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首页> 外文期刊>Mammalian Biology >Vertical habitat segregation as a mechanism for coexistence in sympatric rodents
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Vertical habitat segregation as a mechanism for coexistence in sympatric rodents

机译：纵向栖息地隔离是同伴啮齿动物共存的机制

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Coexistence has been widely studied in small mammals and frequently is assumed to be facilitated by habitat segregation. Using live trapping and spool-and-line experiments, we analyzed habitat selection and segregation across multiples scales for Peromyscus leucopus and Ochrotomys nuttalli. At the habitat scale of a forest stand (similar to 1-100s ha) P. leucopus co-occurred at all sites where O. nuttalli was found, and we did not detect evidence of positive or negative associations or habitat segregation. However, O. nuttalli was restricted to early successional forests, and P. leucopus had significantly lower abundances in early successional forests than in other habitats. We found similar patterns at the mesohabitat scale of the study site (400 m(2)). O. nuttalli abundance increased with increasing shrub and tree densities, while increases in P. leucopus abundance were associated with open understories. At the microhabitat scale of the individual movement trail, we found vertical segregation. Movement trails for O. nuttalli were at significantly higher elevation (mean height = 142.93 +/- 37.10 cm) than P. leucopus trails (mean height = 15.4 +/- 4.98 cm; F-value = 35.29, p <0.001). We concluded that microhabitat segregation was driven by differential use of vertical space for movement and foraging. We suggest O. nuttalli is superior to P. leucopus in its ability to acquire food especially in shrubby subcanopies where few acorns are available. However, P. leucopus is superior in its ability to forage and avoid predators
机译：共存已经在小型哺乳动物中得到了广泛研究，并且通常被认为是由栖息地隔离促进的。使用活体诱捕和线轴和线下实验，我们分析了白斑病菌和螺壳菌的多种尺度的生境选择和隔离。在森林林地的栖息地范围内（大约1-100公顷），在发现坚果果的所有地点均同时发生白斑痤疮，而且我们没有发现正向或负向关联或栖息地隔离的证据。但是，nutalli O.只限于早期演替森林，而P. leucopus在早期演替森林中的丰度明显低于其他生境。我们在研究场所的中栖息地规模（400 m（2））上发现了类似的模式。灌木和乔木密度的增加会增加花生坚果的丰富度，而白果假单胞菌的丰富度则与开放的林下层有关。在个体运动轨迹的微生境尺度上，我们发现了垂直隔离。坚果果的运动轨迹的海拔高度（平均高度= 142.93 +/- 37.10 cm）明显高于白斑假单胞菌轨迹（平均高度= 15.4 +/- 4.98 cm; F值= 35.29，p <0.001）。我们得出的结论是，微生境的隔离是由垂直空间的不同利用引起的。我们建议坚果坚果在获取食物的能力方面要优于白头翁，特别是在橡子很少的灌木状亚冠中。但是，白斑假单胞菌在觅食和躲避捕食者方面具有优越的能力。

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