Abstract

Hoary bats (Lasiurus cinereus) and silver-haired bats (Lasionycteris noctivagans) are species of conservation concern because of the documented annual mortality that occurs at wind energy facilities. Several recent studies have predicted continental-scale declines of hoary bat populations due to interactions with wind turbines. We predicted a decrease in captures at a summer site over 20 years where researchers have captured bats using generally consistent methods. We developed a hierarchical Bayesian model to estimate the relative change in the expected number of captures while controlling for time of year, temperature, and netting effort. We found no decrease in the number of captures for either species. We suggest that the lack of decrease observed at our study site may be a result of compensatory immigration, despite potential broader-scale population declines.

中文翻译：

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20年间候鸟数量的本地趋势

摘要

蝙蝠（Lasiurus cinereus）和银蝙蝠（Lasionycteris noctivagans）是有保护意义的物种，因为有文献记载在风能设施中发生的年死亡率。最近的一些研究预测，由于与风力涡轮机的相互作用，白蝙蝠种群的大陆规模下降。我们预测20年来夏季站点的捕捞量将减少，研究人员使用一般一致的方法捕获了蝙蝠。我们开发了一个分层贝叶斯模型，以估计预期捕获次数的相对变化，同时控制一年中的时间，温度和净工作量。我们发现这两种物种的捕获数量均未减少。我们建议，尽管潜在的大规模人口下降，但在我们的研究地点观察到的下降缺乏可能是代偿性移民的结果。