Prefledging mass recession in Manx shearwaters: parental desertion or nestling anorexia?
Prefledging mass recession in Manx shearwaters: parental desertion or nestling anorexia?
复制标题
DOI：
10.1006/anbe.2001.1813
复制
发表时间：
2001-10-01
期刊：
影响因子：
2.5
通讯作者：
Hamer, KC
中科院分区：
文献类型：
--
作者：
Gray, CM;Hamer, KC
在许多种类的鸟类中，雏鸟在长出羽毛之前都会经历一段时间的大规模衰退，这与食物供应的大量减少有关。这被归因于父母的遗弃，尽管它同样可能是由于雏鸡自愿限制喂养（即厌食症）造成的。我们研究了马恩岛剪水，Puffinus puffinus，父母和小鸡之间的相互作用，以测试是否prefulling减少喂养父母，小鸡或两者控制。在一个交叉寄养实验中，不同年龄的小鸡在巢间交换。我们预测，在父母控制模式下，交叉寄养不会影响父母的食物供应，但在小鸡控制下，供应水平将根据寄养小鸡的年龄特定的要求进行调整。年长的小鸡放置在巢中的年轻小鸡进入大规模衰退，在年龄较大的时候，有较高的食物供应率比未经处理的小鸡在10天前，羽翼丰满，支持父母的控制模式。年轻的小鸡放置在巢中的老小鸡有较低的羽翼质量比未经处理的小鸡，作为一个结果，较低的食物供应率之前，羽翼丰满，这也支持了这一模型。然而，父母继续喂养年轻的小鸡超过了他们自己的小鸡已经羽翼丰满的日期。这表明，小鸡也影响了食物供应，而大规模的衰退是由于父母相对固定的供应模式和小鸡年龄特定的食物需求之间的相互作用。(C)2001年，动物行为研究协会。
In many species of bird, nestlings undergo a period of mass recession, associated with a large reduction in food provisioning, before they fledge. This has been ascribed to parental desertion, although it could equally result from voluntary limitation of feeding (i.e. anorexia) among chicks. We examined the interactions between Manx shearwater, Puffinus puffinus, parents and chicks, to test whether the prefledging reduction in feeding was controlled by parents, chicks or both. In a cross-fostering experiment, chicks of different ages were exchanged between nests. We predicted that under a parental control model, cross-fostering would have no effect on food provisioning by the parents, but under chick control, the level of provisioning would be adjusted according to the age-specific requirements of the foster chick. Older chicks placed in the nests of younger chicks entered mass recession at an older age and had higher food-provisioning rates than unmanipulated chicks over the 10 days prior to fledging, supporting the parental control model. Younger chicks placed in the nests of older chicks had lower fledging masses than unmanipulated chicks, as a result of lower food-provisioning rates prior to fledging, which also supports this model. However, parents continued to feed younger chicks beyond the date at which their own chick would have fledged. This suggests that chicks also influenced food provisioning, and that mass recession resulted from interactions between a relatively fixed provisioning pattern in parents and age-specific food requirements of chicks. (C) 2001 The Association for the Study of Animal Behaviour.