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首页> 外文期刊>Journal of ornithology >Yellow-eyed Penguin (Megadyptes antipodes) as a case study to assess the reliability of nest counts
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Yellow-eyed Penguin (Megadyptes antipodes) as a case study to assess the reliability of nest counts

机译：以黄眼企鹅（Megadyptes对虾）为例，评估巢计数的可靠性

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Population monitoring of seabirds plays an important role in conservation since it provides the information required to evaluate conservation programmes of endangered species, to guide harvest management and to monitor indicators of marine ecosystem health. Annual nest counts are often used for the long-term monitoring of breeding seabird populations. While such counts provide a direct and cost-effective survey method, single nest counts will almost always yield an underestimate of the true number of nests and provide no means of expressing uncertainty. In this study, we used double counts and the Lincoln-Petersen estimator to assess the reliability of nest counts for the Yellow-Eyed Penguin (Megadyptes antipodes) in the South Island of New Zealand. We estimated the detection rate of single nest counts at 88%, and we calculated that double counts are sufficiently precise to detect changes in the size of the breeding population as small as 3.3% between years. We failed to detect observer bias or any effects of search effort or habitat on the detection rate, the only significant factor being the steepness of the terrain. Given the high detection rate and the susceptibility of Yellow-Eyed Penguins to human disturbance, we conclude that the established protocol for single nest counts is adequate for the regular monitoring of the population. We suggest that double counts could be conducted once every 5 years to obtain precise estimates for the purpose of long-term population monitoring. We also highlight the importance of repeating similar studies for a variety of species and habitats.
机译：海鸟的种群监测在保护中起着重要作用，因为它提供了评估濒危物种的保护计划，指导收获管理和监测海洋生态系统健康指标所需的信息。年度巢穴计数通常用于长期监测繁殖的海鸟种群。尽管此类计数提供了一种直接且具有成本效益的调查方法，但单个巢计数几乎总是会低估巢的真实数量，并且无法表示不确定性。在这项研究中，我们使用了重复计数和林肯-彼得森（Lincoln-Petersen）估计量来评估新西兰南岛黄眼企鹅（Megadyptes对映体）巢计数的可靠性。我们估计单巢计数的检出率为88％，并且我们计算出双计数的精确度足以检测出每年之间小至3.3％的繁殖种群大小的变化。我们未能检测到观察者的偏见或搜索努力或栖息地对检测率的任何影响，唯一重要的因素是地形的陡度。鉴于高检出率和黄眼企鹅对人为干扰的敏感性，我们得出的结论是，已建立的单巢计数协议足以对种群进行常规监测。我们建议每5年进行一次重复计数，以获得长期人群监测的精确估计。我们还强调了对各种物种和栖息地重复类似研究的重要性。

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