Individual and temporal variation in habitat association of an alien carnivore at its invasion front

Gathering information on how invasive species utilize the habitat is important, in order to better aim actions to reduce their negative impact. We studied habitat use and selection of 55 GPS-marked raccoon dogs (30 males, 25 females) at their invasion front in Northern Sweden, with particular focus on differences between males and females, between movement states, and between seasons and times of the day. Daily movement pattern was used to classify GPS-locations into dispersing and settled. We focused on both anthropogenic and natural landscape characteristics. Since we did not have any a priori knowledge about the spatial scale of raccoon dog habitat selection, we first assessed how landscape characteristics of random points changed with distance from the GPS-location they were paired to. Because changes in habitat use became less pronounced at approximately 5 km for all variables, we focused on habitat use at two spatial scales: fine (500 m) and coarse (5 km). Habitat selection was st...探究入侵物种的栖息地利用模式，对于精准施策以降低其负面影响至关重要。本研究以瑞典北部入侵前沿的55只佩戴全球定位系统（GPS）项圈的貉（raccoon dog）为研究对象（其中雄性30只、雌性25只），探究其栖息地利用与选择模式，重点关注雌雄个体、不同运动状态以及季节与昼夜时段间的差异。我们基于每日运动模式将GPS定位点划分为扩散定位与定居定位两类。本研究同时涵盖人为景观与自然景观两类特征。由于我们对貉栖息地选择的空间尺度尚无先验认知，我们首先分析了随机采样点的景观特征随其与配对GPS定位点之间距离的变化规律。因所有变量的栖息地利用变化在约5公里处均趋于平缓，我们最终选取两个空间尺度开展栖息地利用分析：精细尺度（500米）与粗尺度（5公里）。栖息地选择则……