M. Guichón, V. Benitez, A. Gozzi, S. Doyle, G. Cassini
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引用次数: 0
Abstract
Abstract Tree squirrel species that are successful invaders may modify their behaviour according to the characteristics of the invaded community. We studied the use of space by Callosciurus erythraeus in the main invasion focus established in Argentina, where suitable habitat is highly fragmented and immersed in a rural–urban landscape of the Pampas region. We evaluated habitat use in relation to the dominant arboreal vegetation (evergreen vs. deciduous) based on seasonal trapping data throughout two years and home range size and overlap based on seasonal radio-tracking data in two consecutive years. We captured 476 squirrels with a higher trapping success in areas dominated by evergreen vegetation. Effective home ranges were smaller for females (0.10–0.77 ha, n = 12) than for males (0.9–3.78 ha, n = 3). We observed home range overlap between and within both sexes, suggesting no or low territoriality. Our results support the two working hypotheses on the relatively higher use of areas dominated by evergreen vegetation and on the relatively small home range sizes and large overlapping areas associated to high squirrel density. The flexibility in the use of different type of arboreal patches would be another attribute linked to the invasion success of this species.
作为成功入侵物种的树松鼠会根据被入侵群落的特点改变其行为。我们研究了红胼胝体对阿根廷主要入侵焦点的空间利用,在那里,适合的栖息地是高度破碎的,沉浸在潘帕斯地区的城乡景观中。基于两年的季节性捕获数据和连续两年的季节性无线电跟踪数据,我们评估了栖息地利用与优势乔木植被(常绿与落叶)的关系。我们在常绿植被为主的地区捕获了476只松鼠,捕获成功率较高。雌性的有效范围(0.10-0.77 ha, n = 12)小于雄性(0.9-3.78 ha, n = 3)。我们观察到两性之间和两性之间的范围重叠,表明没有或低领土性。我们的研究结果支持了两种假设,即松鼠对常绿植被占主导地位的区域的利用相对较高,以及松鼠密度较高的相对较小的活动范围和较大的重叠区域。在使用不同类型的树木斑块方面的灵活性将是与该物种入侵成功相关的另一个属性。
期刊介绍:
Mammalia is an international, multidisciplinary, bimonthly journal devoted to the inventory, analysis and interpretation of mammalian diversity. It publishes original results on all aspects of the systematics and biology of mammals with a strong focus on ecology, including biodiversity analyses, distribution habitats, diet, predator-prey relationships, competition, community analyses and conservation of mammals. The journal also accepts submissions on sub-fossil or recently extinct mammals.