Foraging trip decisions by the streaked shearwater Calonectris leucomelas depend on both parental and chick state
Foraging trip decisions by the streaked shearwater Calonectris leucomelas depend on both parental and chick state
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DOI：
10.1007/s10164-009-0187-3
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发表时间：
2010-05
影响因子：
0.9
通讯作者：
D. Ochi;N. Oka;Y. Watanuki
中科院分区：
文献类型：
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作者：
D. Ochi;N. Oka;Y. Watanuki
信天翁和海鸥的父母采用双重觅食策略，在重复的短途旅行中快速喂养雏鸟，然后在长途旅行中恢复自己的燃料储备。父母身体状况的下降被认为是引发长途旅行的原因，但雏鸟的身体状况和年龄也可能起作用。为了研究这些因素，我们在2005年使用自动识别系统监测了Mikura岛17对斑纹鹱的筑巢情况。我们还使用自动称重系统监测了17对中的5对的体重变化和膳食质量。虽然鸟类没有表现出明显的双重觅食模式，但旅行时间在1至15天之间变化很大。平均而言，这些鸟在夜间每隔2.74天喂给雏鸟67.6克。由于膳食质量不取决于旅行时间，喂养效率（每单位旅行时间交付的膳食质量）随着旅行时间的增加而降低。父母的旅行时间越长，他们积累的能量储备就越多。当父母的身体状况下降或雏鸟的身体状况恢复时，他们可能会开始更长时间的旅行。
Parents of albatross and shearwater species employ a dual foraging strategy, feeding their chicks quickly in repeated short trips and then restoring their own fuel reserves during longer trips. A decline in parental body condition is believed to trigger longer trips, but chick body condition and age may also play a role. To investigate these factors in the little-studied streaked shearwaterCalonectris leucomelas, we monitored the nest attendance of 17 pairs on Mikura Island in 2005 using an automated identification system. We also monitored body mass changes and meal masses of 5 of the 17 pairs using an automated weighing system. Although the birds did not show a clear dual foraging pattern, trip duration varied widely from 1 to 15 days. On average, the birds fed chicks 67.6 g during nighttime meals at 2.74-day intervals. Since meal mass did not depend on trip duration, feeding efficiency (meal mass delivered per unit trip duration) decreased as trip duration increased. Parents accumulated more energy reserves when they took longer trips. Parents appeared likely to initiate longer trips when their body condition declined or chick body condition recovered.