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Abstract：
Nutrias (Myocastor coypus) were imported to South Korea for farming in 1985; individuals escaped captivity and established wild populations in natural ecosystems in the late 1990s. Numerous studies have focused on their monitoring and management; however, information on the continuous movement of individuals is not available. In this study, telemetry data from field conditions were used to identify the nearest-neighbor distances of individuals in association with environmental factors, including plant type, land cover, and biological parameters. The minimum nearest-neighbor distances for the different sexes were, overall, according to the minimum distances for the same sex. Local co-occurrences of individuals, either of the same or different sex, were seasonal. Tall grasslands, followed by herbaceous vegetation, were associated with the co-occurrence of different sexes. Conversely, floating-leaved hydrophytes, followed by xeric herbaceous vegetation, were correlated with the co-occurrence of the same sex. Local female-male co-occurrences were negatively associated with male-male co-occurrences but not with female-female co-occurrences, suggesting male dominance in group formations. Movement and co-occurrence information extracted using Geo-self-organizing maps furthers our understanding of population dispersal and helps formulate management strategies for nutria populations.
摘要：
Nutrias（Myocastorcoypus）于1985年进口到韩国进行耕种；在1990年代后期，人们逃脱了囚禁，并在自然生态系统中建立了野生种群。许多研究都集中在他们的监测和管理;然而，关于个体连续运动的信息是不可用的。在这项研究中,来自野外条件的遥测数据用于识别与环境因素相关的个体的最近邻距离，包括植物类型，土地覆盖,和生物学参数。不同性别的最小最近邻距离是，总的来说,根据同性的最小距离。个人在当地的共同事件，相同或不同性别，是季节性的。高大的草原，其次是草本植物，与不同性别的共存有关。相反，浮叶水生植物，其次是干燥的草本植物，与同性的共同发生有关。当地的女性-男性共同事件与男性-男性共同事件呈负相关，但与女性-女性共同事件无关，表明男性在群体形成中占主导地位。使用地理自组织地图提取的运动和共现信息进一步加深了我们对种群扩散的理解，并有助于制定营养种群的管理策略。
