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首页> 外文期刊>The Wilson Bulletin >REGULATION OF GROWTH IN RED KITES AND IMPERIAL EAGLES
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REGULATION OF GROWTH IN RED KITES AND IMPERIAL EAGLES

机译:红脚和帝鹰的生长调节

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We analyzed variability in growth of Red Kite (Milvus milvus) chicks using biometrical measures and urea and alkaline phosphatase blood levels. We used variables estimating relative mass and tarsus length growth rates during the 5-7 days before every blood extraction (short-term growth) and deviations of size (mass and tarsus length) from population averages at the age of blood extraction (long-term growth). We found a significant relationship between blood levels of alkaline phosphatase and short-term tarsus growth rate but not with long-term tarsus growth. Urea levels were correlated with long-term mass growth but not with short-term growth. We found some chicks with relatively rapid mass growth, slow tarsus growth, and low levels of alkaline phosphatase after periods of fasting. Chicks of Imperial Eagles (Aquila adalberti) showed less variable nestling periods but higher and more variable blood urea levels. These differences agree with theoretical predictions about the evolution of growth regulation abilities in relation to feeding ecology: the species with a more variable growth and more resistence to food deprivation can experience a more irregular and unpredictable food supply.
机译:我们使用生物计量学方法以及尿素和碱性磷酸酶血液水平分析了红风筝(Milvus milvus)雏鸡的生长变异性。我们使用变量来估计每次抽血前5-7天的相对质量和sus架长度的增长率(短期生长),以及抽血年龄(长期的)与人群平均数的大小偏差(质量和架长度)增长)。我们发现血液中碱性磷酸酶的水平与短期骨生长速率之间存在显着关系,但与长期骨生长无关。尿素水平与长期的质量增长相关,而与短期的增长不相关。我们发现一些雏鸡在禁食一段时间后质量增长相对较快,架生长较慢,碱性磷酸酶水平较低。帝鹰(Aquila adalberti)的雏鸡显示出较小的雏鸟成长期,但血液中的尿素水平较高且变化较大。这些差异与关于与饲料生态有关的生长调节能力演变的理论预测相吻合:具有更多变化的生长和对食物匮乏具有更大抵抗力的物种可能会经历更加不规则和不可预测的食物供应。

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