Low ambient temperature increases food intake and dropping production, leading to incorrect estimates of hormone metabolite concentrations in European stonechats

Goymann, Wolfgang; Trappschuh, Monika; Jensen, Willi; Schwabl, Ingrid

doi:10.1016/j.yhbeh.2005.12.006

Cited by 78 publications

(62 citation statements)

References 34 publications

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“…Intestinal transit time, which regulates FGCM excretion rate, is influenced by physical activity; rodents excrete GCs more rapidly during the active versus passive phases [123]. Total faecal mass influences FGCM concentration, which may not reflect circulating concentrations [126]. Thus, FGCM measures provide a useful estimate of GC production in free-ranging animals with appropriate methodological considerations and biological validation for each species [125].…”

Section: (D) Limitations Of Current Methodsmentioning

confidence: 99%

Sex, social status and physiological stress in primates: the importance of social and glucocorticoid dynamics

Cavigelli

Caruso

2015

Phil. Trans. R. Soc. B

100

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Social status has been associated with health consequences, although the mechanisms by which status affects health are relatively unknown. At the physiological level, many studies have investigated the potential relationship between social behaviour/rank and physiological stress, with a particular focus on glucocorticoid (GC) production. GCs are of interest because of their experimentally established influence on health-related processes such as metabolism and immune function. Studies in a variety of species, in both naturalistic and laboratory settings, have led to complex outcomes. This paper reviews findings from primates and rodents and proposes a psychologically and physiologically relevant framework in which to study the relationship between social status and GC function. We (i) compare status-specific GC production between male and female primates, (ii) review the functional significance of different temporal patterns of GC production, (iii) propose ways to assess these temporal dynamics, and (iv) present novel hypotheses about the relationship between social status and GC temporal dynamics, and potential fitness and health implications. To understand whether GC production mediates social status-related fitness disparities, we must consider social contest conditions and the temporal dynamics of GC production. This framework will provide greater insights into the relationship between social status, physiological stress and health.

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Section: (D) Limitations Of Current Methodsmentioning

confidence: 99%

Sex, social status and physiological stress in primates: the importance of social and glucocorticoid dynamics

Cavigelli

Caruso

2015

Phil. Trans. R. Soc. B

100

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“…Extraction efficiency was 58G8 per cent (mean Gs.d.). T concentrations were measured by radioimmunoassay following Goymann et al (2006). Because the T antibody has a cross-reactivity of 40 per cent with 5a-dihydrotestosterone our measurement refer to androgens.…”

Section: Methodsmentioning

confidence: 99%

Compensatory investment in zebra finches: females lay larger eggs when paired to sexually unattractive males

2008

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The classical version of the differential allocation hypothesis states that, when females reproduce over their lifetime with partners that differ in their genetic quality, they should invest more in reproduction with highquality males. However, in species with lifetime monogamy, such as the zebra finch, partner quality will typically remain the same. In this case, the compensatory investment (CI ) hypothesis predicts higher investment for low-quality males, because low genetic quality offspring are more dependent on maternal resources. Here, we show that female zebra finches invested more resources, both in terms of egg volume and yolk carotenoid content, when paired to a low genetic quality male, as judged from his previous ability to obtain extra-pair paternity in aviary colonies. We also found that females deposited slightly larger amounts of testosterone into eggs when paired to a low parental quality male, as judging from his previous success in rearing offspring. This is, to our knowledge, the first experimental support for the CI hypothesis in a species with lifetime monogamy. We stress that in more promiscuous species, the benefits of classical differential allocation may partly be neutralized by the supposed benefits of CI.

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“…In addition to whether the male was prospecting, the following fixed effects were fitted: male age (days); whether it was the peak conceptive season ( June-January; Young et al 2007); and sample collection hour. To allow for the possibility that considerable reductions in biomass intake (potentially associated with prospecting) could increase metabolite concentrations per unit faeces by reducing faecal matter throughput (Goymann et al 2006), we also controlled for variation in males' recent net biomass intake. As glucocorticoid metabolites are pooled in the meerkat gut over 24-48 hours ( Young et al 2006), the male's change in body mass between the morning 2 days prior to sampling and the morning after sampling was used as the index of net biomass intake.…”

Section: K1mentioning

confidence: 99%

Stress and the costs of extra-territorial movement in a social carnivore

Young

Monfort

2009

Biol. Lett.

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Costs associated with extra-territorial movement are believed to have favoured the evolution of delayed dispersal and sociality across a range of social vertebrates, but remain surprisingly poorly understood. Here we reveal a novel mechanism that may contribute substantially to the costs of extra-territorial movement: physiological stress. We show that subordinate male meerkats, Suricata suricatta , exhibit markedly elevated faecal glucocorticoid metabolite levels (a non-invasive measure of hypothalamic–pituitary–adrenal axis activity) while conducting extra-territorial prospecting forays. While brief increases in glucocorticoid levels are unlikely to be costly, chronic elevations, arising from prolonged and/or frequent forays, are expected to compromise fitness through their diverse negative effects on health. Our findings strongly suggest that prolonged extra-territorial movements do result in chronic stress, as the high glucocorticoid levels of prospectors do not diminish on longer forays and are no lower among males with greater prospecting experience. A generalized ‘stress’ of extra-territorial movement may therefore have strengthened selection for delayed dispersal and sociality in this and other species, and favoured the conduct of brief forays over extended periods of floating. Our findings have implications too for understanding the rank-related distribution of physiological stress in animal societies, as extra-territorial movements are often conducted solely by subordinates.

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Low ambient temperature increases food intake and dropping production, leading to incorrect estimates of hormone metabolite concentrations in European stonechats

Cited by 78 publications

References 34 publications

Sex, social status and physiological stress in primates: the importance of social and glucocorticoid dynamics

Sex, social status and physiological stress in primates: the importance of social and glucocorticoid dynamics

Compensatory investment in zebra finches: females lay larger eggs when paired to sexually unattractive males

Stress and the costs of extra-territorial movement in a social carnivore

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