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迁徙黄腰白喉带鹀对限食的消化反应

Digestive response to restricted feeding in migratory yellow-rumped warblers.

作者信息

Lee Kelly A, Karasov William H, Caviedes-Vidal Enrique

机构信息

Zoology Department, University of Wisconsin, Madison, WI, 53706, USA.

出版信息

Physiol Biochem Zool. 2002 May-Jun;75(3):314-23. doi: 10.1086/342003.

Abstract

Smaller guts and slow initial mass gains at stopover sites have led to the idea that digestive physiology limits refueling rates in migrating birds. We tested the digestive-limitation hypothesis in yellow-rumped warblers using food restriction to simulate infrequent feeding during migration, which may cause a reduction in alimentary tract mass. Restricted birds had small intestine, pancreas, and liver masses 18%-22% lower than ad lib.-fed controls. Total activities of sucrase, maltase, aminopeptidase, and amylase were significantly lower in restricted birds, while those of trypsin and chymotrypsin were not. Only aminopeptidase mass-specific activity was significantly lower in restricted birds. Previously restricted birds were able to feed and digest at a high rate immediately following return to ad lib. feeding. Digestive efficiency did not differ between groups. These results suggest that before migration yellow-rumped warblers have some spare digestive capacity to compensate for declines in their digestive organ masses during migration.

摘要

较小的肠道以及在中途停歇地初期体重增加缓慢,这引发了一种观点,即消化生理机能限制了候鸟的加油速率。我们通过食物限制来模拟候鸟迁徙期间进食频率较低的情况(这可能导致消化道质量下降),对黄腰林莺的消化限制假说进行了测试。受限的黄腰林莺的小肠、胰腺和肝脏质量比自由进食的对照组低18% - 22%。受限黄腰林莺的蔗糖酶、麦芽糖酶、氨肽酶和淀粉酶的总活性显著较低,而胰蛋白酶和糜蛋白酶的活性则没有。只有受限黄腰林莺的氨肽酶质量比活性显著较低。之前受限的黄腰林莺在恢复自由进食后能够立即以较高的速率进食和消化。两组之间的消化效率没有差异。这些结果表明,在迁徙之前,黄腰林莺具有一定的备用消化能力,以补偿其在迁徙过程中消化器官质量的下降。

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