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Intensive and extensive movements of feral camels in central Australia
Rangeland Journal ( IF 1.2 ) Pub Date : 2020-10-28 , DOI: 10.1071/rj19054
Cameron Ryan Wells , Mark Lethbridge

A better understanding of the movement of feral dromedary camels (Camelus dromedarius) in Australia would be useful for planning removal operations (harvest or culling), because the pattern and scale of camel movement relates to the period they reside in a given area, and thus the search effort, timing and frequency of removal operations. From our results, we suspect that the dune direction influences how camels move across central Australia; particularly effects like the north–south longitudinal dune systems in the Simpson Desert, which appeared to elongate camel movement in the same direction as the dunes. We called this movement anisotropy. Research suggests camel movement in Australia is not migratory but partially cyclic, with two distinctive movement patterns. Our study investigated this further by using satellite tracking data from 54 camels in central Australia, recorded between 2007 and 2016. The mean tracking period for each animal was 363.9 days (s.e.m. = 44.1 days). We used a method labelled multi-scale partitioning to test for changes in movement behaviour and partitioned more localised intensive movements within utilisation areas, from larger-scale movement, called ranging. This involved analysing the proximity of movement trajectories to other nearby trajectories of the same animal over time. We also used Dynamic Brownian Bridges Movement Models, which consider the relationship of consecutive locations to determine the areas of utilisation. The mean utilisation area and duration of a camel (n = 658 areas) was found to be 342.6 km2 (s.e.m. = 33.2 km2) over 23.5 days (s.e.m. = 1.6 days), and the mean ranging distance (n = 611 ranging paths) was a 45.1 km (s.e.m. = 2.0 km) path over 3.1 days (s.e.m. = 0.1 days).



中文翻译:

澳大利亚中部的野性骆驼密集运动

更好地了解野性单峰骆驼(Camelus dromedarius)在澳大利亚对计划搬迁行动(收获或扑杀)很有用,因为骆驼的活动方式和规模与它们居住在给定地区的时间有关,因此与搜查工作,迁徙行动的时间和频率有关。根据我们的结果,我们怀疑沙丘方向会影响骆驼在澳大利亚中部的移动方式。特别是像辛普森沙漠中的南北纵向沙丘系统之类的效果,它似乎使骆驼在与沙丘相同的方向上运动延长了。我们称这种运动为各向异性。研究表明,澳大利亚的骆驼运动不是迁移性的,而是部分周期性的,具有两种独特的运动方式。我们的研究通过使用2007年至2016年之间记录的澳大利亚中部54头骆驼的卫星跟踪数据进一步调查了这一情况。每只动物的平均追踪时间为363.9天(sem = 44.1天)。我们使用了一种称为多尺度分区的方法来测试运动行为的变化,并在利用区域内从较大范围的运动(称为测距)中划分出更多局部集中的密集运动。这涉及随着时间的推移分析同一动物的运动轨迹与其他附近轨迹的接近度。我们还使用了动态布朗桥运动模型,该模型考虑了连续位置之间的关系来确定利用区域。骆驼的平均利用面积和持续时间(来自大规模运动,称为测距。这涉及随着时间的推移分析同一动物的运动轨迹与其他附近轨迹的接近度。我们还使用了动态布朗桥运动模型,该模型考虑了连续位置之间的关系来确定利用区域。骆驼的平均利用面积和持续时间(来自大规模运动,称为测距。这涉及随着时间的推移分析同一动物的运动轨迹与其他附近轨迹的接近度。我们还使用了动态布朗桥运动模型,该模型考虑了连续位置之间的关系来确定利用区域。骆驼的平均利用面积和持续时间(n  = 658个区域)被发现在23.5天(sem = 1.6天)内为342.6 km 2(sem = 33.2 km 2),平均测距距离(n  = 611个测距路径)为45.1 km(sem = 2.0 km )超过3.1天的路径(sem = 0.1天)。

更新日期:2020-11-02
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