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首页> 外文期刊>Polar biology >What's for dinner mom? Selective provisioning in southern rockhopper penguins (Eudyptes chrysocome)
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What's for dinner mom? Selective provisioning in southern rockhopper penguins (Eudyptes chrysocome)

机译：妈妈晚饭吃什么南部岩hopper企鹅的选择性供应（Eudyptes chrysocome）

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摘要

Breeding seabirds must balance self-care and reproduction, especially once offspring have hatched and have to be fed regularly. Seabirds may selectively provision chicks with higher quality food than they consume themselves. In contrast, adults may prioritize their survival rather than their progeny by feeding chicks with lower quality prey items than they feed themselves. We examined the parental provisioning strategies of southern rockhopper penguins at Isla de los Estados in 2012 using nitrogen (delta N-15) and carbon (delta C-13) stable isotope analysis to determine if selective provisioning and foraging habitat differences exist between parents and their offspring. We found that chicks had higher delta N-15 values compared to both male and female penguins, and female had slightly higher delta N-15 values compared to male penguins. There was also a strong positive relationship in delta N-15 values between female penguins and their offspring, indicating that chicks' diet resembles the female parent more than the male parent. Our results support the hypothesis of selective provisioning of chicks with higher trophic level (i.e., delta N-15 value) prey and the observation that females exclusively feed chicks during the guard stage. We did not find differences in delta C-13 values between adult and chicks suggesting no differences in the areas or habitats used to forage for self-provisioning and chick-provisioning. These findings likely have broader significance as provisioning rates and quality of food consumed by chicks is often strongly related to chick growth and survival.
机译：繁殖海鸟必须在自我照顾和繁殖之间取得平衡，尤其是在后代孵化并必须定期喂养之后。海鸟可能会选择性地为小鸡提供比他们自己食用更高质量的食物。相比之下，成年鸡可以通过给雏鸡饲喂质量比自己低的猎物来优先考虑生存而不是后代。我们使用氮（δN-15）和碳（δC-13）稳定同位素分析研究了2012年伊斯拉德洛斯埃斯塔多斯岛南部凤冠企鹅的父母提供策略，以确定父母与它们之间是否存在选择性提供和觅食栖息地差异后代。我们发现，与雄性和雌性企鹅相比，小鸡具有更高的ΔN-15值，与雄性企鹅相比，雌性具有更高的ΔN-15值。雌性企鹅与其后代之间的N-15值之间也存在很强的正相关关系，这表明小鸡的饮食更像雌性父母，而不是雄性父母。我们的结果支持以下假设：选择性供应具有较高营养水平（即N-15值）的雏鸡，并观察到雌性在守卫阶段只喂雏鸡。我们没有发现成年和雏鸡之间的C-13值存在差异，这表明用于自我饲养和雏鸡觅食的面积或栖息地没有差异。这些发现可能具有更广泛的意义，因为小鸡消耗的食物供应率和食物质量通常与小鸡的生长和存活密切相关。

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  • 来源
    《Polar biology》 |2019年第8期|1529-1535|共7页
  • 作者

    Rosciano Natalia G.; Polito Michael J.; Rey Andrea Raya;

  • 作者单位

    Consejo Nacl Invest Cient & Tecn, Ctr Austral Invest Cient, Ecol & Conservac Vida Silvestre, Bernardo A Houssay 200,V9410CAB, Ushuaia, Tierra Fuego, Argentina;

    Louisiana State Univ, Dept Oceanog & Coastal Sci, Baton Rouge, LA 70803 USA;

    Consejo Nacl Invest Cient & Tecn, Ctr Austral Invest Cient, Ecol & Conservac Vida Silvestre, Bernardo A Houssay 200,V9410CAB, Ushuaia, Tierra Fuego, Argentina|Univ Nacl Tierra del Fuego, Inst Ciencias Polares Ambiente & Recursos Nat, Ushuaia, Tierra Fuego, Argentina;

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  • 正文语种 eng
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  • 关键词

    Parental provisioning; Eudypteschrysocome; Stable isotopes; Isla de los Estados;

    机译：父母局部;eudypteschrysocome;稳定同位素;州的岛屿;

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