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Do baseline glucocorticoids predict fitness?
- F. Bonier, Paul R. Martin, I. Moore, J. Wingfield
- Biology, MedicineTrends in ecology & evolution
- 1 November 2009
Overall, baseline cort can predict the relative fitness of individuals and populations, but the relationship is not always consistent or present.
The relationship between fitness and baseline glucocorticoids in a passerine bird.
- F. Bonier, I. Moore, Paul R. Martin, R. J. Robertson
- Biology, MedicineGeneral and comparative endocrinology
- 1 September 2009
A positive relationship between baseline cort and fitness components during the nestling period suggests that reproductive investment may elicit higher cort levels that feedback to reallocate more effort to reproduction during critical periods of nestling provisioning.
Stress, reproduction, and adrenocortical modulation in amphibians and reptiles
It is suggested that several ecologically based ideas, such as variability in the length of the breeding season and lifetime reproductive opportunities, can be used to explain the utility of adrenocortical modulation in amphibian and reptilian species.
Gonadotropin-inhibitory hormone in Gambel's white-crowned sparrow (Zonotrichia leucophrys gambelii): cDNA identification, transcript localization and functional effects in laboratory and field…
Results indicate that, despite amino acid sequence differences, quail GnIH and sparrow GnIh have similar inhibitory effects on the reproductive axis in wild sparrow species, and GniH appears to be a modulator of gonadotropin release.
Testosterone in Tropical Birds: Effects of Environmental and Social Factors
- W. Goymann, I. Moore, A. Scheuerlein, K. Hirschenhauser, A. Grafen, J. Wingfield
- Biology, MedicineThe 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.
The stress of parenthood? Increased glucocorticoids in birds with experimentally enlarged broods
It is demonstrated that increased reproductive demand can cause increased baseline cort, and the positive relationship between parental behaviour and cort suggests that increased cort does not always interfere with reproductive investment, and might instead facilitate it.
Relationships between Annual Cycles of Testosterone, Corticosterone, and Body Condition in Male Red‐Spotted Garter Snakes, Thamnophis sirtalis concinnus
- I. Moore, J. Lerner, D. Lerner, R. Mason
- Biology, MedicinePhysiological and Biochemical Zoology
- 1 May 2000
It is suggested that annual cycles of testosterone, corticosterone, and body condition can be associated with one another, and considering all three simultaneously is necessary to understand their control and function.
Movements, Mating, and Dispersal of Red-Sided Gartersnakes (Thamnophis sirtalis parietalis) from a Communal Den in Manitoba
Studying the spring emergence of red-sided gartersnakes from a large communal den in Manitoba to clarify the context in which courtship and mating occur found most reproductive activity in this population occurs in small groups, widely dispersed over a broad area.
Interactions of gonadotropin-releasing hormone (GnRH) and gonadotropin-inhibitory hormone (GnIH) in birds and mammals.
- G. Bentley, L. Kriegsfeld, +6 authors J. Wingfield
- Biology, MedicineJournal of experimental zoology. Part A…
- 1 September 2006
The distribution of GnIH in songbirds relative to GnRHs, and the findings on its modes of action in vitro and in vivo, are reviewed, based on laboratory and field studies.
Hormones, sexual signals, and performance of green anole lizards (Anolis carolinensis)
- J. Husak, D. Irschick, J. Meyers, S. Lailvaux, I. Moore
- Biology, MedicineHormones and Behavior
- 1 September 2007
The results suggest that testosterone is important for traits related to dominance in adult male green anole lizards and may influence the ability to compete with rivals via fighting ability or through the use of signals.