Breeding ecology and bias in offspring sex ratio in little grassbirds (Megalurus gramineus)
Breeding ecology and bias in offspring sex ratio in little grassbirds (Megalurus gramineus)
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DOI：
10.1071/zo03002
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发表时间：
2003
影响因子：
0.8
通讯作者：
R. McIntosh;R. Kats;M. Berg;J. Komdeur;M. Elgar
中科院分区：
文献类型：
--
作者：
R. McIntosh;R. Kats;M. Berg;J. Komdeur;M. Elgar
小草鸟（Megalurus gramineus）是一种小型的性单态雀形目鸟类，生活在澳大利亚南部的芦苇床、木质沼泽和盐沼中。在一个繁殖季节内，对小草鸟的繁殖生物学和性别分配模式进行了研究。我们在Edithvale湿地保护区对这一物种的观察发现了一个高度男性偏见的人口性别比，一些繁殖区含有几个额外的男性。然而，几乎没有令人信服的证据表明小草鸟合作繁殖。雄性和雌性雏鸟的生长速度相似，并根据理论预测，没有总体的初级性别比偏差。然而，主要的性别比例是女性偏向早期的繁殖季节，并成为越来越多的男性偏向后期的繁殖季节。
Little grassbirds (Megalurus gramineus) are small, sexually monomorphic passerines that live in reed beds, lignum swamps and salt marshes in southern Australia. The breeding biology and patterns of sex allocation of the little grassbird were investigated over a single breeding season. Our observations of this species in the Edithvale Wetland Reserve revealed a highly male-biased population sex ratio, with some breeding territories containing several additional males. Nevertheless, there was little compelling evidence that little grassbirds breed cooperatively. The growth rates of male and female nestlings were similar and, as predicted by theory, there was no overall primary sex ratio bias. However, the primary sex ratio was female-biased early in the breeding season and became increasingly male-biased later in the breeding season.