Spraint density of the Eurasian otter (Lutra lutra) is an accurate indicator of its population status in urban areas

IF 5.4 Q1 ENVIRONMENTAL SCIENCES Environmental and Sustainability Indicators Pub Date : 2024-09-17 DOI:10.1016/j.indic.2024.100479
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Abstract

The most traditional method used to monitor the distribution of otters is spraint density surveys, but there has been long-standing debate regarding whether this approach is sufficiently accurate. In response to this debate, the effectiveness and reliability of spraint density surveys as a method for assessing the otter distribution within urban areas were evaluated by comparing their results with those achieved using two alternative methods: genetic analysis and camera trap-based density based on the random encounter model. In addition, the spraint density was tested as an indicator of otter habitat preferences by modeling 19 environmental factors (seven associated with prey, nine with land use, and three with the river environment) using a pcount model. Spraint surveys, genetic analysis, and camera trapping were conducted at 36, 22, and 12 sites within Daegu Metropolitan City, respectively. A regression model indicated that the spraint density was strongly associated with the other two methods, while it was also found to accurately represent otter habitat preferences, with otters in urban areas preferring sites with a high density of large fish and river islets. Consequently, spraint density surveys were the most time-effective, cost-effective, and reliable method for investigating the otter distribution in this urban environment. As a result, population status assessment using spraint density surveys can provide important information for the conservation management of urban otters.
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欧亚水獭(Lutra lutra)的约束密度是衡量其在城市地区种群状况的准确指标
用于监测水獭分布的最传统方法是栓系密度调查,但关于这种方法是否足够准确的争论由来已久。为了回应这一争论,我们评估了作为评估城市地区水獭分布的一种方法的约束密度调查的有效性和可靠性,并将其结果与两种替代方法的结果进行了比较:遗传分析和基于随机相遇模型的相机捕获密度。此外,通过使用 pcount 模型对 19 个环境因素(7 个与猎物有关,9 个与土地利用有关,3 个与河流环境有关)进行建模,测试了作为水獭栖息地偏好指标的 spraint 密度。分别在大邱广域市内的 36 个、22 个和 12 个地点进行了水獭调查、遗传分析和相机诱捕。回归模型表明,spraint 密度与其他两种方法密切相关,同时还发现它能准确地代表水獭的栖息地偏好,即城市地区的水獭偏好大鱼密度高的地点和河流小岛。因此,在调查水獭在城市环境中的分布情况时,约束密度调查是最省时、最经济、最可靠的方法。因此,利用栓系密度调查进行种群状况评估可为城市水獭的保护管理提供重要信息。
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来源期刊
Environmental and Sustainability Indicators
Environmental and Sustainability Indicators Environmental Science-Environmental Science (miscellaneous)
CiteScore
7.80
自引率
2.30%
发文量
49
审稿时长
57 days
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