An Experimental Study of Incubation Effort in High-Arctic Barnacle Geese

Tombre, Ingunn; Erikstad, Kjell Einar

doi:10.2307/5878

Cited by 67 publications

(52 citation statements)

References 27 publications

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“…However, in a common eider population from Norway, it was found that females laying smaller clutches, presumably birds in poorer condition, had a slightly lower survival than females laying larger clutches (Yoccoz et al 2002). There is also some evidence from related species that poor body condition may have longlasting repercussions-in barnacle geese (Branta leucopsis), female geese with experimentally lowered body condition started the winter migration with smaller reserves than either unmanipulated females or females with experimentally enhanced body condition (Tombre and Erikstad 1996).…”

Section: Testing the Model Predictionsmentioning

confidence: 99%

Parental Effort and Reproductive Skew in Coalitions of Brood Rearing Female Common Eiders

Öst¹,

Clark²,

Kilpi³

et al. 2007

The American Naturalist

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Members of breeding groups face conflicts over parental effort when balancing antipredatory vigilance and feeding. Empirical evidence has shown disparate responses to manipulations of parental effort. We develop a model in which we determine the evolutionarily stable effort of partners given their body conditions, allowing the benefits of shared care to be unevenly divided, and we test this model's predictions with data on common eiders (Somateria mollissima). Eiders show uniparental female care; females may share brood rearing, or they may tend alone, and their body condition at hatching of the young shows large environmentally induced variation. The model predicts that parental effort (vigilance) in a coalition is lower than when tending alone, controlling for parental condition; this prediction is supported by the data. The parental effort in a coalition should be positively correlated with body condition, and this prediction is also supported. Finally, parental effort should increase when partner condition decreases and vice versa; this prediction is partially supported. The Nash bargaining game may provide promising avenues by which to determine the precise settlement of reproductive skew and effort between coalition partners in the future.

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Section: Testing the Model Predictionsmentioning

confidence: 99%

Parental Effort and Reproductive Skew in Coalitions of Brood Rearing Female Common Eiders

Öst¹,

Clark²,

Kilpi³

et al. 2007

The American Naturalist

View full text Add to dashboard Cite

show abstract

“…Waterfowl may respond to their energetic state by adjusting their nest attendance behaviour to avoid starvation or dehydration. For example, long-lived waterfowl may abandon their nests if energy reserves reach levels that threaten immediate or long-term survival, so that future fecundity and survival are rarely sacrificed for immediate reproductive success (Tombre and Erikstad, 1996). These issues may be particularly important among waterfowl species that fast during the breeding season and rely on energy reserves for egg production, incubation, and duckling care (Erikstad et al, 1993).…”

Section: General Theorymentioning

confidence: 99%

“…My research design is similar to Tombre and Erikstad's (1996) experimental study of incubation effort in High Arctic barnacle geese (Branta leucopsis). They examined the cost of reproduction by manipulating the length of the incubation period.…”

Section: Project Origin Design and Implementationmentioning

confidence: 99%

“…For example, a decline in nest attendance occurs among geese with low energy reserves. Low nest attentiveness results in high nest predation and slows egg development (Alrich and Raveling, 1983;Tombre and Erikstad, 1996). Female common eiders nesting in the Arctic are ideal for examining trade-offs between adult survival (mediated by energy reserves) and reproduction.…”

Section: General Theorymentioning

confidence: 99%

“…Body condition was inferred from body mass and controlled for body size (Summers, 1988;Gloutney and Clark, 1991;Tombre and Erikstad, 1996). This method allowed me to compare hens using body condition as an index.…”

Section: Project Origin Design and Implementationmentioning

confidence: 99%

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