A5007829095- Avian ecology and behavior
- Climate variability and models
- Wildlife Ecology and Conservation
- Rangeland and Wildlife Management
- Ecology and Vegetation Dynamics Studies
- Marine animal studies overview
- Fire effects on ecosystems
- Animal Behavior and Reproduction
- Species Distribution and Climate Change
- Land Use and Ecosystem Services
- Wildlife Conservation and Criminology Analyses
- Economic and Environmental Valuation
- Bird parasitology and diseases
Simon Fraser University
2012-2019
University of British Columbia
2009-2017
Forest Research
2012
Environment and Climate Change Canada
2009
Over the course of annual cycle, migratory bird populations can be impacted by environmental conditions in regions separated thousands kilometers. We examine how climatic during discrete periods cycle influence demography a nearctic-neotropical migrant population yellow warblers (Setophaga petechia), that breed western Canada and overwinter Mexico. demonstrate wind spring migration are best predictor apparent adult survival, male arrival date, female clutch initiation date and, via these...
We examined the impact of daily and severe multiday weather events on nest survival Horned Larks (Eremophila alpestris) Savannah Sparrows (Passerculus sandwichensis) breeding sympatrically in alpine habitat. The two species' thermal regimes varied. season was ∼2°C colder had more precipitation storms than that Sparrows, which initiated laying 2 wk later. was, average, 27% shorter Larks. Overall (DNS) similar for species, but failure due to abandonment (33% nests) (10%). Using Program MARK...
Logging often reduces taxonomic diversity in forest communities, but little is known about how this biodiversity loss affects the resilience of ecosystem functions. We examined partial logging and clearcutting temperate forests influenced functional birds that nest tree cavities. used point-counts a before-after-control-impact design to examine effects on value, range, density traits bird communities Canada (21 species) Chile (16 species). Clearcutting, not logging, reduced both systems. The...
ABSTRACT Although Savannah Sparrows (Passerculus sandwichensis) have been well studied across their North American range, few data are available for populations that breed in high-elevation habitats. We collected over six years on the demography of a population (P. s. anthinus) breeding alpine tundra and sub-alpine meadows northern British Columbia, Canada. The mean duration season at our site was 45.5 d, pairs produced maximum one brood per season. Clutch sizes varied annually (mean = 4.37,...
We studied the population ecology of Pacific Wrens (Troglodytes pacificus) in 2003 and 2004 breeding across elevations from 100 to 1,300 m coastal mountain forests southwestern British Columbia, Canada examine if this species is adapted upper montane subalpine habitats. found fewer territories at high elevation, a higher proportion unmated males, nests per mated male, no returns banded adults or juveniles. The season was 61% shorter (31 vs. 79 days), mass nestlings (at 11–12 days age) nest...
Latitudinal variation in avian life history strategies is well documented. Clutch size and nest success tend to increase with latitude, whereas longevity developmental periods have been argued decrease latitude. However, these patterns are largely based on interspecific comparisons of species breeding at tropical temperate latitudes. We compared the Yellow Warblers Setophaga petechia arctic habitat northern extent their range, Inuvik, NWT (68°N), Canada, those Revelstoke, BC (50°N), use data...
Brood parasitism by Brown-headed Cowbirds (Molothrus ater (Boddaert, 1783)) often reduces the reproductive success of their hosts. We examined whether ability females to avoid or mitigate costs brood improved with age in a population Yellow Warblers (Setophaga petechia (L., 1766)) breeding near Revelstoke, British Columbia, between 2004 and 2011. parasitized 18% Warbler nesting attempts rejected 24% nests, principally deserting nest initiating new attempt. found no evidence that older were...