The timing of embryonic exposure to elevated temperature alters stress endocrinology in domestic chickens (Gallus domesticus)

Wilsterman, Kathryn; Mast, Andrew D.; Luu, Thuyvan H.; Haussmann, Mark F.

doi:10.1016/j.ygcen.2015.01.009

Cited by 15 publications

(10 citation statements)

References 43 publications

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“…Interestingly, heat exposure also altered stress-induced CORT later in life in domestic chicken (e.g. Wilsterman et al, 2015). Thermal manipulation affected the proportion of thermosensitive neurons, which can then influence the downstream neuronal and hormonal responses involved in thermoregulation (Loh et al, 2004;Tzschentke and Basta, 2002).…”

Section: Epigenetic Adaptationmentioning

confidence: 99%

Endocrinology of thermoregulation in birds in a changing climate

Ruuskanen¹,

Hsu²,

Nord³

2019

Preprint

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The ability to maintain a (relatively) stable body temperature in a wide range of thermal environments is a unique feature of endotherms such as birds. Endothermy is acquired and regulated via various endocrine and molecular pathways, and ultimately allows wide aerial, aquatic, and terrestrial distribution in variable environments. However, due to our changing climate, birds are faced with potential new challenges for thermoregulation, such as more frequent extreme weather events, lower predictability of climate, and increasing mean temperature. We provide a compact overview on thermoregulation in birds and its endocrine and molecular mechanisms, pinpointing gaps in current knowledge and recent developments, focusing especially on non-model species to understand the generality of, and variation in, mechanisms. We highlight plasticity in thermoregulation and underlying endocrine regulation, because thorough understanding of plasticity is key to predicting responses to changing environmental conditions. To this end, we discuss how changing climate is likely to affect avian thermoregulation and associated endocrine traits, and how the interplay between these physiological processes may play a role in facilitating or constraining adaptation to a changing climate. We conclude that while the general patterns of endocrine regulation of thermogenesis are quite well understood, at least in poultry, the molecular and endocrine mechanisms that regulate e.g. mitochondria function and plasticity of thermoregulation over different time scales (from transgenerational to daily variation) need to be unveiled. Plasticity may ameliorate climate change effects on thermoregulation to some extent, but the increased frequency of extreme weather events, and associated in resource availability, may be beyond the scope and/or speed for plastic responses. This could lead to selection for more tolerant phenotypes, if the underlying physiological traits harbour genetic and individual variation for selection to act on – a key question for future research.

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Section: Epigenetic Adaptationmentioning

confidence: 99%

Endocrinology of thermoregulation in birds in a changing climate

Ruuskanen¹,

Hsu²,

Nord³

2019

Preprint

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“…Although developmental stress is a broad term, it generally refers to any sub-optimal condition experienced during either the prenatal or postnatal developmental period, including: food restriction, elevated glucocorticoid stress hormones, extreme ambient temperature, varied incubation temperature, immune challenges, psychological disturbances such as altered paternal care and social contact, and anthropogenic disturbances (e.g., Banerjee et al 2012;Buchanan et al 2003;Crino et al 2011;Fairhurst et al 2012;Grindstaff et al 2012;Honarmand et al 2010;Lynn and Kern 2014;Pravosudov and Kitaysky 2006;Spencer et al 2009;Walker et al 2005aWalker et al , 2005bWeaver et al 2004;Wilsterman 2015). The effects of developmental stress have been widely studied across taxonomic groups.…”

Section: Introductionmentioning

confidence: 99%

Developmental stress: evidence for positive phenotypic and fitness effects in birds

Crino

Breuner

2015

J Ornithol

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“…Circulating baseline levels of glucocorticoids are detectable during embryonic development19, indicating a pre-hatch maturation of the adrenal glands. Furthermore, partial or constant modification of incubation temperature modifies the pattern of HPA-axis reactivity post hatch20. Injection of ACTH on day one post hatch significantly elevated the levels of circulating CORT2122, whereas bone fracturing failed to evoke adrenal steroid responses21.…”

mentioning

confidence: 99%

Domestication and ontogeny effects on the stress response in young chickens (Gallus gallus)

Ericsson

Jensen

2016

Sci Rep

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Domestication is thought to increase stress tolerance. The connection between stressor exposure, glucocorticoids and behavioural responses has been studied in adults, where domestication effects are evident. Early stress exposure may induce detrimental effects both in short-and long term. Previous research has reported a lack of glucocorticoid response in newly hatched chickens (Gallus gallus), whereas others have found opposite results. Hence it remains unclear whether the HPA-axis is functional from hatch, and if domestication has affected the early post-hatch ontogeny of the stress response. Our aims were to investigate the early ontogeny of the HPA-axis and characterize behavioural and hormonal stress responses in ancestral Red Junglefowl and in two domestic layer strains. Plasma corticosteone and behavioural responses before and after physical restraint was measured on day one, nine, 16 and 23 post hatch. The results showed significant increases of corticosterone after stress in all three breeds at all the different ages. The HPA-response decreased with age and was lower in Red Junglefowl. Behavioural responses also decreased with age, and tended to be stronger in Red Junglefowl. In summary, the HPA-axis is reactive from day one, and domestication may have affected its development and reactivity, alongside with related behaviour responses.

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The timing of embryonic exposure to elevated temperature alters stress endocrinology in domestic chickens (Gallus domesticus)

Cited by 15 publications

References 43 publications

Endocrinology of thermoregulation in birds in a changing climate

Endocrinology of thermoregulation in birds in a changing climate

Developmental stress: evidence for positive phenotypic and fitness effects in birds

Domestication and ontogeny effects on the stress response in young chickens (Gallus gallus)

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