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Population abundance, structure and movements of the European pond turtle, Emys orbicularis (Linnaeus 1758) based on capture-recapture data in a Venice Lagoon wetland area, Italy
Ethology Ecology & Evolution ( IF 1.2 ) Pub Date : 2021-02-16 , DOI: 10.1080/03949370.2020.1870567
Mirko Liuzzo 1 , Stefano Borella 2 , Dario Ottonello 3 , Vincenzo Arizza 4 , Stefano Malavasi 1
Affiliation  

A freshwater turtle monitoring programme along the inland margins of the Venice lagoon was initiated in 2019 in collaboration with the World Wild Fund for Nature (WWF-Italy). From a total of 336 European pond turtles (Emys orbicularis) captured and marked, 97 freshwater turtles were recaptured at least once (28.9% return rate) providing important information on population size, structure and movements of mature individuals within the study area. The population size was estimated with capture-recapture method (Capture-Mark-Recapture-CMR) at 1009.4 ± 365.2 pond turtles, with a mean density of 252.3 ± 91.3 ind./ha. The analysis of the movements showed that the average distance covered intra-water bodies was: 146.79 ± 117.08 m for females and 125.43 ± 112.34 m for males. A total of 17 E. orbicularis (eight females and nine males) out of 97 turtles changed the water body during the study period from April to early September. Only a female freshwater turtle migrated in all three study sites, being recaptured 1502.32 m from the tagging site. The percentage of captures was significantly higher in two canals than in the brackish lake habitat. Further research should address spatial distribution at a finer scale to evaluate the preferential habitat for threatened E. orbicularis populations in a transitional water system as the lagoon.



中文翻译:

基于意大利威尼斯泻湖湿地的捕获-再捕获数据,欧洲池塘龟的种群丰度、结构和运动,Emys orbicularis (Linnaeus 1758)

2019 年,与世界自然基金会(WWF-Italy)合作启动了一项沿威尼斯泻湖内陆边缘的淡水龟监测计划。从总共捕获和标记的 336 只欧洲池龟 ( Emys orbicularis ) 中,至少重新捕获了 97 只淡水龟一次(28.9% 的回收率),提供了关于研究区域内成熟个体的种群规模、结构和运动的重要信息。使用捕获-重新捕获方法 (Capture-Mark-Recapture-CMR) 估计种群规模为 1009.4 ± 365.2 只池塘龟,平均密度为 252.3 ± 91.3 个工业/公顷。运动分析表明,覆盖水体的平均距离为:女性为 146.79±117.08 m,男性为 125.43±112.34 m。共 17 个E.orbicularis97 只乌龟(8 只雌性和 9 只雄性)在研究期间从 4 月到 9 月初改变了水体。只有一只雌性淡水龟在所有三个研究地点迁徙,在距离标记地点 1502.32 m 处被重新捕获。两条运河的捕获百分比明显高于咸水湖栖息地。进一步的研究应该在更精细的尺度上解决空间分布问题,以评估作为泻湖的过渡水系统中受威胁的轮匝菌种群的优先栖息地。

更新日期:2021-02-16
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