LOAD-LIGHTENING IN COOPERATIVELY BREEDING BIRDS AND THE COST OF REPRODUCTION
LOAD-LIGHTENING IN COOPERATIVELY BREEDING BIRDS AND THE COST OF REPRODUCTION
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DOI：
10.1111/j.1474-919x.1992.tb07230.x
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发表时间：
1992-01-01
期刊：
影响因子：
2.1
通讯作者：
CRICK, HQP
中科院分区：
文献类型：
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作者：
CRICK, HQP
在合作繁殖的鸟类中，帮助它们的人通常会“减轻”繁殖者的负担，因为它们可以减少繁殖者的工作量。当生存成本和供给努力之间的关系的形状是隐藏的，那么对于给定数量的帮助，帮助者只会导致死亡率的小幅增加，但繁殖者会从死亡率的大幅下降中受益。前繁殖者之间的凸性关系可以解释为什么一些群体（如幼虫）不合作繁殖。减轻负荷可以通过增加相关育种者的寿命和终生繁殖成功率，为帮助者未来的间接适应性提供显著的额外收益。
Helpers at the nest of cooperatively breeding birds often 'lighten-the-load' of the breeders, by allowing them to decrease their effort. When the shape of the relationship between survival cost and provisioning effort is concave-up then a helper incurs only a small increment in mortality, for a given amount of help, but the breeder benefits from a larger fall in mortality. A convex-up relationship for pre-breeders may explain why some groups (such as larids) do not breed cooperatively. Load-lightening could provide significant extra gains to the helper's future indirect fitness by increasing the lifespan and life-time reproductive success of related breeders.