Organochlorines and reproductive success of birds in orchard and non-orchard areas of central British Columbia, Canada, 1990?91

1994 ◽  
Vol 26 (4) ◽  
pp. 435-443 ◽  
Author(s):  
J. E. Elliott ◽  
P. A. Martin ◽  
T. W. Arnold ◽  
P. H. Sinclair
Keyword(s):  
British Columbia ◽  
Reproductive Success

Why breed early? A study of reproductive tactics in Peromyscus

1977 ◽  
Vol 55 (5) ◽  
pp. 862-871 ◽  
Author(s):  
Daphne J. Fairbairn
Keyword(s):  
British Columbia ◽  
Reproductive Success ◽  
Peromyscus Maniculatus ◽  
Frequent Occurrence ◽  
Deer Mice ◽  
Reproductive Tactics ◽  
Selection Pressures ◽  
Bimodal Pattern ◽  
Early Peak ◽  
Males And Females

Female deer mice (Peromyscus maniculatus) near Vancouver, British Columbia, were found to have a bimodal pattern of breeding. This paper compares the success of females that attempted to breed in the early peak of breeding with that of females that did not breed until the later breeding peak. While the average success was about the same for the two tactics, early breeding had a much higher variance. It is suggested that this difference in variances would result in eventual elimination of the early-breeding phenotype, unless it were favored by other factors. Differences in the selection pressures on males and females, and the relatively frequent occurrence of years of good reproductive success for early-breeding females, may contribute to the maintenance of this phenotype in the population. A hypothesis is presented to explain both the bimodality of the breeding pattern, and the dominance of the second breeding peak.

scholarly journals The relative contribution of individual quality and changing climate as drivers of lifetime reproductive success in a short-lived avian species

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Lisha L. Berzins ◽  
Russell D. Dawson ◽  
Christy A. Morrissey ◽  
Robert G. Clark
Keyword(s):  
British Columbia ◽  
Life History ◽  
Reproductive Success ◽  
Environmental Conditions ◽  
Avian Species ◽  
Life History Trait ◽  
Lifetime Reproductive Success ◽  
Positive Effects ◽  
Changing Climate ◽  
Animal Populations

AbstractAnimal populations are influenced strongly by fluctuations in weather conditions, but long-term fitness costs are rarely explored, especially in short-lived avian species. We evaluated the relative contributions of individual characteristics and environmental conditions to lifetime reproductive success (LRS) of female tree swallows (Tachycineta bicolor) from two populations breeding in contrasting environments and geographies, Saskatchewan and British Columbia, Canada. Female swallows achieved higher LRS by breeding early in the season and producing more fledglings. Other measures of female quality had virtually no influence on LRS. Genetic factors did not predict LRS, as there was no correlation between life-history components for sister pairs nor between mothers and their daughters. Instead, climate variability—indexed by spring pond density (i.e., abundance of wetland basins holding water) during years when females bred—had strong positive effects on female LRS in more arid Saskatchewan but only weak positive effects of moisture conditions were detected in wetter British Columbia. Overall, several life history trait correlates of LRS were similar between populations, but local environmental factors experienced by individuals while breeding produced large differences in LRS. Consequently, variable and extreme environmental conditions associated with changing climate are predicted to influence individual fitness of distinct populations within a species’ range.

Variable Reproductive Success of Bald Eagles on the British Columbia Coast

1998 ◽  
Vol 62 (2) ◽  
pp. 518 ◽  
Author(s):  
John E. Elliott ◽  
Ian E. Moul ◽  
Kimberly M. Cheng
Keyword(s):  
British Columbia ◽  
Reproductive Success ◽  
Bald Eagles

Reproductive success of Great Blue Herons in British Columbia

1985 ◽  
Vol 63 (5) ◽  
pp. 1110-1113 ◽  
Author(s):  
L. Scott Forbes ◽  
Keith Simpson ◽  
John P. Kelsall ◽  
Donald R. Flook
Keyword(s):  
United States ◽  
British Columbia ◽  
Reproductive Success ◽  
Western United States ◽  
Western Canada ◽  
Ardea Herodias ◽  
The Difference ◽  
Lower Variability

Great Blue Herons (Ardea herodias) in 14 colonies in southwestern British Columbia fledged a mean of 2.5 young per successful nest between 1977 and 1981; annual values varied by 12% around the 5-year mean, being highest in a dry spring and lowest in a wet spring. Herons in large colonies in British Columbia reared more young with lower variability in reproductive success than herons in small colonies, but not significantly so (p > 0.10). When data for all Canadian heronries were analyzed, the difference was significant (p < 0.05). Herons in western Canada reared more young than herons in the western United States (p < 0.025). Mortality in herons in western Canada was also higher than in herons in the western United States (p < 0.005).

Site Fidelity and Reproductive Success of Black Oystercatchers in British Columbia

Waterbirds ◽  
2001 ◽  
Vol 24 (2) ◽  
pp. 203 ◽  
Author(s):  
Stephanie L. Hazlitt ◽  
Robert W. Butler
Keyword(s):  
British Columbia ◽  
Reproductive Success ◽  
Site Fidelity
Sign in / Sign up

Export Citation Format

Share Document