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Winter Fat Storage and Vertical Microenvironmental Gradients: Experimental Test of an Alternative Hypothesis

机译:冬季脂肪储存和垂直微环境梯度:替代假设的实验测试

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Cost-benefit optimal body mass models have become a cornerstone of behavioral ecology of the nonbreedingperiod of birds, and make the prediction that fat will increase with increasing deterioration of feeding conditions. Tests ofthis prediction have relied on comparing fat stores of birds along a vertical height gradient of resource unpredictability(greater snowfall nearer the ground), and lower fat levels in tree-feeders compared with ground-feeders supported the predictionin previous studies. Alternatively, as predation risk is often cited as a cost of fat storage, lower fat stores may becaused by greater predation risk higher in the vertical resource gradient compared with the ground microenvironment.Among three species of tree-feeding birds wintering in south-central Kansas, foraging birds frequently preferred a highersunflower feeder over a similar lower one, with blind and microenvironmental effects considered indirectly. Interspecificdominance rank was significantly and positively correlated with body size. Social dominants frequently displaced subordinatesfrom the higher to the lower feeder. Thus a minimum of fat in tree-feeding species that can be explained by predictableresources (low snowfall), not high costs, underscoring the low benefit to fat in this winter foraging guild. Futureresource-based tests of optimal fat models will need to measure both costs and benefits of fat in different winter foragingguilds.
机译:成本效益最佳体重模型已成为鸟类非繁殖期行为生态学的基石,并做出了随着摄食条件恶化而脂肪增加的预测。对该预测的测试依赖于在资源不可预测性(靠近地面的更大降雪)的垂直高度梯度上比较鸟类的脂肪储藏量,并且与以前的研究相比,与地面饲养者相比,树木饲养者的脂肪含量较低。另外,由于掠食风险经常被认为是脂肪储存的成本,因此与地面微环境相比,垂直资源梯度中较高的更大捕食风险可能是脂肪减少的原因之一。在堪萨斯中南部越冬的三种树食鸟类,觅食的鸟类通常更喜欢使用较高的向日葵喂食器,而不是类似的较低的向日葵喂食器,而间接地考虑了盲目和微环境的影响。种间优势等级与体型显着正相关。社会支配者经​​常使下属从上流社会转移到下流社会。因此,可以通过可预测的资源(低降雪)而不是高成本来解释树木采食物种中的最低脂肪,强调了在这个冬季觅食行会中对脂肪的益处较低。基于未来资源的最佳脂肪模型测试需要衡量不同冬季觅食行会中脂肪的成本和收益。

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