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Extra-pair paternity in Varied Tits Poecile varius

100%

Ju J., Yin J., Racey P., Zhang L., Li D., Wan D.

Acta Ornithologica

2014

tom 49

nr 1

Extra-pair paternity is of particular interest in socially monogamous species, in which there is a substantial discrepancy between social and genetic mating systems. Varied Tits Poecile varius are socially monogamous passerine birds with a distribution in Japan, Korea, and northeast China. We established paternity in all individuals of 40 broods by microsatellite genotyping. Extra-pair paternity occurred in 16 of the 40 broods (40%) and accounted for about 14.7% (37/251) of offspring, higher than the average value (11%) among socially monogamous birds. The relatedness between social partners did not correlate with the percentage of extra-pair offspring in the brood and there was no difference in heterozygosity between maternal half-siblings. As the first such investigation in this species, this study adds to our understanding of their mating system and will be useful for comparative studies of variations in extra-pair paternity rate.

Male-biased sex of extra pair young in the socially monogamous Red-backed Shrike Lanius collurio

72%

Schwarzova L., Simek J., Coppack T., Tryjanowski P.

Acta Ornithologica

2008

tom 43

nr 2

235-239

Females of many socially monogamous bird species engage in — or even actively seek — copulations outside their social pair bond. However, in socially monogamous birds with low breeding abundance, such as the Red-backed Shrike, extra-pair paternity (EPP) was thought to be an exceptional and random incident. Drawing on samples collected in an unusually dense Red-backed Shrike population in the Czech Republic, we show through DNA microsatellite typing that among 65 chicks from 15 nests, 10 individuals (26.5%) had been sired by males other than the nest-attending social mate. All 10 extra pair young were of male sex. In all cases, genetic fathers of extra pair young stemmed from neighbouring territories. Extra pair fathers had significantly longer tarsi than social mates, indicating that female choice was a function of age-class dependent male body size. Our findings support sex allocation theory, which suggests that promiscuous females mating with higher quality males should produce mostly sons.

Ograniczanie wyników

2 Acta Ornithologica

1 Coppack T.

1 Ju J.

1 Li D.

1 Racey P.

1 Schwarzova L.

1 Simek J.

1 Tryjanowski P.

1 Wan D.

1 Yin J.

1 Zhang L.

1 2014

1 2008

Wyniki wyszukiwania

Extra-pair paternity in Varied Tits Poecile varius

Male-biased sex of extra pair young in the socially monogamous Red-backed Shrike Lanius collurio