Nutritional stress and body condition in the Great Gray Owl (Strix nebulosa) during winter irruptive migrations
Nutritional stress and body condition in the Great Gray Owl (Strix nebulosa) during winter irruptive migrations
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大灰猫头鹰（Strix nebulosa）冬季侵入性迁徙期间的营养压力和身体状况
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发表时间：
2012
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通讯作者：
L. FogelMarilyn
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作者：
R. GravesGary;D. NewsomeSeth;E. WillardDavid;A. GrosshueschDavid;W. WurzelWilliam;L. FogelMarilyn
2004-2005年冬季，美国明尼苏达州发生了自1831年以来记录的最大规模的大灰猫头鹰（Strix nebulosa Forster，1772）入侵性迁徙。我们测试了这一假设，即营养压力的形态指标与稳定同位素签名的样本中的265猫头鹰死于车辆碰撞。肌肉中的碳氮比（C/Nmuscle）被证明是营养胁迫的可靠指标。在条件差的猫头鹰中，肝脏和肌肉的δ 13 C值显著较高，反映了禁食个体的脂质储备消耗。另一方面，在条件差的猫头鹰中，肝脏和肌肉的δ 15 N值略微降低或不变。瘦弱猫头鹰的胃不太可能容纳猎物，这意味着许多营养紧张的个体太虚弱而无法狩猎，并且接近不可逆转的禁食临界点。在更广泛的背景下，性别差异之间的相关关系稳定同位素签名，C/N，和…
The largest irruptive migration of the Great Gray Owl (Strix nebulosa Forster, 1772) recorded since 1831 occurred in Minnesota, USA, during the winter of 2004–2005. We tested the hypothesis that morphometric indicators of nutritional stress covary with stable isotope signatures in a sample of 265 owls killed by vehicle collisions. The ratio of carbon to nitrogen in muscle (C/Nmuscle) was shown to be a reliable proxy of nutritional stress. δ13C values for liver and muscle were significantly higher in owls in poor condition, reflecting the depletion of lipid reserves in fasting individuals. On the other hand, δ15N values for liver and muscle were marginally lower or unchanged in owls in poor condition. Stomachs of emaciated owls were less likely to contain prey, implying that many nutritionally stressed individuals were too weak to hunt and were near the tipping point of irreversible fasts. In a broader context, sexual differences in the correlative relationships between stable isotope signatures, C/N, and ...