Differences in prey selection and behaviour during self-feeding and chick provisioning in rhinoceros auklets
Differences in prey selection and behaviour during self-feeding and chick provisioning in rhinoceros auklets
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DOI：
10.1006/anbe.1999.1209
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发表时间：
1999-10-01
期刊：
影响因子：
2.5
通讯作者：
Burger, AE
中科院分区：
文献类型：
--
作者：
Davoren, GK;Burger, AE
我们确定了海洋潜水鸟，犀牛小鸟，Cerorhinca monocerata，是否使用不同的觅食行为，并为其幼崽收集不同的猎物，而不是喂自己。通过进行视觉扫描来确定觅食行为，通过收集交付给雏鸟的鱼和在小海雀自我喂养的地方收集鱼来采样猎物，这一点得到了另外两个信息来源的证实。成年奥卡鱼捕食小鱼(59.1+/-0.5 mm，N=547)，包括太平洋沙鱼幼鱼、六头金枪鱼和太平洋鲱鱼(Clupea Harengus)，但捕获较大的鱼来喂养幼鱼(95.2+/-1.3 mm，N=321)，主要包括太平洋沙枪、太平洋鲱鱼、太平洋鲑鱼物种、Oncorhynchus spp.和冲浪气味Hypomesus pretiosus。此外，小海雀主要通过在1600小时前以混合物种的群体潜水来为自己捕鱼，而在1600小时后通过单独潜水来捕鱼来喂养幼鸟。这表明，与为雏鸟提供食物而捕鱼时相比，小海雀在收集鱼类自我喂养时改变了觅食行为和猎物选择。几项鸟类研究记录了成年和雏鸟的不同饮食，但这是第一次直接观察和记录成年和雏鸟供应中使用的不同觅食行为。我们强调在觅食和生活史研究中区分自我喂养和雏鸡供应的重要性。(C)1999年动物行为研究协会。
We determined whether a marine diving bird, the rhinoceros auklet, Cerorhinca monocerata, used different foraging behaviour and collected different prey items for its young than when feeding itself. Foraging behaviour was determined by conducting visual scans, and prey items were sampled by collecting fish delivered to chicks and by collecting fish where auklets were self-feeding, which was verified by two other sources of information. Adult auklets ate small fish (59.1 +/- 0.5 mm, N=547), including juvenile Pacific sand lance, Ammodytes hexapterus, and Pacific herring, Clupea harengus, but collected larger fish to feed their chicks (95.2 +/- 1.3 mm, N=321), including primarily Pacific sand lance, Pacific herring, Pacific salmon species, Oncorhynchus spp., and surf smelt, Hypomesus pretiosus. In addition, auklets collected fish for themselves primarily by diving in mixed-species feeding flocks before 1600 hours, whereas they collected fish to feed their chicks by diving solitarily after 1600 hours. This suggests that auklets switched both foraging behaviour and prey selection when collecting fish for self-feeding, compared with when collecting fish for chick provisioning. Several avian studies have documented different diets of adults and chicks, but this is the first research to observe directly and document different foraging behaviour used in adult and chick provisioning. We emphasize the importance of distinguishing between self-feeding and chick provisioning in foraging and life history studies. (C) 1999 The Association for the Study of Animal Behaviour.