Exogenous corticosterone mimics a late fasting stage in captive Adélie penguins (<i>Pygoscelis adeliae</i>)

Spée, Marion; Marchal, Lorène; Thierry, Anne-Mathilde; Chastel, Olivier; Enstipp, Manfred R.; Maho, Yvon Le; Beaulieu, Michaël; Raclot, Thierry

doi:10.1152/ajpregu.00762.2010

Cited by 18 publications

(15 citation statements)

References 34 publications

(70 reference statements)

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“…For instance, an increase of 3.3 times the amount of circulating CORT has already been shown in captive/ fasting male Adélie penguins within 3 d of treatment with these pellets (reaching on average ca. 65 ng ml −1 ; Spée et al 2011b). The CORT values in that study (Spée et al 2011b) were lower than those reached during capture stress (Cockrem et al 2008), and were therefore within the physiological range of this species.…”

Section: Corticosterone Assays and Implant Characteristicssupporting

confidence: 47%

“…65 ng ml −1 ; Spée et al 2011b). The CORT values in that study (Spée et al 2011b) were lower than those reached during capture stress (Cockrem et al 2008), and were therefore within the physiological range of this species. In our study, the CORT levels should have been lower since we were working with freeliving and non-long-term fasting birds.…”

Section: Corticosterone Assays and Implant Characteristicssupporting

confidence: 47%

“…In our study, the CORT levels should have been lower since we were working with freeliving and non-long-term fasting birds. Spée et al (2011b) also indicated the maintenance of this elevated CORT level through 7 to 11 d post-implantation, corresponding therefore to less than the half of our study period.…”

Section: Corticosterone Assays and Implant Characteristicsmentioning

confidence: 77%

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Corticosterone administration leads to a transient alteration of foraging behaviour and complexity in a diving seabird

Cottin¹,

MacIntosh²,

Kato³

et al. 2014

Mar. Ecol. Prog. Ser.

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Hormones link environmental stimuli to the behavioural and/or physiological responses of organisms. The release of corticosterone has major effects on both energy mobilization and its allocation among the various requirements of an individual, especially regarding survival and reproduction. We therefore examined the effects of experimentally elevated baseline corticosterone levels on the foraging behaviour of Adélie penguins Pygoscelis adeliae during chickrearing. We monitored the at-sea behaviour of corticosterone-implanted and control male birds using time-depth recorders, and monitored the effects of corticosterone treatment on their body conditions as well as their chicks' body masses and survival. Bio-logged data were examined via traditional measures of diving behaviour as well as fractal analysis as an index of behavioural complexity. Corticosterone administration caused a transient decrease in both overall foraging effort (i.e. reductions in the duration of at-sea trips, the time spent diving and the number of dives performed) and foraging complexity. In contrast, per-dive performance indices suggested an increase in both efficiency and prey pursuit rates. Ultimately, however, we observed no short-term effects of treatment on adult body condition and chick body mass and survival. We conclude that under higher corticosterone levels, sequences of behaviour may become more structured and periodic, as observed in treated birds. The increased energy allocation to dive-scale behaviours observed in treated birds might then reflect an adjustment to intrinsic constraints allowing reductions in energy expenditure at the trip-scale. This study highlights the utility of using both traditional and fractal analyses to better understand scale-dependent responses of animals to energetic and various other environmental challenges.

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Section: Corticosterone Assays and Implant Characteristicssupporting

confidence: 47%

Section: Corticosterone Assays and Implant Characteristicssupporting

confidence: 47%

Section: Corticosterone Assays and Implant Characteristicsmentioning

confidence: 77%

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Corticosterone administration leads to a transient alteration of foraging behaviour and complexity in a diving seabird

Cottin¹,

MacIntosh²,

Kato³

et al. 2014

Mar. Ecol. Prog. Ser.

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“…These hormones have strong impacts on energy balance and metabolism, especially the maintenance of blood glucose levels [2], [3]. Thus, glucocorticoid concentrations have been correlated with food availability [4], increased feeding behavior [5], human disturbance [6]–[8], and survival [9]–[11]. Consequently, researchers are increasingly attempting to measure stress markers, especially glucocorticoids (e.g.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Handling and Anesthetic Agents on the Stress Response and Carbohydrate Metabolism in Northern Elephant Seals

