been validated where site quality has been determined independently using analysis of capture data. we captured and blood sampled six passerine bird species refueling at known high-quality (base) and low-quality (tip) sites at long point, ontario, canada. plasma triglyceride, an indicator of fat deposition, was higher at t ... | 2005 | 15702470 |
| 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 |
| ecological risk assessment of lead contamination at rifle and pistol ranges using techniques to account for site characteristics. | spent ammunition at outdoor rifle and pistol (rp) firing ranges creates a characteristic pattern of contamination, whereby small areas surrounding backstop berms exhibit extremely high soil lead (pb) concentrations. we characterized sources, pathways and uncertainty in contaminant accumulation for receptors at two rp ranges in southeastern ontario. based on these results, we performed risk calculations using kriging to estimate risk across "worst-case" species foraging ranges. range-normalized h ... | 2007 | 17257653 |
| 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 |
| variation in the structure of bird nests between northern manitoba and southeastern ontario. | traits that converge in appearance under similar environmental conditions among phylogenetically independent lineages are thought to represent adaptations to local environments. we tested for convergence in nest morphology and composition of birds breeding in two ecologically different locations in canada: churchill in northern manitoba and elgin in southeastern ontario. we examined nests from four families of passerine birds (turdidae: turdus, parulidae: dendroica, emberizidae: passerculus and ... | 2011 | 21552515 |