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首页> 外文期刊>Mammalian Biology >Range expansion of Pallas's squirrel (Callosciurus erythraeus) introduced in southern France: Habitat suitability and space use
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Range expansion of Pallas's squirrel (Callosciurus erythraeus) introduced in southern France: Habitat suitability and space use

机译：在法国南部引进的帕拉斯松鼠（Callosciurus erythraeus）的射程扩大：生境适宜性和空间利用

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The study of space use and population density in different habitats is an important step in understanding the expansion process of an introduced species and in gathering useful knowledge for management actions. Pallas's squirrel (Callosciurus erythraeus) was introduced on the Cap d'Antibes (southeastern France) at the end of the 1960s. We used direct observations from a grid map centred onto the known historical distribution to document the expanding range of Pallas's squirrel. We assessed habitat suitability in the invaded area through distance sampling and nest counts and examined space use by quantifying the size of the home range and intra- and inter-sexual overlap based on radio-tracking in a suitable habitat. Our results confirm that Pallas's squirrel has expanded its range exponentially over the past two decades, although with low diffusion coefficients (0.08-0.20 km/yr). Squirrels reached the highest relative densities in suburban woodlands, in which females showed no territorial behaviour. Our results indicate that Pallas's squirrel was able to establish in various habitats in Antibes, preferentially in woodlands and gardens. Densely urbanised areas and the presence of the highway AS (E80) acted as barriers that slowed range expansion. Such information is crucial to improve the control programme started in 2012 to limit the spread of this potentially invasive squirrel. (C) 2015 Deutsche Gesellschaft fur Saugetierkunde. Published by Elsevier GmbH. All rights reserved.
机译：对不同生境的空间利用和种群密度的研究是了解引入物种的扩展过程和收集有关管理措施的有用知识的重要步骤。帕拉斯的松鼠（Callosciurus erythraeus）于1960年代末在安提布角（法国东南部）引入。我们使用了以已知历史分布为中心的网格图进行的直接观测，以记录帕拉斯松鼠的范围不断扩大。我们通过距离采样和巢计数来评估入侵区域的栖息地适宜性，并通过在合适的栖息地中进行无线电跟踪来量化家庭范围的大小以及性别内和性别之间的重叠，从而检查空间的使用。我们的结果证实，尽管扩散系数低（0.08-0.20 km / yr），但在过去的二十年中，Pallas的松鼠成倍地扩大了射程。松鼠在郊区林地达到了最高的相对密度，其中雌性没有表现出任何领土行为。我们的结果表明，帕拉斯的松鼠能够在昂蒂布的各种栖息地中定居，尤其是在林地和花园中。密集的城市化地区和高速公路AS（E80）的存在是阻碍范围扩展的障碍。这些信息对于改善2012年开始的控制计划以限制这种潜在侵入性松鼠的扩散至关重要。 （C）2015德国皮草拍卖行（Saugetierkunde）。由Elsevier GmbH发布。版权所有。

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