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Diel activity patterns and overlap between Eurasian red squirrels and Siberian chipmunks in native and introduced ranges
Ethology Ecology & Evolution ( IF 1.2 ) Pub Date : 2020-06-24 , DOI: 10.1080/03949370.2020.1777211
Alley Andreoni 1 , Claudio Augugliaro 2 , Rudy Zozzoli 1 , Fabio Dartora 2 , Emiliano Mori 1
Affiliation  

Differential temporal behaviour promotes the coexistence of similar species, thus reducing interspecific competition. We investigated the overlap of activity patterns of invasive Siberian chipmunks Eutamias sibiricus and native Eurasian red squirrels Sciurus vulgaris in northeastern Italy; then, we compared our data with the activity of the same squirrel species in Mongolia, where both of them are native. Siberian chipmunks and Eurasian red squirrels resulted to be strictly diurnal species throughout their range. Both in the native and in the introduced range, the temporal activity of the Siberian chipmunk moderately overlapped with that of the larger Eurasian red squirrel, thus suggesting a limited temporal partitioning among these rodents. Levels of temporal overlap did not significantly differ between the native and the introduced range of the Siberian chipmunk. Our results provide further evidence that direct competitions may not occur between native Eurasian red squirrels and invasive Siberian chipmunks in Europe. This may be reflected by the different peaks of activity we found in spite of the general overlap in diel activity pattern, and/or by other unmeasured processes such as segregation in a spatial occurrence at the fine scale.

中文翻译:

欧亚红松鼠和西伯利亚花栗鼠在本土和引进范围内的 Diel 活动模式和重叠

差异时间行为促进了相似物种的共存,从而减少了种间竞争。我们调查了意大利东北部入侵的西伯利亚花栗鼠 Eutamias sibiricus 和本土欧亚红松鼠 Sciurus vulgaris 的活动模式的重叠;然后,我们将我们的数据与蒙古相同松鼠物种的活动进行了比较,它们都是本地的。西伯利亚花栗鼠和欧亚红松鼠在它们的整个分布范围内都是严格的昼夜物种。在本地和引入范围内,西伯利亚花栗鼠的时间活动与较大的欧亚红松鼠的时间活动适度重叠,因此表明这些啮齿动物之间的时间划分有限。西伯利亚花栗鼠的本地和引入范围之间的时间重叠水平没有显着差异。我们的结果提供了进一步的证据,表明本土的欧亚红松鼠和欧洲入侵的西伯利亚花栗鼠之间可能不会发生直接竞争。这可能反映在我们发现的不同活动峰值,尽管在日常活动模式中存在普遍重叠,和/或其他未测量的过程,例如在精细尺度的空间发生中的分离。
更新日期:2020-06-24
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