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Trap type can bias estimates of sex ratio

机译:陷阱类型可能会使性别比的估计产生偏差

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Sex ratio is a parameter of interest in many population studies. A key assumption of these studies is that the trapping method used does not bias the estimate of sex ratio in the sampled population. We use capture-recapture data of 2324 Serins (Serinus serinus) trapped in northeast Spain from 1985-1992 with Yunich platform traps and clap nets to test this assumption. Results show that in autumn the platform trap captured fewer females than expected by chance. This is probably due to dominant males monopolizing the small baited surface of the trap (trap: 0.36 vs. clap net: 3.24 m~2). The data additionally show a real increase in the proportion of males from autumn to winter, which may be related to differential mortality of the sexes.
机译:性别比是许多人口研究中关注的参数。这些研究的一个关键假设是,所使用的诱捕方法不会对抽样人群中性别比例的估计产生偏差。我们使用1985-1992年间在西班牙东北部被困的2324个Serins(Serinus serinus)的捕获-捕获数据与Yunich平台陷阱和拍手网来检验这一假设。结果显示,在秋季,平台陷阱捕获的女性数量少于偶然的预期。这可能是由于优势雄性垄断了诱集装置的小诱饵表面(诱捕装置:0.36 vs.拍手网:3.24 m〜2)。数据还显示,从秋季到冬季,男性比例真正增加,这可能与性别死亡率有关。

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