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

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.

Invasion of an exotic forb impacts reproductive success and site fidelity of a migratory songbird

Oecologia ◽  
2006 ◽  
Vol 149 (2) ◽  
pp. 340-351 ◽  
Author(s):  
Yvette Katina Ortega ◽  
Kevin Scot McKelvey ◽  
Diana Lee Six
Keyword(s):  
Reproductive Success ◽  
Site Fidelity ◽  
Migratory Songbird

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.

The terrestrial breeding biology of the ranid rock frog Nannophrys ceylonensis

Behaviour ◽  
2004 ◽  
Vol 141 (7) ◽  
pp. 899-913 ◽  
Author(s):  
◽  
◽  
◽  
Keyword(s):  
Reproductive Success ◽  
Parental Care ◽  
Site Fidelity ◽  
Nest Site ◽  
Hatching Success ◽  
Paternal Care ◽  
Adult Males ◽  
Nest Sites ◽  
Nest Site Fidelity ◽  
Males And Females

Abstract Nannophrys ceylonensis (Ranidae) is a terrestrial breeding anuran, found on wet vertical or near-vertical rock surfaces. Non-breeding adult males and females take refuge in separate crevices in the rock surfaces during the day and emerge at night to forage. Males can be polygynous; mating takes place inside crevices. Fathers exhibit paternal care for multiple clutches of eggs and guard eggs from predators. Paternal care of this species is obligatory; hatching success decreases without it. Females do not contribute to parental care. Males show nest site fidelity and defend territories against conspecifics. A scarcity of suitable nest sites may limit reproductive success in N. ceylonensis. Larvae hatch at Gosner stages 21-22 and leave their nests at stages 24-25 to live as truly terrestrial tadpoles, foraging on the rock surfaces near their natal nests.

scholarly journals Factors influencing variation in site fidelity of woodland caribou (Rangifer tarandus caribou) in southeastern British Columbia

2020 ◽  
Author(s):  
Heiko Wittmer ◽  
B McLellan ◽  
F Hovey
Keyword(s):  
British Columbia ◽  
Site Fidelity ◽  
Rangifer Tarandus ◽  
Snow Accumulation ◽  
Limiting Factors ◽  
Late Winter ◽  
Behavioural Plasticity ◽  
Rangifer Tarandus Caribou ◽  
Early Winter ◽  
Woodland Caribou

Where predation is a major limiting factor, it has been postulated that woodland caribou (Rangifer tarandus caribou (Gmelin, 1788)) reduce movements to minimize contact with predators and exhibit fidelity to seasonal ranges. We examined fidelity behaviour within season and among years of woodland caribou based on locations of 65 radio-collared individuals in British Columbia, Canada. We used average linear distances between all possible pairs of radiolocations of individuals to assess fidelity. Among-year interlocation distances were similar to within-season interlocation distances during summer, indicating that caribou did not shift their distribution during seasons when they were most vulnerable to predation. Among-year interlocation distances were significantly greater than within-season interlocation distances during both early winter and late winter, indicating that individual caribou shifted their distribution among winters. The amount that an individual's distribution shifted among winters varied among and within individuals over different years. During early winter this behavioural plasticity was correlated with snow accumulation, with individuals having greater interlocation distances in years with high snow accumulation. Our results indicate that site fidelity outside the calving season is unlikely solely influenced by predator avoidance. We suggest that seasonal shifts in the importance of limiting factors vary from predation in summer to food in winter. © 2006 NRC.

scholarly journals Factors influencing variation in site fidelity of woodland caribou (Rangifer tarandus caribou) in southeastern British Columbia

2006 ◽  
Vol 84 (4) ◽  
pp. 537-545 ◽  
Author(s):  
Heiko U. Wittmer ◽  
Bruce N. McLellan ◽  
Frederick W. Hovey
Keyword(s):  
British Columbia ◽  
Site Fidelity ◽  
Rangifer Tarandus ◽  
Snow Accumulation ◽  
Limiting Factors ◽  
Late Winter ◽  
Behavioural Plasticity ◽  
Rangifer Tarandus Caribou ◽  
Early Winter ◽  
Woodland Caribou

Where predation is a major limiting factor, it has been postulated that woodland caribou ( Rangifer tarandus caribou (Gmelin, 1788)) reduce movements to minimize contact with predators and exhibit fidelity to seasonal ranges. We examined fidelity behaviour within season and among years of woodland caribou based on locations of 65 radio-collared individuals in British Columbia, Canada. We used average linear distances between all possible pairs of radiolocations of individuals to assess fidelity. Among-year interlocation distances were similar to within-season interlocation distances during summer, indicating that caribou did not shift their distribution during seasons when they were most vulnerable to predation. Among-year interlocation distances were significantly greater than within-season interlocation distances during both early winter and late winter, indicating that individual caribou shifted their distribution among winters. The amount that an individual’s distribution shifted among winters varied among and within individuals over different years. During early winter this behavioural plasticity was correlated with snow accumulation, with individuals having greater interlocation distances in years with high snow accumulation. Our results indicate that site fidelity outside the calving season is unlikely solely influenced by predator avoidance. We suggest that seasonal shifts in the importance of limiting factors vary from predation in summer to food in winter.

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