Hemborg C
Department of Zoology, Uppsala University
Anim Behav. 1998 Nov;56(5):1221-1227. doi: 10.1006/anbe.1998.0885.
In this experimental study, the postnuptial moult in the pied flycatcher, Ficedula hypoleuca, was studied in relation to the timing of the breeding cycle. By exchanging clutches with different laying dates, I either delayed or advanced the breeding cycle. At fledging time, the majority of delayed females started moulting while still feeding the nestlings, while advanced females only rarely did so. The moult of delayed females had also progressed further than that of females in control and advanced groups, respectively. The moult of males had usually progressed further than that of females, but when it started in relation to the breeding cycle did not differ between the study groups. These results suggest that female pied flycatchers have a more fixed timetable for reproduction and moult than males do. The start of moult in females seemed to depend on their original breeding cycle, while the males initiated their moult when the foster brood reached a certain age. A change in the incubation period for females did not affect the hatching success of eggs, but delayed breeding, and extensive moult-breeding overlap imposed fitness costs in terms of fewer fledged young, both absolutely and in relation to clutch size. These findings suggest sexual differences in the mechanisms controlling allocation of resources to reproductive and somatic investments, respectively. Copyright 1998 The Association for the Study of Animal Behaviour.
在这项实验研究中，我们研究了白斑姬鹟（Ficedula hypoleuca）婚后换羽与繁殖周期时间安排的关系。通过交换不同产卵日期的一窝蛋，我要么推迟要么提前了繁殖周期。在雏鸟离巢时，大多数被推迟繁殖的雌鸟在仍在喂养雏鸟时就开始换羽，而提前繁殖的雌鸟很少这样做。被推迟繁殖的雌鸟的换羽进程也分别比对照组和提前繁殖组的雌鸟更进一步。雄鸟的换羽进程通常比雌鸟更进一步，但就繁殖周期而言，其开始时间在各研究组之间并无差异。这些结果表明，与雄鸟相比，雌白斑姬鹟在繁殖和换羽方面有更固定的时间表。雌鸟换羽的开始似乎取决于它们原来的繁殖周期，而雄鸟则在寄养雏鸟达到一定年龄时开始换羽。雌鸟孵化期的改变并不影响卵的孵化成功率，但繁殖推迟以及换羽与繁殖的广泛重叠，无论从绝对数量还是相对于窝卵数而言，都以雏鸟数量减少的形式带来了适合度成本。这些发现表明，在控制资源分配到生殖投资和体细胞投资的机制上存在性别差异。版权所有1998动物行为研究协会。
