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首页> 外文期刊>Canadian Journal of Zoology >Should I brood or should I hunt: a female barn owl's dilemma
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Should I brood or should I hunt: a female barn owl's dilemma

机译：我应该沉思还是应该狩猎：雌性仓n的困境

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摘要

While brooding, many female raptors rely exclusively on food provisioning from males. Thus, they may forego hunting until young are about half grown before exiting the nest to undertake a first foraging trip. To investigate the mechanisms that trigger this first foraging exit, we analysed nest food provisioning, female body mass change, and nestling and female food requirements in regard to exit date in five pairs of barn owls, Tyto alba (Scopoli, 1769), nesting in eastern France. Adult mass and behaviour were monitored using an automated weighing system and a video camera. Our results indicate that the first foraging exit of the female occurs about 15 days after the hatching of the first egg. This reinitiation of foraging occurs at about the same time that male food provisioning no longer matches nestling food requirements - about 17 days after the hatching of the first egg. Thus the timing of the female's first hunting trip may be primarily adjusted to a discrepancy between brood food requirements and available food supply. Additionally, we found that females started to lose mass, on average, 6 days before their first hunting trip through a reduction of food intake, and we discuss the potential mechanisms and implications.
机译：繁殖时，许多雌性猛禽完全依靠雄性提供食物。因此，他们可能会放弃狩猎，直到年幼的一半长大后才离开巢穴进行第一次觅食之旅。为了调查触发第一次觅食出口的机制，我们分析了五对谷仓猫头鹰Tyto alba（Scopoli，1769年）在巢中的巢食物供应，雌性体重变化以及巢和雌性食物的出口日期要求。法国东部。使用自动称重系统和摄像机监控成人的体重和行为。我们的结果表明，雌性的第一次觅食出口发生在第一个卵孵化后约15天。觅食的这种重新开始大约是在雄性食物供应不再符合雏鸟食物需求的同时发生的-孵化第一个卵后约17天。因此，可以将雌性第一次狩猎旅行的时间主要调整为育雏食物需求与可用食物供应之间的差异。此外，我们发现女性在第一次狩猎旅行开始前平均6天就开始通过减少食物摄入量来减轻体重，并讨论了潜在的机制和影响。

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