Thomas RJ
School of Biological Sciences, University of Sussex, U.K.
Anim Behav. 1999 Feb;57(2):365-369. doi: 10.1006/anbe.1998.0970.
A stochastic dynamic programming (SDP) model offers a general explanation of daily singing routines in birds, but remains almost untested empirically. I examined a central prediction of the SDP model, that a more variable food supply decreases the bird's song output at dawn, relative to its song output at dusk. I provided supplementary food to make the food supply more or less variable over 2-week periods in the territories of free-living European robins Erithacus rubecula. Robins sang relatively less at dawn than at dusk after weeks in which their supplementary food supply was variable, and more at dawn than at dusk after weeks in which their food supplementation was constant. These results provide strong support for the prediction of the SDP model. Copyright 1999 The Association for the Study of Animal Behaviour.
随机动态规划（SDP）模型为鸟类的日常鸣叫规律提供了一个一般性解释，但在实证方面几乎仍未得到检验。我检验了SDP模型的一个核心预测，即相对于黄昏时的鸣叫输出，食物供应变化更大时会降低鸟类黎明时的鸣叫输出。我在自由生活的欧洲知更鸟（欧亚鸲）领地内，在为期两周的时间里提供补充食物，以使食物供应或多或少有所变化。在补充食物供应多变的几周后，知更鸟在黎明时的鸣叫相对比黄昏时少；而在食物补充恒定的几周后，知更鸟在黎明时的鸣叫比黄昏时多。这些结果为SDP模型的预测提供了有力支持。版权所有1999动物行为研究协会。
