家麻雀（Passer domesticus）繁殖与一种依赖于身体状况的性选择装饰之间的权衡。
A trade-off between reproduction and a condition-dependent sexually selected ornament in the house sparrow Passer domesticus.
作者信息
Griffith S C
机构信息
Department of Evolutionary Biology, Evolutionary Biology Centre, Uppsala University, Sweden.
出版信息
Proc Biol Sci. 2000 Jun 7;267(1448):1115-9. doi: 10.1098/rspb.2000.1116.
Reproductive effort was manipulated in a free-living population of house sparrows (Passer domesticus) to investigate the trade-off between reproductive investment and the expression of a condition-dependent sexually selected ornament. Phenotypic plasticity in the expression of this trait was related to the experimentally manipulated size of the brood reared by a male. Males that invested more in current reproduction subsequently became more attractive to females in this population as they showed a preference for males with smaller badges. This supports the argument that direct benefits are a primary focus for mate choice by females. Trade-offs between reproductive effort and the expression of sexual ornaments are a potentially important source of phenotypic variation in both sexual ornaments and life-history traits.
在自由生活的家麻雀（Passer domesticus）种群中，对繁殖投入进行了操控，以研究繁殖投资与依赖条件的性选择装饰表达之间的权衡。该性状表达的表型可塑性与雄性所养育雏鸟的实验操控规模有关。在当前繁殖中投入更多的雄性，在该种群中随后对雌性变得更具吸引力，因为雌性表现出对具有较小饰章的雄性的偏好。这支持了这样一种观点，即直接利益是雌性配偶选择的主要关注点。繁殖投入与性装饰表达之间的权衡，是性装饰和生活史性状表型变异的一个潜在重要来源。
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