息地结构和引入的捕食者限制了临灭绝的地面鸟的丰富性
David G Parker1, Matthew Cameron1, Christopher E Gordon2,3,4
1Biodiversity, Conservation and Science, NSW Department Climate Change, Energy, the Environment and Water, Albury, New South Wales, Australia.
概括
保护临灭绝的平原流浪者需要管理草原的高度和控制引入的红狐. 对稀有物种的有效监测必须考虑零计数和非线性反应.
科学领域:
- 生态生态学 生态生态学
- 保护生物学 保护生物学
- 野生动物管理 野生动物管理
背景情况:
- 对危物种的有效保护策略依赖于了解限制因素.
- 监测稀有物种存在挑战,包括区分真假缺席和分析零主导数据集.
- 极度危的平原流浪者 (Pedionomus torquatus) 面临着由于息地修改和引入的掠食者 (如红狐 (Vulpes vulpes)) 而导致的种群减少.
研究的目的:
- 通过使用9年的聚光灯计数时间序列,调查植被结构和红狐存在对平原流浪者的占用和丰富性的影响.
- 通过确定平原流浪者人口动态的关键驱动因素,为保护战略提供信息.
主要方法:
- 利用距离采样来确定有效的条幅,以便在聚光灯调查期间检测平原流浪者.
- 采用障碍模型方法,将二项式通用添加模型与存在/缺席数据相匹配,并将负二项式模型与观察到平原流浪者的地点的丰度数据相匹配.
主要成果:
- 平原流浪者占用和丰富度表现出显著的时间波动.
- 在没有狐的情况下,平原流浪者占地与草高度 (最佳50150毫米) 呈现出凸关系,但在狐存在时,这种关系不存在.
- 平原流浪者很少在红狐存在的地区被检测到.
结论:
- 保护管理应专注于保持最佳的草原高度,并实施排除或抑制红狐群的战略.
- 罕见物种监测的统计分析必须考虑解决真假零,高零流行率和潜在非线性关系的方法,以有效地告知管理决策.
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