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Seasonal breeding in the Italian sparrow: Plasma androgen levels and spermatogenesis

机译:意大利麻雀中的季节性育种:血浆雄激素水平和精子发生

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摘要

In this research we studied the spermatogenesis and circulating androgen levels in the male Italian sparrow. A seasonal pattern is shown, and evidence is provided that the Italian sparrow has multiple-clutch breeding activity. In particular, we have observed a winter resurgence of testicular activity, as indicated by active spermatogenesis and a relatively higher plasma androgen level as compared to the summer hormone levels. No breeding males were ever observed during the winter period, and an apparent resurgence of gametogenesis may simply be considered as a transient phenomenon. We suggest that multiple-clutch breeding activity and transient winter resurgence of spermatogenesis reflect the derivation of this species from an ancestral population, probably the progenitors of P. hispaniolensis, spread from Africa to the Italian peninsula.
机译:在这项研究中,我们研究了男性意大利麻雀中的精子发生和循环雄激素水平。 显示了一种季节性模式,并提供了意大利麻雀具有多离合器育种活性的证据。 特别是,与夏季激素水平相比,我们已经观察到睾丸活性的冬季复活,这表明了活性精子发生和相对较高的血浆雄激素水平。 在冬季,从未观察到任何繁殖雄性,并且可以将配子发生的明显复兴视为瞬态现象。 我们建议,精子发生的多插育活性和短暂的冬季复兴反映了该物种从祖先人群中推导的,可能是西班牙裔疟原虫的祖细胞,从非洲传播到意大利半岛。

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