Price K
Behavioural Ecology Research Group, Department of Biological Sciences, Simon Fraser University
Anim Behav. 1998 Sep;56(3):571-577. doi: 10.1006/anbe.1998.0832.
For begging to benefit chicks, parents must respond to increased begging by bringing more food. To investigate whether parents change their provisioning in response to begging levels, I enhanced the begging levels of broods of yellow-headed blackbirds, Xanthocephalus xanthocephalus, using recorded vocalizations. In a short-term experiment, females and males doubled their visits to broods without reducing their load sizes during 2 h of playback. Nestlings gained more mass during the playback period than during a 2-h control period. In a long-term experiment, nestlings gained more mass in nests from which begging calls were broadcast over a 5-day period than nestlings in nests without playback. Copyright 1998 The Association for the Study of Animal Behaviour.
为了使乞食行为对雏鸟有益，亲鸟必须通过带回更多食物来回应增加的乞食行为。为了研究亲鸟是否会根据乞食水平改变它们的育雏行为，我使用录制的叫声提高了黄头黑鹂（Xanthocephalus xanthocephalus）雏鸟的乞食水平。在一项短期实验中，在播放2小时的过程中，雌鸟和雄鸟对雏鸟的探访次数增加了一倍，且没有减少它们带回食物的量。在播放期间，雏鸟比在2小时的对照期内体重增加得更多。在一项长期实验中，在5天时间里播放乞食叫声的鸟巢中的雏鸟比没有播放的鸟巢中的雏鸟体重增加得更多。版权所有1998年动物行为研究协会。
