Prior to 2017 there was a lack of information regarding the abundance and density of raccoons (Procyon lotor) living in Yosemite Valley, Yosemite National Park, California. However, increased awareness of zoonotic disease raised concerns that human-raccoon interactions in Yosemite Valley could pose a risk of disease transmission. Additionally, biologists needed to know if raccoons would threaten the success of an endangered species reintroduction program for the California red-legged frog (Rana draytonii). Our project had several objectives: to obtain a population estimate of raccoons in the Yosemite Valley; to evaluate whether a zoonotic disease risk regarding Baylisascaris procyonis existed; to learn more about the extent of raccoon nuisance behavior; and to consider the risk raccoons may pose to the conservation of the California red-legged frog. We estimated a density of 1.89 (interquartile rate = 1.02–3.14) raccoons/km² and a population estimate of 40 individuals (SD ± 11.5), during Summer and Fall 2017. Three of 6 raccoons sampled showed evidence of B. procyonis infection, indicating a zoonotic risk for visitors to the park. There were 38 recorded incidents of raccoon nuisance behavior. Due to the low estimated raccoon density, we do not expect their presence to be a limiting factor for the California red-legged frog reintroduction program; however, we do suggest that future release sites be located away from known raccoon use areas. We encourage continued attention to wildlife-proof storage of food and garbage, visitor education regarding zoonotic disease risks, management actions aimed at ending anthropogenic feeding, and prompt clean-up of latrine sites found near eating or play areas. © 2021 The Wildlife Society.

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估计加利福尼亚州优胜美地山谷浣熊数量的空间标记研究模型

在 2017 年之前，缺乏关于生活在加利福尼亚州优胜美地国家公园优胜美地山谷的浣熊 ( Procyon lotor )的丰度和密度的信息。然而，人们对人畜共患病认识的提高引发了人们对优胜美地山谷中人与浣熊相互作用可能构成疾病传播风险的担忧。此外，生物学家需要知道浣熊是否会威胁到加利福尼亚红腿蛙 ( Rana draytonii )的濒危物种重新引入计划的成功。我们的项目有几个目标：获得优胜美地山谷浣熊的数量估计；评估是否存在与Baylisascaris procyonis 相关的人畜共患疾病风险存在; 了解更多关于浣熊滋扰行为的程度；并考虑浣熊可能对加利福尼亚红腿蛙的保护构成的风险。我们估计2017 年夏季和秋季期间的密度为 1.89（四分位间距 = 1.02–3.14）浣熊/km ²，种群估计数为 40 只 (SD ± 11.5)。采样的 6 只浣熊中有 3 只显示出B. procyonis 的证据感染，表明公园游客面临人畜共患病风险。有记录的浣熊滋扰行为事件有 38 起。由于估计浣熊密度较低，我们预计它们的存在不会成为加利福尼亚红腿蛙重新引入计划的限制因素；然而，我们确实建议未来的发布地点远离已知的浣熊使用区域。我们鼓励继续关注防止野生动物储存的食物和垃圾，开展关于人畜共患病风险的游客教育，旨在结束人为喂养的管理行动，以及及时清理饮食区或游乐区附近的厕所。© 2021 野生动物协会。