Stress-induced changes in body surface temperature are repeatable, but do not differ between urban and rural birds

Tabh, Joshua K. R.; Mastromonaco, Gabriela F.; Burness, Gary

doi:10.1007/s00442-022-05120-z

Cited by 2 publications

(4 citation statements)

References 73 publications

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“…Evaluating stress levels and responses of free-living animals in a non-invasive manner using thermal imaging is a burgeoning field of research (Jerem et al, 2015;Tabh et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…Evaluating stress levels and responses of free-living animals in a non-invasive manner using thermal imaging is a burgeoning field of research (Jerem et al, 2015; Tabh et al, 2022). However, little is still known about the underlying pathways of stress physiology that influence the changes in surface temperature.…”

Section: Discussionmentioning

confidence: 99%

“…These adaptations allow birds to conserve heat when foraging in cold Antarctic waters (Handrich et al, 1997), and to rapidly recover to normothermia when exiting the water . Thermal imaging has been frequently used in the last years to investigate acute (see an overview in Table 1) and chronic (Herborn et al, 2018;Robertson et al, 2020aRobertson et al, , 2020bTabh et al, 2022;Winder et al, 2020) stress-response in birds. Because of their dense and watertight plumage, the use of thermal imaging in penguins is restricted to measuring bare parts of the body, such as the eye (periorbital region) and beak .…”

Section: Introductionmentioning

confidence: 99%

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Surface temperatures are influenced by handling stress independently of corticosterone levels in wild king penguins(Aptenodytes patagonicus)

Lewden,

Ward,

Noiret

et al. 2023

Preprint

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Assessing the physiological stress responses of wild animals opens a window for understanding how organisms cope with environmental challenges. Since stress response is associated with changes in body temperature, the use of body surface temperature through thermal imaging could help to measure acute and chronic stress responses non-invasively. We used thermal imaging, acute handling-stress protocol and an experimental manipulation of glucocorticoid hormone levels in breeding king penguins (Aptenodytes patagonicus), to assess: 1. the potential contribution of the Hypothalamo-Pituitary-Adrenal (HPA) axis in mediating chronic and acute stress-induced changes in adult surface temperature, 2. the influence of HPA axis manipulation on parental investment through thermal imaging of eggs and brooded chicks, and 3. the impact of parental treatment on offspring thermal response to acute handling. Eye temperature (Teye) increased and beak temperature (Tbeak) decreased in response to handling stress in adults, but neither basal nor stress-induced surface temperatures were significantly affected by glucocorticoid implants. While egg temperature was not significantly influenced by parental treatment, we found a surprising pattern for chicks: chicks brooded by the (non-implanted) partner of glucocorticoid-implanted individuals exhibited higher surface temperature (both Teye and Tbeak) than those brooded by glucocorticoid-implanted or control parents. Chick response to handling in terms of surface temperature was characterized by a drop in both Teye and Tbeak independently of parental treatment. We conclude that the HPA seems unlikely to play a major role in determining chronic or acute changes in surface temperature in king penguins. Changes in surface temperature may primarily be mediated by the Sympathetic-Adrenal-Medullary axis (SAM) in response to stressful situations. Our experiment did not reveal a direct impact of parental HPA manipulation on parental investment (egg or chick temperature), but a potential influence on the partner brooding behaviour (i.e. family-transmitted stress hypothesis).

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“…Evaluating stress levels and responses of free-living animals in a non-invasive manner using thermal imaging is a burgeoning field of research (Jerem et al, 2015;Tabh et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface temperatures are influenced by handling stress independently of corticosterone levels in wild king penguins(Aptenodytes patagonicus)

Lewden,

Ward,

Noiret

et al. 2023

Preprint

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“…conditional on ambient temperature; 64) and were only calculated for responses to cold since we were unable to estimate within-individual variation explained by ambient temperature in the heat (owing to manual calculation). To statistically test our repeatability values against null expectations (which can be greater than 0), we again followed methods described by others (65). Briefly, models predicting relative metabolism in response to temperature we re-run but while randomly scrambling individual identities among measurements.…”

Section: Methodsmentioning

confidence: 99%

No evidence that shrinking and shapeshifting meaningfully affect how birds respond to warming and cooling

Tabh,

Persson,

Correia

et al. 2024

Preprint

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Across the globe, birds and mammals are becoming smaller and longer-limbed. Although the cause of these changes is unclear, many argue that each provide thermoregulatory benefits in a warmer world by easing heat dissipation. Here, we show that neither body size nor limb length in a model species (the Japanese quail) influenced metabolic costs of warming during a cold challenge. In the heat, larger body sizes increased metabolic costs of thermoregulation, however, this effect was moderate and almost always negated by cooling from the limbs (>97% of cases). Rearing in the warmth (30°C) relative to the cold (10°C) reduced body sizes and increased limb lengths at adulthood but thermoregulatory benefits of these changes in later heat exposures were absent. Our findings demonstrate that shrinking and shape-shifting are unlikely to ease thermoregulation in contemporary birds or reflect selection for such. Alternative contributors, including neutral or non-adaptive plasticity, should be further investigated.

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Stress-induced changes in body surface temperature are repeatable, but do not differ between urban and rural birds

Cited by 2 publications

References 73 publications

Surface temperatures are influenced by handling stress independently of corticosterone levels in wild king penguins(Aptenodytes patagonicus)

Surface temperatures are influenced by handling stress independently of corticosterone levels in wild king penguins(Aptenodytes patagonicus)

No evidence that shrinking and shapeshifting meaningfully affect how birds respond to warming and cooling

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