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Assigning hatchlings to eggs: Is relative mass assignment an accurate method?

机译：将孵化场分配给鸡蛋：相对质量分配是一种准确的方法吗？

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BackgroundAccurately assigning hatchlings to the eggs from which they hatched is a prerequisite to understanding how the composition and environment of eggs affect the growth and survival of nestlings. Correctly assigning hatchlings to their eggs can be a challenging endeavor, however, because multiple eggs within the same clutch can hatch at essentially the same time. Egg and hatchling mass are highly correlated in most bird species, and thus assigning eggs to hatchlings using their relative mass (e.g., matching the heaviest hatchling to the heaviest candidate egg) could prove extremely useful. MethodsTo assess its potential utility, I applied relative mass assignment (RMA) retrospectively to a dataset of 133 Common Grackle ( Quiscalus quiscula ) nests in which all egg-hatchling dyads were determined unequivocally. ResultsI found that RMA correctly assigned approximately 90% of hatchlings to their eggs when 2?4 hatchlings were present between checks. The number of nests in which hatchlings could not be assigned to their egg, however, increased monotonically from 13 to 46 to 78% for nests containing 2, 3, and 4 hatchlings, respectively, due to the greater likelihood that the mass of hatchlings or their candidate eggs was identical. ConclusionsAlthough RMA correctly identified the vast majority of egg-hatchling dyads, researchers should use this method with caution, because it will always inflate positive egg-size effects and thus could potentially result in erroneously reporting significant effects.
机译：背景技术将孵化场正确地分配给孵化的卵是了解卵的组成和环境如何影响雏鸟生长和存活的先决条件。但是，将孵化场正确地分配给它们的卵可能是一项具有挑战性的工作，因为同一个离合器内的多个卵实际上可以同时孵化。鸡蛋和孵化质量在大多数鸟类中高度相关，因此，使用它们的相对质量（例如，将最重的孵化与最重的候选蛋匹配）将卵分配给孵化可能证明是非常有用的。方法为了评估其潜在效用，我将相对质量分配（RMA）回顾性地应用于133个常见Grackle（Quiscalus quiscula）巢的数据集中，其中明确地确定了所有孵卵的双胞胎。结果我发现，当两次检查之间出现2到4个孵化场时，RMA正确地将大约90％的孵化场分配给了它们的卵。但是，由于孵化量或孵化量较大的可能性较大，无法将孵化场分配给其卵的产蛋箱数量从13％增至46％到78％，分别包含2个，3个和4个孵化场的产蛋箱。他们的候选卵是相同的。结论尽管RMA正确地识别了绝大多数卵孵化的二元组，但研究人员应谨慎使用该方法，因为它总是会增加卵子大小的正效应，因此有可能导致错误报告显着效应。

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