et al. 2012

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Free-ranging animals often cope with fluctuating environmental conditions such as weather, food availability, predation risk, the requirements of breeding, and the influence of anthropogenic factors. Consequently, researchers are increasingly measuring stress markers, especially glucocorticoids, to understand stress, disturbance, and population health. Studying free-ranging animals, however, comes with numerous difficulties posed by environmental conditions and the particular characteristics of study species. Performing measurements under either physical restraint or chemical sedation may affect the physiological variable under investigation and lead to values that may not reflect the standard functional state of the animal. This study measured the stress response resulting from different handling conditions in northern elephant seals and any ensuing influences on carbohydrate metabolism. Endogenous glucose production (EGP) was measured using [6-3H]glucose and plasma cortisol concentration was measured from blood samples drawn during three-hour measurement intervals. These measurements were conducted in weanlings and yearlings with and without the use of chemical sedatives—under chemical sedation, physical restraint, or unrestrained. We compared these findings with measurements in adult seals sedated in the field. The method of handling had a significant influence on the stress response and carbohydrate metabolism. Physically restrained weanlings and yearlings transported to the lab had increased concentrations of circulating cortisol (F11, 46 = 25.2, p<0.01) and epinephrine (F3, 12 = 5.8, p = 0.01). Physical restraint led to increased EGP (t = 3.1, p = 0.04) and elevated plasma glucose levels (t = 8.2, p<0.01). Animals chemically sedated in the field typically did not exhibit a cortisol stress response. The combination of anesthetic agents (Telazol, ketamine, and diazepam) used in this study appeared to alleviate a cortisol stress response due to handling in the field without altering carbohydrate metabolism. Measures of hormone concentrations and metabolism made under these conditions are more likely to reflect basal values.

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“…reproductive decisions each breeding season based on the integration of available information including their body condition (Vleck & Vleck, 2002). Furthermore, the appetite of birds, especially their re-feeding appetite after incubation and prior to molt, can be largely triggered by hormones (Angelier et al, 2008;Goymann, Lupi, Kaiya, Cardinale, & Fusani, 2017;Spée et al, 2011;Thierry, Ropert-Coudert, & Raclot, 2013) which in this case could explain the qualitatively similar pattern of their mass changes if the nonbreeders were subject to similar hormonal triggers to the breeders. Furthermore, hormones, and particularly corticosterone levels, can influence birds foraging decisions, efficiency, food intake, mass gains and losses, and reproductive success (Angelier et al, 2008;Hennin et al, 2016;Thierry et al, 2013).…”

Section: Statusmentioning

confidence: 99%

Nonbreeder birds at colonies display qualitatively similar seasonal mass change patterns as breeders

Emmerson

Walsh²,

Southwell

2019

Ecology and Evolution

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The difficulty in studying nonbreeding birds means that little is known about them or their resource requirements, despite forming a large and significant component of a population. One way to assess food requirements is to examine changes in body mass, because it indicates the amount of food acquired. In terms of body mass changes, our expectation is that nonbreeders will either (a) be in poorer condition than the breeders which potentially explains why they do not breed or (b) remain at a stable higher mass as they are unconstrained by the physiological costs associated with rearing chicks. Here, we interrogate body mass datasets of breeding and nonbreeding birds of two penguin species to assess these predictions and determine whether differences in mass exist between these two groups throughout the breeding season. The first dataset is from a wild Adélie penguin population, where bird mass was recorded automatically and breeding status determined from a resighting program. A second population of captive gentoo penguins were weighed regularly each breeding season. We demonstrate that although there were times in each year when breeders were heavier than their nonbreeding counterparts for both populations, the mass changes showed qualitatively similar patterns throughout the breeding season irrespective of breeding status. Heavier breeders at times during the breeding season are not unexpected but the overall similar pattern of mass change irrespective of breeding status is in contrast to expectations. It appears that breeding status per se and the constraints that breeding places on birds are not the only driver of changes in mass throughout the breeding season and, although not explicitly studied here, the role of hormones in driving changes in appetite could be key to explain these results. These results present a significant step toward understanding food requirements of nonbreeders in avian populations.

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Exogenous corticosterone mimics a late fasting stage in captive Adélie penguins (Pygoscelis adeliae)

Cited by 18 publications

References 34 publications

Corticosterone administration leads to a transient alteration of foraging behaviour and complexity in a diving seabird

Corticosterone administration leads to a transient alteration of foraging behaviour and complexity in a diving seabird

The Effects of Handling and Anesthetic Agents on the Stress Response and Carbohydrate Metabolism in Northern Elephant Seals

Nonbreeder birds at colonies display qualitatively similar seasonal mass change patterns as breeders

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