Stable isotopes document the winter foraging ecology of king penguins and highlight connectivity between subantarctic and Antarctic ecosystems.
Stable isotopes document the winter foraging ecology of king penguins and highlight connectivity between subantarctic and Antarctic ecosystems.
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DOI：
10.1002/ece3.3883
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发表时间：
2018-03
影响因子：
2.6
通讯作者：
Bost CA
中科院分区：
文献类型：
--
作者：
Cherel Y;Parenteau C;Bustamante P;Bost CA
为人所知甚少的王企鹅（南大洋的主要消费动物）的冬季觅食生态，在亚南极的克罗泽群岛进行了调查，那里是全球最大的种群繁殖地。血液δ13C和δ15N值分别代表了鸟类的觅食栖息地和饮食，循环催乳素水平有助于确定鸟类的繁殖状况。血浆催乳素浓度表明，冬季出现在种群中的未知繁殖状态的成年王企鹅（n = 52）实际上是繁殖者和失败的繁殖者，但不是非繁殖者。循环催乳素与δ13C和δ15N值无关，表明繁殖者和失败繁殖者使用相同的觅食栖息地，以相同的猎物为食。血浆和血细胞同位素值描述了王企鹅在关键冬季进食策略的四个新的相关生物学特征：(1) 42%的鸟在南极远海觅食，58%的鸟主要在亚南极水域（δ13C）觅食；(2)两个区域（δ15N）都捕食孢子虫；(3)个体在冬季的觅食策略一致（δ13C和δ15N）；(4)雌性（77% ~ 80%）比雄性（27% ~ 31%）更倾向于在南极远海（δ13C）觅食。这项研究强调了亚南极和南极生态系统之间的营养连通性，因此，从南极水域输出的能量在维持亚南极捕食者的繁殖种群中发挥了关键作用，包括在南方冬季。
The poorly known winter foraging ecology of the king penguin, a major Southern Ocean consumer, was investigated at the subantarctic Crozet Islands where the largest global population breeds. Blood δ13C and δ15N values were used as proxies of the birds’ foraging habitat and diet, respectively, and circulating prolactin levels helped in determining the birds’ reproductive status. Plasma prolactin concentrations showed that king penguin adults of unknown breeding status (n = 52) that were present at the colony in winter were in fact breeders and failed breeders, but were not non ‐breeders. Circulating prolactin was neither related to δ13C nor δ15N values, thus suggesting that both breeders and failed breeders used the same foraging habitats and fed on the same prey. Plasma and blood cell isotopic values depicted four new relevant biological features on the feeding strategies of king penguins during the critical winter period: (1) 42% of the birds foraged in the distant Antarctic Zone, but 58% fed primarily in subantarctic waters (δ13C), (2) they preyed upon myctophids in both zones (δ15N), (3) individuals were consistent in their foraging strategies over the winter months (δ13C and δ15N), and (4) a higher proportion of females (77%–80%) than males (27%–31%) favored feeding in distant Antarctic waters (δ13C). This study highlights trophic connectivity between subantarctic and Antarctic ecosystems and hence the key role of energy export from Antarctic waters to sustain breeding populations of subantarctic predators, including during the Austral winter.
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DOI：
10.1016/j.jembe.2013.06.021
发表时间：
2013-10-01
影响因子：
2
作者：
Barquete, Viviane;Strauss, Venessa;Ryan, Peter G.
通讯作者：
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影响因子：
5.2
作者：
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发表时间：
2007-01-01
影响因子：
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作者：
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通讯作者：
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影响因子：
2.5
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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