Volume of the cloacal protuberance as an indication of reproductive state in male Blue Tits Cyanistes caeruleus.

E. Schut; M.J.L. Magrath; K. Van Oers; J. Komdeur

doi:10.5253/078.100.0212

Volume of the cloacal protuberance as an indication of reproductive state in male Blue Tits Cyanistes caeruleus.

E. Schut, M.J.L. Magrath, K. Van Oers, J. Komdeur

NIOO - Animal Ecology (AnE)

Onderzoeksoutput: Bijdrage aan wetenschappelijk tijdschrift/periodieke uitgave › Artikel › Wetenschappelijk › peer review

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In male passerines, the accumulation of sperm in the sperm reserves causes the cloaca to become enlarged, forming the cloacal protuberance (CP). In Blue Tits, the timing of breeding differs considerably between pairs. Hence, when catching a male during the breeding season it may be unclear whether he is in a reproductively active state (i.e. producing sperm). Here, we show in captive Blue Tits Cyanistes caeruleus that CP volume is increased in males in a reproductively active state when compared to the same males in a reproductively inactive state. However, there was some overlap in CP volume when comparing the values in reproductively active and non-active states. Measurements of CP volume at a single time point, therefore, do not allow the researcher to reliably determine an individual’s reproductive status.

Originele taal-2	Engels
Pagina's (van-tot)	202-205
Tijdschrift	Ardea
Volume	100
Nummer van het tijdschrift	2
DOI's	https://doi.org/10.5253/078.100.0212
Status	Gepubliceerd - 2012

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10.5253/078.100.0212

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abstract = "In male passerines, the accumulation of sperm in the sperm reserves causes the cloaca to become enlarged, forming the cloacal protuberance (CP). In Blue Tits, the timing of breeding differs considerably between pairs. Hence, when catching a male during the breeding season it may be unclear whether he is in a reproductively active state (i.e. producing sperm). Here, we show in captive Blue Tits Cyanistes caeruleus that CP volume is increased in males in a reproductively active state when compared to the same males in a reproductively inactive state. However, there was some overlap in CP volume when comparing the values in reproductively active and non-active states. Measurements of CP volume at a single time point, therefore, do not allow the researcher to reliably determine an individual{\textquoteright}s reproductive status.",

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