Diel rhythms of basal and stress‐induced corticosterone in a wild, seasonal vertebrate, Gambel's white‐crowned sparrow

Breuner, Creagh W.; Wingfield, John C.; Romero, L. Michael

doi:10.1002/(sici)1097-010x(19990801)284:3<334::aid-jez11>3.0.co;2-#

Cited by 231 publications

(130 citation statements)

References 30 publications

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“…I know of no other study that has examined the effects of time of day on immune function in wild animals. However, these results are in keeping with studies that have shown that glucocorticoids vary with time of day in a variety of species, including passerine birds (Breuner et al, 1999;Dhabhar and McEwen, 1997;Dickstein et al, 1991;Janssens et al, 1995;Rich and Romero, 2001). In the case of diel rhythms in glucocorticoids, it has been suggested that fluctuations in hormone levels may be beneficial for individuals in the wild by adjusting their responses to stressors in ways that are most appropriate at different times during the day (Breuner et al, 1999), possibly reflecting differences in activity level or metabolic demands.…”

Section: Fig 2 Variation In Immune Function With Handling Timesupporting

confidence: 90%

“…Several studies have shown that glucocorticoid levels vary with time of day in a variety of species (Breuner et al, 1999;Dhabhar and McEwen, 1997;Dickstein et al, 1991;Janssens et al, 1995;Rich and Romero, 2001). Given the ample literature linking glucocorticoid levels to immune function (reviewed in Martin, 2009), it is possible that immune function could also vary with time of day.…”

Section: Introductionmentioning

confidence: 99%

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Common measures of immune function vary with time of day and sampling protocol in five passerine species

Zylberberg

2015

Journal of Experimental Biology

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Ecological immunology is a rapidly growing field of study that focuses on understanding variation in immune systems across species and how this relates to species ecology and evolution. Newly developed field methods aimed at studying variation in immune function in a field setting have yielded many insights. Nonetheless, there continues to be much debate regarding the interpretation of field measures of immune function. There is substantial evidence to suggest that handling stress could introduce variation into measures of immune function, yet no study has examined the impacts of incremental changes in handling times under 30 min on immune measures. Nor has any study examined variation in immune function with time of day, though other physiological measures, including glucocorticoids known to impact immune function, vary with time of day. Here, I used observational field data to test the hypothesis that innate immune function varies with handling stress. Furthermore, I tested the hypothesis that innate immune function changes over the course of the day. I show that measures of innate immune function vary with (1) handling stress over short time periods typical of sample collection in the field, and (2) the time of day that an individual is sampled. I discuss these findings from an ecological perspective and suggest that the observed variation is not random, but is likely to have important adaptive functions. I end with a summary of the practical implications of these findings for field studies of ecological immunology.

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Section: Fig 2 Variation In Immune Function With Handling Timesupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Common measures of immune function vary with time of day and sampling protocol in five passerine species

Zylberberg

2015

Journal of Experimental Biology

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“…Consequently, high corticosterone levels in the egg yolk would modify the development, phenotype and behaviour of offspring. Chicks hatched from eggs with high corticosterone content will grow slower than control chicks and will have a higher magnitude of hypothalamopituitary-adrenal responses (Hood et al, 1998;Bruener et al, 1999;Berg, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…These impacts elevate the plasma corticosterone levels also in laying birds via the influence of environmental circumstances, animal husbandry technologies and other anthropogenic disturbances, occurrence of infections, parasitic infestations and other diseases, feed and water shortages, feed-composition deficiencies, poor body structure, high predator or fellow animal densities, habitat quality and other stress factors acting as physiological and animal welfare determinants (Bruener et al, 1999;Bruener and Hahn, 2003).…”

mentioning

confidence: 99%

Influence of the type of management system on corticosterone transfer into eggs in laying hens

Sas¹,

Domány²,

Gyimóthy

et al. 2006

Acta Veterinaria Hungarica

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The effect of free-range versus cage management system on corticosterone transfer into the eggs was studied in laying hens. Hungarian Yellow laying hens (age: 21 weeks, body weight: 2.0 ± 0.5 kg) were divided into two groups in the spring: Group I, free-range keeping (n = 15 layers, density: > 0.5 bird/m 2 ) in outdoor runs, with continuous access to a commercial layer feed; Group II, hens kept in battery cages (n = 17 layers, density: 2 birds/m 2 , natural light, continuous access to feed and water). Eggs were collected after a one-week adaptation period on days 2, 7 and 16. Corticosterone (CST) was extracted from homogenised egg samples using an ASE-200 Accelerated Solvent Extractor and then assayed by liquid chromatography linked with tandem mass spectrometry (LC-MS/MS) [Thermo Quest Surveyor high-performance liquid chromatography (HPLC) interfaced via Atmospheric Pressure Chemical Ionisation (APCI) ion source to Finnigan/Thermo Quest LCQ Deca MS/MS] using dexamethasone as internal standard with positive APCI ionisation. CST concentrations of whole eggs laid by free-range hens on days 2, 7 and 16 were 0.370 ± 0.218, 0.259 ± 0.066 and 0.915 ± 0.745 ng·g -1 , respectively, while those of eggs laid by caged hens were 0.206 ± 0.157, 0.223 ± 0.165 and 0.184 ± 0.110 ng·g -1 at the above sampling times. It is concluded that in free-range laying hens the sharp changes of environmental weather conditions significantly increased the corticosterone content of eggs, while the environmentally controlled and closed battery cage management technology resulted in relatively uniform corticosterone concentrations in the whole eggs.

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“…Latitudinal variation in CORT levels (and its eVects on immune activity) may be related to diVerent environmental conditions (Breuner et al, 2003;Pereyra and WingWeld, 2003;Pravosudov et al, 2002). DiVerent photoperiods may also be important, as light levels can aVect both CORT (Rich and Romero, 2001; but see Breuner et al, 1999;Romero and Remage-Healey, 2000) and immune function (Bilbo et al, 2002;Greenman et al, 2005). Further, experiences during ontogeny may also matter.…”

Section: Why Do Cort and Its Evect On Immune Function Vary With Latitmentioning

confidence: 99%

Corticosterone suppresses cutaneous immune function in temperate but not tropical House Sparrows, Passer domesticus

Martin

Gilliam

Han

et al. 2005

General and Comparative Endocrinology

152

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Diel rhythms of basal and stress‐induced corticosterone in a wild, seasonal vertebrate, Gambel's white‐crowned sparrow

Cited by 231 publications

References 30 publications

Common measures of immune function vary with time of day and sampling protocol in five passerine species

Common measures of immune function vary with time of day and sampling protocol in five passerine species

Influence of the type of management system on corticosterone transfer into eggs in laying hens

Corticosterone suppresses cutaneous immune function in temperate but not tropical House Sparrows, Passer domesticus

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