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首页> 外文期刊>Waterbirds >Sex Determination of Least Sandpiper (Calidris minutilla) and Western Sandpiper (Calidris mauri): Comparing Methodological Robustness of Two Morphometric Methods
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Sex Determination of Least Sandpiper (Calidris minutilla) and Western Sandpiper (Calidris mauri): Comparing Methodological Robustness of Two Morphometric Methods

机译：最小Sand（Calidris minutilla）和西部Sand（Calidris mauri）的性别确定：两种形态计量方法的方法学稳健性比较

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摘要

Least (Calidris minutilla, n = 110) and Western (Calidris mauri, n = 37) sandpipers collected in Cuban wetlands were sexed by gonadal examination on dissection and used to assess the robustness of two morphometric methods commonly used to assign sex in shorebirds. Discriminant function analyses were performed and then tested by jackknife validation. The best discriminant function for Least Sandpiper included culmen and wing lengths and correctly classified 91% of the birds. Using culmen length, the discriminant function correctly sexed 97% of the Western Sandpiper. Sex ratio and morphometric estimates obtained through sexing Least and Western sandpipers by discriminant functions were not significantly different from the population sexed by gonadal examination on dissection. The range of the bill lengths used for sex determination of Least and Western sandpipers were then assessed by fitting the known-sex data. Classification accuracy of the bill length method was high for Western Sandpiper (95%), but was imprecise (44%) and female biased for Least Sandpiper. Consequently, a female biased sex ratio and under-estimation of male culmen length occurred for Least, but not Western, sandpipers classified by the bill length method. The findings suggest that sex determination based on the single measurement of culmen length is only accurate for Western Sandpiper, a species with high sexual size dimorphism. Linear measurements are also important for sex assignment in Least Sandpiper, but only using a discriminant function analysis approach.
机译：对古巴湿地中采集的最小（Ca鱼（Calidris minutilla，n = 110））和西方（Ca鱼（Calidris mauri，n = 37））进行性腺解剖，并对它们进行性腺性别鉴定，以评估两种形态学方法的稳健性，这两种方法通常用于确定水鸟的性别。进行判别函数分析，然后通过折刀验证进行测试。最小矶pi的最佳判别功能包括孔和翅长，正确地划分了91％的鸟。使用标本长度，判别函数正确地确定了97％的Western Sandpiper的性别。通过判别函数对最小和西方sand进行性别区分而获得的性别比和形态计量估计与通过性腺检查进行性别区分的人群没有显着差异。然后通过拟合已知性别数据评估用于确定最小和西方Western的性别的账单长度范围。票据长度法的分类准确性在西方矶pi中较高（95％），但不准确（44％），女性对于最小矶pi有偏见。因此，按帐单长度法分类的最小（而不是西方）sand鱼发生了女性偏见的性别比和男性孔长度的低估。研究结果表明，仅根据单株长度的性别来确定性别就仅对Western Sandpiper（具有高性别大小二态性的物种）是准确的。线性测量对于“最小矶sex”中的性别分配也很重要，但只能使用判别函数分析方法。

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