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首页> 外文期刊>Forest Ecology and Management >Habitat requirements of an arboreal Australian snake (Hoplocephalus bitorquatus) are influenced by hollow abundance in living trees
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Habitat requirements of an arboreal Australian snake (Hoplocephalus bitorquatus) are influenced by hollow abundance in living trees

机译：树栖澳大利亚蛇（Hoplocephalus Bitorquatus）的栖息地要求受到活着树木中空丰度的影响

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The value of tree hollows (cavities) to wildlife is well documented among birds and mammals, however few studies focus on their importance for snakes. Given increasing concern about the global net loss of hollow-bearing trees, it is imperative that studies extend to other vertebrate classes that may be dependent on this structural habitat component. We tested the hypothesis that habitat selection of an arboreal elapid, the pale-headed snake (Hoplocephalus bitorquatus), is primarily influenced by shelter requirements at multiple spatial scales. Consistent with our hypothesis, snake detection was biased towards a riparian ecosystem where hollow-bearing tree density was on average nine times greater than adjoining vegetation communities. In contrast, we found that the relative abundance of potential prey was equivalent among vegetation communities (frogs: P = 0.882; geckos: P = 0.306). At the microhabitat scale, snakes selected live hollow-bearing trees that were significantly larger (mean diameter: 74.5 cm +/- 3.4, s.e.) than those otherwise available (42.4 +/- 1.2 cm, s.e.) and estimated to be on average 111 years old. We recorded temperatures inside tree cavities to investigate whether the preference for live trees might be influenced by temperature buffering. Temperatures inside live trees were up to 16.4 degrees C below ambient in summer and 13.0 degrees C above ambient in winter. Temperature buffering was more pronounced in living trees (regression of cavity temperature against ambient, winter: r = -0.621; summer: r = -0.630) compared to dead trees (winter: r = -0.219; summer: r = -0.328), suggesting micro habitat selection may be driven by thermal requirements. Our study demonstrates the important role that mature, live hollow-bearing trees play in habitat selection by the pale-headed snake. It also suggests that the conservation of this species will be difficult in environments where such trees have been depleted due to land management practices. Managing forests for the persistence and recruitment of live hollow-bearing trees must be the primary conservation objective for threatened hollow-dependent fauna globally.
机译：树空洞（腔）对野生动物的价值在鸟类和哺乳动物中有很好的记录，但很少有研究侧重于他们对蛇的重要性。鉴于越来越多地关注轴承树木的全球净损失，必须延伸到其他可能依赖于该结构栖息地组分的脊椎动物类别。我们测试了栖息地选择栖息地选择的假设，苍头蛇（Hoplocephalus Bitorquatus）主要受到多个空间尺度的遮蔽要求的影响。与我们的假设一致，蛇检测偏向于沿着河流生态系统，其中轴承树密度平均比邻接植被社区大9倍。相比之下，我们发现潜在猎物的相对丰富是等同于植被社区（青蛙：P = 0.882; Geckos：P = 0.306）。在微藏尺度上，蛇选择的现场空心轴承树木明显较大（平均直径：74.5cm +/- 3.4，se）（42.4 +/- 1.2cm，se），并估计平均111岁。我们在树腔内记录了温度，以研究现场树木的偏好是否可能受到温度缓冲的影响。在夏季，在夏季，在环境中的温度低于环境温度高达16.4摄氏度，冬季高于环境温度。温度缓冲在活树上更加明显（腔温度消退，冬季，冬季：r = -0.621;夏季：r = -0.630）与死树（冬季：r = -0.219;夏天：r = -0.328），建议微栖所选择可以通过热量要求驱动。我们的研究表明，成熟的重要作用，现场空心树木在苍白蛇的栖息地选择栖息地。它还表明，在由于土地管理实践耗尽的环境中，这种物种的保护将困难。为现场空心树木的持久性和招聘管理森林必须是全球威胁空心依赖的动物的主要保护目标。

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