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How does corticosterone affect parental behaviour and reproductive success? A study of prolactin in black-legged kittiwakes
It is shown that even a relatively short-term increase in corticosterone levels can durably affect plasma prolactin levels, which highlights the need to consider the potential synergistic effects of these two hormones when studying on the hormonal basis of parental decisions.
Flexibility in the bimodal foraging strategy of a high Arctic alcid, the little auk Alle alle
It is found that the foraging pattern of the little auk was flexible and could be adjusted at three levels: the length of long-trips, the frequency of short-Trips, and the total time spent foraging, which resulted in reduced provisioning rates of chicks despite the fact that birds also increased the time allocated to foraging.
Daily energy expenditure increases in response to low nutritional stress in an Arctic‐breeding seabird with no effect on mortality
Elevated DEE was presumably caused by increased parental effort as reflected by higher chick provisioning rates and larger chick meals, and was associated with fitness benefits in terms of enhanced current reproductive success, suggesting ecological consequences associated with limited resource availability may outweigh possible direct negative physiological effects of elevated DEE.
Flexibility in the parental effort of an Arctic-breeding seabird
There may be a threshold to the additional reproductive costs breeders will accept, with parents prioritizing self-maintenance over increased provisioning effort when foraging costs become too high, as predicted by life-history theory.
Thyroid hormones correlate with resting metabolic rate, not daily energy expenditure, in two charadriiform seabirds
T3 provides a good proxy for resting metabolism but not DEE in these seabird species, and the relationships between free and bound levels of the thyroid hormones thyroxine and triiodothyronine with DEE are examined.
Climate change and phenological responses of two seabird species breeding in the high-Arctic
This study identifies some spring environ- mental factors important for regulating the timing of breeding in the high-Arctic, most likely through effects on snow cover limiting access to nest sites and the development of the polar marine food web.
Multicolony tracking reveals potential threats to little auks wintering in the North Atlantic from marine pollution and shrinking sea ice cover
Extensive development of human activities in combination with ocean warming is rapidly modifying marine habitats in the Arctic and North Atlantic regions. To understand the potential impacts on
Evidence for an intrinsic energetic ceiling in free-ranging kittiwakes Rissa tridactyla.
There was no evidence of a negative effect of DEE on adult return rate, which does not support the hypothesis of a survival cost connected to elevated energy expenditure, and the additional lack of variation in DEE with respect to ambient temperature, brood size or between sexes suggests that kittiwakes at a time of peak energy demands may operate close to an intrinsic metabolic ceiling independent of extrinsic factors.