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Full-Text Articles in Life Sciences
Costs Of Reproduction And Carry-Over Effects In Breeding Albatrosses, Glenn T. Crossin, Richard A. Phillips, Christine R. Lattin, L. Michael Romero, Xavier Bordeleau, Christopher M. Harris, Oliver P. Love, Tony D. Williams
Costs Of Reproduction And Carry-Over Effects In Breeding Albatrosses, Glenn T. Crossin, Richard A. Phillips, Christine R. Lattin, L. Michael Romero, Xavier Bordeleau, Christopher M. Harris, Oliver P. Love, Tony D. Williams
Integrative Biology Publications
We investigated the physiology of two closely related albatross species relative to their breeding strategy: black-browed albatrosses (Thalassarche melanophris) breed annually, while grey-headed albatrosses (T. chrysostoma) breed biennially. From observations of breeding fate and blood samples collected at the end of breeding in one season and feather corticosterone levels (fCort) sampled at the beginning of the next breeding season, we found that in both species some post-breeding physiological parameters differed according to breeding outcome (successful, failed, deferred). Correlations between post-breeding physiology and fCort, and links to future breeding decisions, were examined. In black-browed albatrosses, post-breeding physiology and fCort were not …
Energetic Physiology Mediates Individual Optimization Of Breeding Phenology In A Migratory Arctic Seabird, Holly L. Hennin, Jöel Bêty, Pierre Legagneux, H. Grant Gilchrist, Tony D. Williams, Oliver P. Love
Energetic Physiology Mediates Individual Optimization Of Breeding Phenology In A Migratory Arctic Seabird, Holly L. Hennin, Jöel Bêty, Pierre Legagneux, H. Grant Gilchrist, Tony D. Williams, Oliver P. Love
Integrative Biology Publications
The influence of variation in individual state on key reproductive decisions impacting fitness is well appreciated in evolutionary ecology. Rowe et al. (1994) developed a condition-dependent individual optimization model predicting that three key factors impact the ability of migratory female birds to individually optimize breeding phenology tomaximize fitness in seasonal environments: arrival condition, arrival date, and ability to gain in condition on the breeding grounds. While empirical studies have confirmed that greater arrival body mass and earlier arrival dates result in earlier laying, no study has assessed whether individual variation in energetic management of condition gain effects this key fitness-related …
Energetic Physiology Mediates Individual Optimization Of Breeding Phenology In A Migratory Arctic Seabird, Holly L. Hennin, Joël Bêty, Pierre Legagneux, Hugh G. Gilchrist, Tony D. Williams, Oliver P. Love
Energetic Physiology Mediates Individual Optimization Of Breeding Phenology In A Migratory Arctic Seabird, Holly L. Hennin, Joël Bêty, Pierre Legagneux, Hugh G. Gilchrist, Tony D. Williams, Oliver P. Love
Biological Sciences Publications
The influence of variation in individual state on key reproductive decisions impacting fitness is well appreciated in evolutionary ecology. Rowe et al. (1994) developed a condition-dependent individual optimization model predicting that three key factors impact the ability of migratory female birds to individually optimize breeding phenology tomaximize fitness in seasonal environments: arrival condition, arrival date, and ability to gain in condition on the breeding grounds. While empirical studies have confirmed that greater arrival body mass and earlier arrival dates result in earlier laying, no study has assessed whether individual variation in energetic management of condition gain effects this key fitness-related …
Glucocorticoid Manipulations In Free-Living Animals: Considerations Of Dose Delivery, Life-History Context And Reproductive State, Glenn T. Crossin, Oliver P. Love, Steven J. Cooke, Tony D. Williams
Glucocorticoid Manipulations In Free-Living Animals: Considerations Of Dose Delivery, Life-History Context And Reproductive State, Glenn T. Crossin, Oliver P. Love, Steven J. Cooke, Tony D. Williams
Integrative Biology Publications
Experimental glucocorticoid (GC) manipulations can be useful for identifying the mechanisms that drive life-history and fitness variation in free-living animals, but predicting the effects of GC treatment can be complicated. Much of the uncertainty stems from the multi-faceted role of GCs in organismal metabolism, and their variable influence with respect to life-history stage, ecological context, age, sex and individual variation. Glucocorticoid hormones have been implicated in the regulation of parental care in many vertebrate taxa but in two seemingly contradictory ways, which sets up a potential GC-induced 'reproductive conflict'. Circulating GCs mediate adaptive physiological and behavioural responses to stressful events, …