Burford JE, Friedrich TJ, Yasukawa K
Department of Biology, Beloit College
Anim Behav. 1998 Sep;56(3):555-561. doi: 10.1006/anbe.1998.0830.
Nestling birds may honestly signal their need for food to provisioning adults, or begging might be a manipulative attempt to coerce additional food from providers, but in either case, providers respond to an increase in begging with an increase in feeding. We used playback of begging calls recorded from nestlings to determine whether male and female red-winged blackbirds increase their feeding rates in response to an apparent increase in begging. Both females and males fed broods at significantly higher rates after 5-min begging call playbacks than before, although only eight of 30 males were observed to feed nestlings in this study. In contrast, using the same playback design, neither females nor males altered their feeding rates significantly in response to broadcasts of noise. These results and others suggest that begging vocalizations are a basis for short-term adjustments in the rate at which nestling birds are provisioned. These results are also compared with those of a similar study of the same species, in which playback had no significant effect on rates of provisioning. Copyright 1998 The Association for the Study of Animal Behaviour.
雏鸟可能会诚实地向提供食物的成鸟发出需要食物的信号，或者乞食可能是一种操纵行为，试图从提供者那里获取更多食物，但无论哪种情况，提供者都会随着乞食行为的增加而增加喂食量。我们使用从雏鸟录制的乞食叫声回放，来确定雄性和雌性红翅黑鹂是否会因明显增加的乞食行为而提高它们的喂食率。在播放5分钟的乞食叫声后，雌性和雄性喂食雏鸟的速度都比之前显著提高，尽管在这项研究中，30只雄性中只有8只被观察到会喂食雏鸟。相比之下，使用相同回放设计时，雌性和雄性对噪音广播都没有显著改变它们的喂食率。这些结果以及其他结果表明，乞食叫声是雏鸟被喂食速度短期调整的一个依据。这些结果还与对同一物种的一项类似研究结果进行了比较，在该研究中，回放对喂食率没有显著影响。版权所有1998年动物行为研究协会。
