PATCH USE IN CRANES: A FIELD TEST OF OPTIMAL FORAGING PREDICTIONS
PATCH USE IN CRANES: A FIELD TEST OF OPTIMAL FORAGING PREDICTIONS
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DOI：
10.1006/anbe.1995.0167
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发表时间：
1995-05-01
期刊：
影响因子：
2.5
通讯作者：
MUNOZPULIDO, R
中科院分区：
文献类型：
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作者：
ALONSO, JC;ALONSO, JA;MUNOZPULIDO, R
边际价值定理指出，当瞬时捕获率下降到栖息地的平均捕获率时，觅食者应该留下斑块。这预示着斑块停留时间随着斑块质量的增加而增加，随着生境质量的增加而减少。这些预测和其他预测来自有先见之明的、贝叶斯和固定时间模型，通过对14只带有无线电标记的自由生活的普通鹤在谷类农田中觅食的观察来验证。鹤的行为就像是贝叶斯觅食者。它们在离开斑块时的摄食率随斑块和生境质量的不同而变化。鹤的行为与边际价值理论的预测是一致的，只有在能量回报低于满足日常食物需求的斑块。相比之下，鸟类离开富饶的斑块的时间比预期的要早，取食率也高于贫瘠的斑块；此外，鹤在较大的鸟群中停留的时间更长。这些结果表明，鹤根据它们预期的能量平衡改变了它们的觅食规则。
The marginal value theorem states that foragers should leave patches when the instantaneous capture rate has fallen to the average capture rate for the habitat. This predicts that patch residence time should increase with increasing patch quality and decrease with increasing habitat quality. These and other predictions from prescient, Bayesian and fixed-time models were tested using observations on 14 radio-tagged free-living common cranes, Grus grus, foraging in cereal farmland. Cranes behaved as Bayesian foragers. Their intake rates on leaving patches changed with patch and habitat quality. The behaviour of cranes was consistent with marginal value theorem predictions only in patches where energy return was lower than required to meet daily food requirements. In contrast, birds left richer patches earlier than expected and at higher intake rates than poor patches; In addition, cranes stayed longer in larger flocks. These results suggest that cranes changed their foraging rules according to their expected energy balance.