PROVISIONING OF NESTLINGS BY MALE AND FEMALE YELLOW-BREASTED CHATS
PROVISIONING OF NESTLINGS BY MALE AND FEMALE YELLOW-BREASTED CHATS
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通过雄性和雌性黄胸雀提供雏鸟
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发表时间：
1998
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通讯作者：
G. Ritchison
中科院分区：
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作者：
Caroline A. Schadd;G. Ritchison
在1994年繁殖季节，在肯塔基州中部的19个黄胸聊天（Icteria virens）巢的父母喂养的角色进行了观察。雄性和雌性聊天喂养雏鸟在类似的利率，成人喂养率不受育雏大小。没有任何变化的喂养率增加育雏大小表明，每雏鸟的食物需求减少育雏大小的增加，也许是因为在体温调节成本的差异。与许多其他研究的结果相反，供应率和负载大小（每次访问的猎物数量）并没有随着雏鸟年龄的增加。然而，我们的观察在聊天巢没有开始，直到雏鸟是3或4天大。对其他物种的研究表明，1-3天大的雏鸟可能比年长的雏鸟更不经常被拜访，并且提供更小的负载，并且在这个早期阶段对雏鸟聊天的观察可能揭示了类似的行为。1996年8月2日收到，1998年4月30日接受。在早期鸟类中，亲鸟为雏鸟提供食物的行为可能受到多种因素的影响.例如，育雏大小和雏鸟年龄的差异可能会导致摄食率或向雏鸟提供的猎物大小和类型的变化。然而，以前的工作揭示了种间差异，父母如何应对这些和其他因素的变化。例如，成年巴赫曼麻雀（Aimophila aestivalis）对大窝的取食次数多于对小窝的取食次数（Haggerty 1992），但成年野麻雀（Spizella pusilla）则不然（Best 1977）。以往的研究也揭示了种间雄性和雌性在提供雏鸟方面各自作用的差异。在某些物种中，雄性和雌性以相似的速度提供雏鸟
Observations of parental feeding roles were made at 19 Yellow-breasted Chat (Icteria virens) nests during the 1994 breeding season in central Kentucky. Male and female chats fed nestlings at similar rates, and adult feeding rates were unaffected by brood size. The absence of any change in feeding rates with increased brood size suggests that food requirements per nestling decrease as brood size increases, perhaps because of differences in thermoregulatory costs. In contrast to the results of many other studies, provisioning rates and load sizes (number of prey delivered per visit) did not increase with nestling age. However, our observations at chat nests did not begin until nestlings were 3 or 4 days old. Studies of other species have revealed that 1-3 day old nestlings may be visited less frequently and provided with smaller loads than older nestlings, and observations of nestling chats during this early period might have revealed similar behavior. Received 2 Aug. 1996, accepted 30 April 1998. Among altricial birds, the behavior of par- ents providing food for nestlings may be in- fluenced by several factors. For example, dif- ferences in brood size and nestling age may contribute to changes in feeding rates or the size and type of prey delivered to nestlings. However, previous work has revealed inter- specific differences in how parents respond to changes in these and other factors. For ex- ample, adult Bachman's Sparrows (Aimophila aestivalis) make more feeding visits to large broods than to small broods (Haggerty 1992), but adult Field Sparrows (Spizella pusilla) do not (Best 1977). Previous studies have also revealed interspecific differences in the re- spective roles of males and females in provi- sioning nestlings. In some species, males and females provision nestlings at similar rates
Tamotsu.S.et al.：J.Comp.Physiol.A.
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