Endocrine Correlates of Parental Care in an Antarctic Winter Breeding Seabird, the Emperor Penguin,Aptenodytes forsteri

Lormée, Hervé; Jouventin, Pierre; Chastel, Olivier; Mauget, R.

doi:10.1006/hbeh.1998.1491

Cited by 48 publications

(31 citation statements)

References 37 publications

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“…The plasma concentrations of prolactin were determined by radioimmunoassays at the CEBC (Mauget et al 1995;Lormée et al, 1999Lormée et al, , 2000. Pooled plasma samples produced dose-response curves that paralleled the chicken prolactin standard curves (source, Dr. Parlow, NHPP Harbor-UCLA Medical Center, Los Angeles, CA, Fig.…”

Section: Prolactin and Metabolites Assaysmentioning

confidence: 99%

“…coming back from feeding excursions still present high prolactin levels despite their long absences from the nest (Hector and Goldsmith, 1985). Prolactin remains unaffected by nest failure in emperor (Aptenodytes forsteri) and king penguins (A. patagonicus; Lormée et al, 1999;Jouventin and Mauget, 1996) as well as in females Adélie penguin (Pygoscelis adeliae, Vleck et al, 2000), suggesting that prolactin secretion could be endogenously timed in some pelagic seabirds (Hector and Goldsmith, 1985;Garcia et al, 1996;Lormée et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Factors Affecting Plasma Concentrations of Prolactin in the Common Eider Somateria mollissima

Criscuolo

Chastel

Gabrielsen

et al. 2002

General and Comparative Endocrinology

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Section: Prolactin and Metabolites Assaysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Factors Affecting Plasma Concentrations of Prolactin in the Common Eider Somateria mollissima

Criscuolo

Chastel

Gabrielsen

et al. 2002

General and Comparative Endocrinology

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“…In both king and emperor penguin species, 'parenting hormone' prolactin may be endogenously controlled to maintain parental care during extended absences from the breeding site while foraging (Jouventin and Mauget 1996;Lormée et al 1999). Elevated concentrations of prolactin have been linked to high intraspecific adoption rates in emperor penguins (Angelier et al 2006).…”

Section: Discussionmentioning

confidence: 99%

King penguin brooding and defending a sub-Antarctic skua chick

Oosthuizen

Bruyn

2008

Polar Biol

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Interspecific parental care is rare, conveys no ultimate evolutionary advantage, and is usually attributed to reproductive errors in species with analogous habitat, behaviour and diet. We report on interspecific parental care (brooding and "defence" of unrelated chick) provided by a king penguin to a sub-Antarctic skua chick on Marion Island, despite substantial risk of injury to the penguin due to the presence of the true parents.

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“…Plasmas were stored at -20°C until measured for PRL concentration by radioimmunoassay as described (Lormée et al, 1999). Plasma PRL levels were experimentally decreased by treating the penguin with an intramuscular injection of bromocriptine (Parlodel R long-acting form, Sandoz, Basel, Switzerland; 1.5·mg·kg -1 ·body·mass).…”

Section: Manipulation Of Prolactin Levels and Prolactin Assaymentioning

confidence: 99%

“…Emperor penguins thus constitute a promising model to study the proximate factor triggering kidnapping behaviour. In contrast to most bird species (Chastel and Lormée, 2002), penguins that lose their eggs or their chicks maintain high residual PRL levels throughout the whole breeding season (Garcia et al, 1996;Lormée et al, 1999;Vleck et al, 2000). We hypothesised that kidnapping behaviour is the result of these high levels of PRL.…”

Section: Introductionmentioning

confidence: 99%

Kidnapping of chicks in emperor penguins: a hormonal by-product?

Angelier

Barbraud

Lormée

et al. 2006

Journal of Experimental Biology

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SUMMARY The function and causes of kidnapping juveniles are little understood because individuals sustain some breeding costs to rear an unrelated offspring. Here we focus on the proximal causes of this behaviour in emperor penguins (Aptenodytes forsteri), whose failed breeders often kidnap chicks. We experimentally tested the hypothesis that kidnapping behaviour was the result of high residual levels of prolactin (PRL), a hormone involved in parental behaviour. Penguins with artificially decreased PRL levels by bromocriptine administration kidnapped chicks less often than control penguins. Within the bromocriptine treated group, kidnapping behaviour was not totally suppressed and the probability of kidnapping a chick was positively correlated to PRL levels measured before treatment. During breeding, emperor penguins have to forage in remote ice-free areas. In these birds, PRL secretion is poorly influenced by chick stimuli and has probably evolved to maintain a willingness to return to the colony after a long absence at sea. Therefore, penguins that have lost their chick during a foraging trip still maintain high residual PRL levels and this, combined with colonial breeding,probably facilitates kidnapping. We suggest that kidnapping in non-cooperative systems may result from a hormonal byproduct of a reproductive adaptation to extreme conditions.

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Endocrine Correlates of Parental Care in an Antarctic Winter Breeding Seabird, the Emperor Penguin,Aptenodytes forsteri

Cited by 48 publications

References 37 publications

Factors Affecting Plasma Concentrations of Prolactin in the Common Eider Somateria mollissima

Factors Affecting Plasma Concentrations of Prolactin in the Common Eider Somateria mollissima

King penguin brooding and defending a sub-Antarctic skua chick

Kidnapping of chicks in emperor penguins: a hormonal by-product?

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