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  The role of prolactin in the regulation of clutch size and onset of incubation behavior in the American kestrel

Sockman, K. W., Schwabl, H., & Sharp, P. J. (2000). The role of prolactin in the regulation of clutch size and onset of incubation behavior in the American kestrel. Hormones and Behavior, 38(3), 168-176. doi:10.1006/hbeh.2000.1616.

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 Urheber:
Sockman, K. W., Autor
Schwabl, Hubert1, Autor           
Sharp, P. J., Autor
Affiliations:
1Washington State University Pullman, USA, ou_persistent22              

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 Zusammenfassung: In most bird species, the timing of incubation onset may influence the degree of hatching asynchrony, which, together with variation in clutch size, affects reproductive success. In some domesticated species that usually show no hatching asynchrony, plasma prolactin concentrations in females rise with the onset of incubation and the end of laying, and this rise enhances incubation behavior and may terminate laying. To investigate whether a rise in prolactin during laying is involved in the regulation of clutch size and incubation onset in a species with hatching asynchrony, we measured plasma concentrations of immunoreactive prolactin (ir-prolactin) in laying American kestrels, Falco sparverius, and quantified clutch size and incubation behavior. In a separate study, we administered one of three concentrations of ovine prolactin (o-prolactin) via osmotic pumps implanted in females when egg 2 of a clutch was laid. ir-Prolactin concentrations during laying were higher in small than in large clutches and increased in parallel with the development of incubation behavior. o-Prolactin treatment enhanced incubation behavior, but did not affect clutch size, possibly because the manipulation was performed after clutch size had already been determined. Consistent with studies on domesticated species that show synchronous hatching, our results indicate that rising prolactin during laying enhances the expression of incubation behavior in a species that shows hatching asynchrony. Further studies are necessary to determine whether the relationship between prolactin and clutch size in the American kestrel is one of causation or of mere association. (C) 2000 Academic Press.

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 Datum: 2000-11-01
 Publikationsstatus: Erschienen
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 Identifikatoren: Anderer: WOS:000165420600003
DOI: 10.1006/hbeh.2000.1616
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Titel: Hormones and Behavior
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Amsterdam : Academic Press
Seiten: - Band / Heft: 38 (3) Artikelnummer: - Start- / Endseite: 168 - 176 Identifikator: ISSN: 0018-506X
CoNE: https://pure.mpg.de/cone/journals/resource/954922645022