Maternal androgens in eggs of communally breeding guira cuckoos (Guira guira)

Cariello, Mariana O.; Macêdo, Regina H.; Schwabl, Hubert

doi:10.1016/j.yhbeh.2005.12.007

Cited by 27 publications

(15 citation statements)

References 34 publications

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“…Finally, higher androgen levels could be a strategy to produce more competitive fledglings. For instance, higher concentrations of yolk A4 have been related to the production of more competitive phenotypes in communally breeding and colonial systems [71], [92]. In the present study, A4 tended to be higher in nests without helpers, even if this was not significant.…”

Section: Discussioncontrasting

confidence: 62%

Maternal Effects in Relation to Helper Presence in the Cooperatively Breeding Sociable Weaver

et al. 2013

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In egg laying species, breeding females may adjust the allocation of nutrients or other substances into eggs in order to maximise offspring or maternal fitness. Cooperatively breeding species offer a particularly interesting context in which to study maternal allocation because helpers create predictably improved conditions during offspring development. Some recent studies on cooperative species showed that females assisted by helpers produced smaller eggs, as the additional food brought by the helpers appeared to compensate for this reduction in egg size. However, it remains unclear how common this effect might be. Also currently unknown is whether females change egg composition when assisted by helpers. This effect is predicted by current maternal allocation theory, but has not been previously investigated. We studied egg mass and contents in sociable weavers (Philetairus socius). We found that egg mass decreased with group size, while fledgling mass did not vary, suggesting that helpers may compensate for the reduced investment in eggs. We found no differences in eggs’ carotenoid contents, but females assisted by helpers produced eggs with lower hormonal content, specifically testosterone, androstenedione (A4) and corticosterone levels. Taken together, these results suggest that the environment created by helpers can influence maternal allocation and potentially offspring phenotypes.

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Section: Discussioncontrasting

confidence: 62%

Maternal Effects in Relation to Helper Presence in the Cooperatively Breeding Sociable Weaver

et al. 2013

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“…Thus, by assessing the hair of neonates, it may be possible to ascertain more specifically if the prenatal hormone exposure of male and female fetuses is differentially affected by the parity of their mothers. Although it has not been systematically examined in mammalian species, there is considerable precedent in reptiles and birds for a differential secretion of sex-specific hormones based on both the order in which the eggs are laid and ambient environmental conditions 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Hormones in infant rhesus monkeys’ (Macaca mulatta) hair at birth provide a window into the fetal environment

et al. 2014

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BackgroundIt is established that maternal parity can affect infant growth and risk for several disorders, but the prenatal endocrine milieu that contributes to these outcomes is still largely unknown. Recently, it has been shown that hormones deposited in hair can provide a retrospective reflection of hormone levels while the hair was growing. Taking advantage of this finding, our study utilized hair at birth to investigate if maternal parity affected fetal hormone exposure during late gestation.MethodsHair was collected from primiparous and multiparous mother and infant monkeys at birth and used to determine steroid hormones embedded in hair while the infant was in utero. An LC/MS/MS technique was refined, which enabled the simultaneous measurement of 8 hormones.ResultsHormone concentrations were dramatically higher in neonatal compared to maternal hair, reflecting extended fetal exposure as the first hair was growing. Further, hair cortisone was higher in primiparous mothers and infants when compared to the multiparous dyads.ConclusionThis research demonstrates that infant hair can be used to track fetal hormone exposure and a panel of steroid hormones can be quantified from hair specimens. Given the utility in nonhuman primates, this approach can be translated to a clinical setting with human infants.

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“…Indeed, numerous studies from many points of view provide us with excellent examples of ongoing coevolution in birds with behavioral (Briskie et al, 1992;Kilner et al, 1999;Madden and Davies, 2006;Soler et al, 1995aSoler et al, , 1995cSoler et al, , 2011, morphological (Brooke and Davies, 1988;Krüger and Davies, 2004;Krüger et al, 2007;Langmore et al, 2011;Lemons and Sedinger, 2011;Spottiswoode, 2010;Welbergen and Davies, 2011), genetic Gibbs et al, 2000;Martín-Gálvez et al, 2006, 200707) and ecological consequences of parasitism (Krüger et al, 2009;Møller et al, 2011;Smith et al, 2002;Ward and Smith, 2000). However, studies about physiological adjustments due to brood parasitism are still scarce and those that exist focus on maternal effects in eggs (Cariello et al, 2006;Hahn et al, 2005;Hargitai et al, 2010;Hauber and Pilz, 2003;Pilz et al, 2005;Schmaltz et al, 2008) or the immune system of the nestlings (Soler et al, 1999a). To the best of our knowledge nothing is known about other physiological indicators like hormones in developing nestlings in response to brood parasitism.…”

Section: Introductionmentioning

confidence: 99%

Corticosterone levels in host and parasite nestlings: Is brood parasitism a hormonal stressor?

Ibáñez‐Álamo

Neve

Roldán

et al. 2012

Hormones and Behavior

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Maternal androgens in eggs of communally breeding guira cuckoos (Guira guira)

Cited by 27 publications

References 34 publications

Maternal Effects in Relation to Helper Presence in the Cooperatively Breeding Sociable Weaver

Maternal Effects in Relation to Helper Presence in the Cooperatively Breeding Sociable Weaver

Hormones in infant rhesus monkeys’ (Macaca mulatta) hair at birth provide a window into the fetal environment

Corticosterone levels in host and parasite nestlings: Is brood parasitism a hormonal stressor?

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