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Allostatic load, social status and stress hormones: the costs of social status matter
The ecology of stress: effects of the social environment
The relationship between dominance and glucocorticoid levels varies among species, populations and years, in a manner that depends on the stability of the social hierarchy, environmental conditions, the type of breeding system and the manner in which high rank is obtained and maintained.
On the use of non‐invasive hormone research in uncontrolled, natural environments: the problem with sex, diet, metabolic rate and the individual
- W. Goymann
- 1 August 2012
1. Methods to measure metabolites of steroid hormones from faeces have become very popular in wildlife conservation and ecology, because they allow gathering physiological data without the necessity…
Noninvasive Monitoring of Hormones in Bird Droppings: Physiological Validation, Sampling, Extraction, Sex Differences, and the Influence of Diet on Hormone Metabolite Levels
- W. Goymann
- Biology, Environmental ScienceAnnals of the New York Academy of Sciences
- 1 June 2005
Results suggesting that experimental manipulations of the diet may affect hormone metabolite levels in European stonechats are presented, the first data to report such an impact in birds.
Distinguishing seasonal androgen responses from male–male androgen responsiveness—Revisiting the Challenge Hypothesis
Hormonal mechanisms of cooperative behaviour
- M. Soares, R. Bshary, Rui F. Oliveira
- BiologyPhilosophical Transactions of the Royal Society B…
- 12 September 2010
The aim here is to focus on the potential role of neuroendocrine mechanisms on the regulation of the expression of cooperative behaviour in vertebrates and to evaluate how hormones may influence known cognitive modules that are involved in decision-making processes that may lead to cooperative behaviour.
Noninvasive fecal monitoring of glucocorticoids in spotted hyenas, Crocuta crocuta.
- W. Goymann, E. Möstl, T. V. Van’t Hof, M. East, H. Hofer
- Biology, MedicineGeneral and comparative endocrinology
- 1 June 1999
Fecal steroid assessment is of use in monitoring adrenal activity in spotted hyenas because of the physiological relevance of fecal glucocorticoid metabolites and the high-performance liquid chromatography fractions analyzed by EIA showed various immunoreactive substances with polarities of unconjugated steroids.
Social modulation of androgens in male birds.
- W. Goymann
- BiologyGeneral and comparative endocrinology
- 1 September 2009
Urban-like night illumination reduces melatonin release in European blackbirds (Turdus merula): implications of city life for biological time-keeping of songbirds
- D. Dominoni, W. Goymann, B. Helm, J. Partecke
- Biology, Environmental ScienceFrontiers in Zoology
- 3 October 2013
This study suggests that birds responded to light-at-night as if they were exposed to a longer day than birds kept under dark nights, and points to reduced melatonin release at night as a potential physiological mechanism underlying the advanced onset of morning activity of urbanized birds.
Testosterone in Tropical Birds: Effects of Environmental and Social Factors
- W. Goymann, I. Moore, A. Scheuerlein, K. Hirschenhauser, A. Grafen, J. Wingfield
- Biology, Environmental ScienceThe American Naturalist
- 26 July 2004
Previous notions of low plasma testosterone levels in tropical birds are refined: short breeding seasons and perhaps environmental conditions at high altitudes precipitate conditions under which high testosterone levels are beneficial in the tropics.