Sources of diel variation in energetic physiology in an Arctic-breeding, diving seaduck

Steenweg, Rolanda J.; Hennin, Holly L.; Bêty, Joël; Gilchrist, H. Grant; Williams, Tony; Crossin, Glenn T.; Love, Oliver P.

doi:10.1016/j.ygcen.2015.04.012

Cited by 11 publications

(9 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Across all years, blood samples were collected at all times of day. Although baseline CORT and TRIG have been shown to exhibit diel variation in secretion in temperate-breeding species (e.g., Dallman et al 1993;Jenni and Jenni-Eiermann 1996), Arctic common eiders at our study site do not exhibit these diel trends during the breeding season (Steenweg et al 2015), allowing us to include all collected blood samples in analyses. Blood samples were transferred to a heparinized collecting tube and centrifuged for 10 min at 10,000 rpm, and the separated plasma and red blood cells were stored at 2207C in the field (2807C in the lab) until further analysis.…”

Section: Study Site and General Field Methodsmentioning

confidence: 99%

Energetic Physiology Mediates Individual Optimization of Breeding Phenology in a Migratory Arctic Seabird

Hennin

Bêty

Legagneux

et al. 2016

The American Naturalist

Self Cite

View full text Add to dashboard Cite

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 to maximize 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 decision. Using an 8-year data set from over 350 prebreeding female Arctic common eiders (Somateria mollissima), we tested this component of the model by examining whether individual variation in two physiological traits influencing energetic management (plasma triglycerides: physiological fattening rate; baseline corticosterone: energetic demand) predicted individual variation in breeding phenology after controlling for arrival date and body mass. As predicted by the optimization model, individuals with higher fattening rates and lower energetic demand had the earliest breeding phenology (shortest delays between arrival and laying; earliest laying dates). Our results are the first to empirically determine that individual flexibility in prebreeding energetic management influences key fitness-related reproductive decisions, suggesting that individuals have the capacity to optimally manage reproductive investment.

show abstract

Section: Study Site and General Field Methodsmentioning

confidence: 99%

Energetic Physiology Mediates Individual Optimization of Breeding Phenology in a Migratory Arctic Seabird

Hennin

Bêty

Legagneux

et al. 2016

The American Naturalist

Self Cite

View full text Add to dashboard Cite

show abstract

“…1d,f; Fig. 2; Table 2; e.g., Breuner et al, 1999;Jessop et al, 2002;Landys et al, 2006;Quillfeldt et al, 2007;Steenweg et al, 2015;Woodley et al, 2003). However, the corticosterone results matched those from some, but not all, species studied under continuous polar light.…”

Section: Corticosteronementioning

confidence: 68%

“…However, the corticosterone results matched those from some, but not all, species studied under continuous polar light. Adélie penguins (Pygoscelis adeliae) and common eiders (Somateria mollissima) during summer near the polar circle had no diel variation in circulating corticosterone (Steenweg et al, 2015;Vleck and van Hook, 2002). In the eiders, the lack of diel variation in corticosterone was attributed to continuous activity across the diel cycle in the population studied (Steenweg et al, 2015).…”

Section: Corticosteronementioning

confidence: 88%

Melatonin and corticosterone profiles under polar day in a seabird with sexually opposite activity-rhythms

Huffeldt

Merkel

Jenni-Eiermann

et al. 2020

General and Comparative Endocrinology

View full text Add to dashboard Cite

The 24 h geophysical light-dark cycle is the main organizer of daily rhythms, scheduling physiology and behavior. This cycle attenuates greatly during the continuous light of summer at polar latitudes, resulting in species-specific and even individual-specific patterns of behavioral rhythmicity, but the physiological mechanisms underlying this variation are poorly understood. To address this knowledge gap and to better understand the roles of the hormones melatonin and corticosterone in rhythmic behavior during polar day, we exploited the behavior of thick-billed murres (Uria lomvia), a charadriiform seabird with sexually opposite ('antiphase') activityrhythms on a 24 h cycle during the continuous light of polar summer. Melatonin concentration in the plasma of inactive males was unexpectedly high around midday and subsequently fell during a sudden decrease in light intensity as the colony became shaded. Corticosterone concentration in plasma did not vary with time of day or activity in either sex. While the reasons for these unusual patterns remain unclear, we propose that a flexible melatonin response and little diel variation of corticosterone may be adaptive in thick-billed murres, and perhaps other polar birds and mammals, by stabilizing glucocorticoids' role of modulating energy storage and mobilization across the diel cycle and facilitating the appropriate reaction to unexpected stimuli experienced across the diel cycle while attending the colony.

show abstract

“…g . [ 12 , 13 , 31 ]) even under 24 hours of continuous natural daylight, whereas in other species the daily rhythm components of plasma corticosterone concentrations were absent (Adélie penguin, [ 9 ], common eider ( Somateria mollissima ), [ 32 ]). In the latter study, the absence of a clear diel corticosterone pattern in common eiders was linked to the influence of corticosterone on constant foraging activity [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Diel pattern of corticosterone metabolites in Arctic barnacle goslings (Branta leucopsis) under continuous natural light

et al. 2017

View full text Add to dashboard Cite

Here we describe the excretion pattern of corticosterone metabolites collected from droppings in barnacle goslings (Branta leucopsis) raised under 24 hours of continuous natural light in the Arctic. In lower latitudes, circulating corticosterone peaks around waking and shows a nadir between midnight and 4:00, whereas the peak and nadir are time-delayed slightly when measuring corticosterone metabolites from droppings. Photoperiod, along with other environmental factors, helps to entrain an animal’s endogenous rhythm to that of the natural world. North of the Arctic Circle, photoperiod may not be a reliable cue as light is continuously absent during the winter and continuously present during the summer. Here, for the first time, we used droppings to describe a 24-hour excretion pattern of corticosterone metabolites (CORTm). By applying circular statistics for dependent data, we found a diel rhythmic pattern even under continuous natural light. We discuss potential alternative ‘Zeitgeber’ that may function even in the polar regions, focusing on melatonin. We propose a line of research to measure melatonin non-invasively from droppings. We also provide a validation of the adopted enzyme immunoassay (EIA) that was originally developed for greylag geese.

show abstract

Sources of diel variation in energetic physiology in an Arctic-breeding, diving seaduck

Cited by 11 publications

References 39 publications

Energetic Physiology Mediates Individual Optimization of Breeding Phenology in a Migratory Arctic Seabird

Energetic Physiology Mediates Individual Optimization of Breeding Phenology in a Migratory Arctic Seabird

Melatonin and corticosterone profiles under polar day in a seabird with sexually opposite activity-rhythms

Diel pattern of corticosterone metabolites in Arctic barnacle goslings (Branta leucopsis) under continuous natural light

Contact Info

Product

Resources

About