USE OF SUPPLEMENTAL FOOD BY BREEDING ROSS'S GEESE AND LESSER SNOW GEESE: EVIDENCE FOR VARIABLE ANOREXIA
USE OF SUPPLEMENTAL FOOD BY BREEDING ROSS'S GEESE AND LESSER SNOW GEESE: EVIDENCE FOR VARIABLE ANOREXIA
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通过饲养罗斯雁和小雪雁来使用补充食物：可变性厌食症的证据
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
Alan D Afton
中科院分区：
文献类型：
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作者：
Mark L. Gloutney;R. Alisauskas;K. Hobson;Alan D Afton
最近的研究表明，在产卵和孵化期间吃的食物在为北极筑巢鹅提供能量和营养方面比以前认为的起更大的作用。本研究以罗斯鹅和小雪雁为试验对象，进行了饲料补充试验。（2）食物消耗如何影响繁殖鹅体组织的质量动态，（3）质量损失的模式是否与禁食适应一致，（4）能量限制是否会导致较小的罗斯鹅比较大的雪雁相对于其体型摄取更多的食物。在产卵期和孵化期，两种鸟的摄食量在个体间差异很大。产蛋期间补充食物的消耗导致对照组和处理组雌性之间整体身体组成的差异。治疗雌性罗斯鹅完成了更高的质量和更多的腹部脂肪比对照组，而治疗雌性雪雁完成了更重的胸部肌肉和心脏奠定。在孵化结束时，对照组和处理组鹅（性别和物种）的总体身体组成没有差异，但处理组鹅的心脏比对照组鹅重。这表明，处理组雌性动物不像对照组那样依赖与厌食症相关的代谢适应来满足孵化的能量成本。稳定氮同位素分析显示，在孵育过程中的蛋白质维持模式与长期禁食的代谢适应一致。我们的预测，能量的限制将导致较小的罗斯鹅消耗更多的食物相对于他们的大小比雪雁不支持。罗斯鹅的特定群体食物消耗量
Recent research suggests that foods eaten during laying and incubation play a greater role in supplying energy and nutrients to arctic-nesting geese than previously be- lieved. We conducted food-supplementation experiments with Ross's Geese (Chen rossii) and Lesser Snow Geese (C. caerulescens) geese to evaluate: (1) if supplemental food was consumed by laying and incubating geese, (2) how food consumption influenced mass dynamics of somatic tissues of breeding geese, (3) if patterns of mass loss were consistent with fasting adaptations, and (4) whether energetic constraints would cause smaller Ross's Geese to con- sume more food relative to their body size than would larger Snow Geese. Quantity of sup- plemental food eaten by both species during laying and incubation was highly variable among individuals. Consumption of supplemental food during laying resulted in differ- ences in overall body composition between control and treatment females. Treatment female Ross's Geese completed laying at a higher mass and with more abdominal fat than controls, whereas treatment female Snow Geese completed laying with heavier breast muscles and hearts. Overall body composition did not differ between control and treatment geese (both sexes and species) at the end of incubation, but treatment geese had heavier hearts than con- trol geese. This suggests that treatment females did not rely to the same extent on metabolic adaptations associated with anorexia to meet energetic costs of incubation as did controls. Stable-nitrogen isotope analysis revealed patterns of protein maintenance during incubation consistent with metabolic adaptations to prolonged fasting. Our prediction that energetic constraints would cause smaller Ross's Geese to consume more food relative to their size than would Snow Geese was not supported. Mass-specific food consumption by Ross's Geese