Dall SRX, Witter MS
Centre for Behavioural Biology, School of Biological Sciences, University of Bristol, U.K.
Anim Behav. 1998 Mar;55(3):715-25. doi: 10.1006/anbe.1997.0749.
We investigated daily changes in body mass, fat reserves and crop contents, and diurnal organization of behaviour, in the zebra finch, Taeniopygia guttata, in relation to experimental manipulations of food availability. Diurnal mass change and the organization of foraging behaviour during the day were in general agreement with recent theoretical predictions. Foraging intensity, and hence rate of mass gain, was most rapid immediately after dawn and before dusk. The experimental birds did not alter either mean body mass or their diurnal mass trajectory after a period of 2 weeks when food was made unavailable for 2 h a day at unpredictable times. Instead, they changed their allocation of time to different activities during the day, decreasing the mean amount of time spent locomoting and increasing the mean amount of time spent inactive over the day. Thus, contrary to a number of recent studies on different species, zebra finches appear to respond to unpredictable interruptions in food supply by reducing energetically expensive activities rather than adjusting their levels of energy reserves. Copyright 1998 The Association for the Study of Animal Behaviour Copyright 1998 The Association for the Study of Animal Behaviour.
我们研究了斑胸草雀（Taeniopygia guttata）的体重、脂肪储备和嗉囊内容物的每日变化，以及行为的昼夜组织，这些变化与食物可获得性的实验操作有关。昼夜体重变化和白天觅食行为的组织总体上与最近的理论预测一致。觅食强度以及体重增加率在黎明后和黄昏前最为迅速。在每天不可预测的时间使食物供应中断2小时，持续2周后，实验鸟的平均体重或昼夜体重轨迹均未改变。相反，它们改变了白天分配给不同活动的时间，减少了移动所花费的平均时间，增加了一天中不活动所花费的平均时间。因此，与最近对其他物种的一些研究相反，斑胸草雀似乎通过减少高能量消耗的活动来应对食物供应的不可预测中断，而不是调整其能量储备水平。版权所有1998动物行为研究协会 版权所有1998动物行为研究协会。
