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裸鼻蝙蝠的数量和种群增长估计
Wiebke Knoblauch1, Scott Carver1, Michael M Driessen2
1Department of Biological Sciences University of Tasmania Hobart Tasmania Australia.
Ecology and evolution
|September 7, 2023
概括
聚焦调查提供了19年来弗林德斯岛和大陆塔斯马尼亚的裸鼻 (Vombatus ursinus) 种群估计. 两种亚种都显示出人口增加,在弗林德斯岛的密度更高.
科学领域:
- 野生动物生态学野生动物生态学
- 人口动态 人口动态
- 保护生物学 保护生物学
背景情况:
- 对于野生动物管理者来说,估计广泛分布的物种种群是具有挑战性的.
- 聚光灯调查提供了一种方法,可以在大型空间尺度上收集丰富度数据.
- 裸鼻 (Vombatus ursinus) 是一个地理上广泛分布的物种,适合于聚光灯调查.
研究的目的:
- 为两个裸鼻子子亚种提供第一个种群丰度估计:V. u. ursinus (弗林德斯岛) 和V. u. tasmaniensis (塔斯马尼亚大陆).
- 估计从2002年到2020年的两种亚种的年度变化率和种群大小.
- 在塔斯马尼亚大陆调查V. u. tasmaniensis的息地联系.
主要方法:
- 利用了19年的年度聚光灯调查数据 (2002-2020).
- 应用远距离采样方法来估计人口数量和变化速度.
- 将息地数据纳入塔斯马尼亚大陆亚种的分析.
主要成果:
- 与大陆塔斯马尼亚 (0.11/ha) 相比,在弗林德斯岛 (0.42/ha) 观察到更高的平均巴特密度.
- 两种亚种在调查期间均呈现出种群增长,年增长率为2.90% (弗林德斯岛) 和1.20% (塔斯马尼亚大陆).
- 估计2020年种群大小:弗林德斯岛上的71,826种V. u. ursinus和大陆塔斯马尼亚的840,665种V. u. tasmaniensis.
结论:
- 聚光灯调查对于估计广泛分布的物种种群,如裸鼻,是有效的.
- 人口估计为未来的状态评估提供了关键的基线,即使该亚种目前没有受到威胁.
- 可能需要进一步的研究来完善估计,考虑诸如wombat出现行为等因素.
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