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With a personalyou can read up to articles each month for free. Already have an ? Log in. Log in through your institution. Published sincethe highly respected international scientific journal promotes interest in and conservation of mammals throughout the world by the publication of original and timely research on all aspects of the biology of mammals; e.

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Plasma prolactin during the breeding season in adult and immature macaroni (eudyptes chrysolophus) and gentoo (pygoscelis papua) penguins

Plasma prolactin levels were measured in free-living breeding adult and immature pre-breeding macaroni Eudyptes chrysolophus and gentoo Pygoscelis papua penguins at Bird Island, South Georgia 54 degrees S, 38 degrees W. Macaroni and gentoo penguins first breeding season 7.0 at and 2 years of age, respectively. This pattern is similar to that seen in other altricial species and is consistent with delayed onset of brood patch development and full incubation efficiency, which has been ly reported in penguins. Adult female macaroni penguins showed a marked, but transient, increase in prolactin concentrations within 24 hr of the first egg being laid from 1.

Elevated plasma prolactin levels occurred in all age classes of immature nonbreeding birds in both macaroni 1- to 5 year-olds and gentoo 1-year-olds penguins. However, compared to that in adult birds, the increase in prolactin was more transient in immatures, a smaller proportion of immatures had detectable prolactin levels at each stage of the breeding cycle, and, at least in 1- and 2-year-olds, absolute levels of prolactin were lower. Please enable it to take advantage of the complete set of features!

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Plasma prolactin during the breeding season in adult and immature macaroni (eudyptes chrysolophus) and gentoo (pygoscelis papua) penguins

Full text links Cite Display options Display options. Abstract Plasma prolactin levels were measured in free-living breeding adult and immature pre-breeding macaroni Eudyptes chrysolophus and gentoo Pygoscelis papua penguins at Bird Island, South Georgia 54 degrees S, 38 degrees W. Similar articles Reproductive endocrinology of macaroni Eudyptes chrysolophus and gentoo Pygoscelis papua penguins. Plasma levels of gonadal steroids and LH in immature birds in relation to deferred sexual maturity.

Williams TD. Gen Comp Endocrinol.

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PMID: Reproductive endocrinology of macaroni Eudyptes chrysolophus and gentoo Pygoscelis papua penguins. Seasonal changes in plasma levels of gonadal steroids and LH in breeding adults.

Breeding decisions and output are correlated with both temperature and rainfall in an arid-region passerine, the sociable weaver

Endocrine basis of the reproductive pattern of the Gentoo penguin Pygoscelis papua : winter breeding and extended laying period in northern populations. Mauget R, et al. Orchestration of avian reproductive effort: an integration of the ultimate and proximate bases for flexibility in clutch size, incubation behaviour, and yolk androgen deposition. Sockman KW, et al. Biol Rev Camb Philos Soc. Epub Oct PMID: Review. Predators and the breeding bird: behavioral and reproductive flexibility under the risk of predation. Lima SL. See all similar articles. Cited by 1 article Linking physiological approaches to marine vertebrate conservation: using sex steroid hormone determinations in demographic assessments.

Conserv Physiol.

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MeSH terms Animals Actions. Female Actions. Male Actions. Seasons Actions.

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Species Specificity Actions. Substances Prolactin Actions. Full text links [x] Elsevier Science. Copy Download.