NDLI: Experimentally elevated plasma levels of testosterone do not increase male reproductive success in blue tits

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Experimentally elevated plasma levels of testosterone do not increase male reproductive success in blue tits

Content Provider	Springer Nature Link
Author	Foerster, Katharina Kempenaers, Bart
Copyright Year	2004
Abstract	In temperate passerines, increased testosterone (T) levels during breeding mediate male aggressive and mating behaviour. If individual variability in T levels is reflected in behavioural differences during mating, males with higher T might gain higher reproductive success. This can be tested experimentally by elevating T levels. However, high exogenous T levels are known to have negative effects on male sperm production. This may reduce male fitness, particularly if sperm competition is intense. We experimentally elevated T levels in breeding blue tit males to investigate how T levels above the natural mean influence male reproductive success. Contrary to most—if not all—previous experimental manipulations of T levels in birds, we restricted the treatment with exogenous T to the time when females were fertile and T levels were naturally high in males. In blue tits, extra-pair paternity is an important component of male reproductive success, and its frequency is likely influenced by androgen-mediated behaviours such as mate attraction and aggression towards other males. Here we show that T-males were equally likely to become cuckolded and did not gain more extra-pair paternity than control males. Cuckolded T-males, however, lost more paternity than control males. We discuss the possibility that this is caused by negative effects of T treatment on sperm production.
Starting Page	482
Ending Page	490
Page Count	9
File Format	PDF
ISSN	03405443
Journal	Behavioral Ecology and Sociobiology
Volume Number	56
Issue Number	5
e-ISSN	14320762
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-06-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Parus caeruleus Sexual selection Testosterone Paternity Hormones
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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Experimentally elevated plasma testosterone levels do not influence singing behaviour of male blue tits (Parus caeruleus) during the early breeding season

Effects of testosterone on male-male competition and male-female interactions in blue tits

Age-dependent association between testosterone and crown UV coloration in male blue tits (Parus caeruleus)

Experimentally advancing morning emergence time does not increase extra-pair siring success in blue tit males.

Sex ratio and male sexual characters in a population of blue tits, Parus caeruleus

Manipulation of nest-box density affects extra-pair paternity in a population of blue tits (Parus caeruleus)

Extrapair paternity in the blue tit (Parus caeruleus) : female choice, male charateristics, and offspring quality

Male orang-utan bimaturism and reproductive success at Camp Leakey in Tanjung Puting National Park, Indonesia

Data from: Partner's age, not social environment, predicts extrapair paternity in wild great tits (Parus major) (Dataset)

Experimentally elevated plasma levels of testosterone do not increase male reproductive success in blue tits

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Experimentally elevated plasma testosterone levels do not influence singing behaviour of male blue tits (Parus caeruleus) during the early breeding season

Effects of testosterone on male-male competition and male-female interactions in blue tits

Age-dependent association between testosterone and crown UV coloration in male blue tits (Parus caeruleus)

Experimentally advancing morning emergence time does not increase extra-pair siring success in blue tit males.

Sex ratio and male sexual characters in a population of blue tits, Parus caeruleus

Manipulation of nest-box density affects extra-pair paternity in a population of blue tits (Parus caeruleus)

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Experimentally elevated plasma levels of testosterone do not increase male reproductive success in blue tits