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摄像机陷显示,陆地捕食者在河流景观的冷水热水避难所中普遍存在
Christopher J Sullivan1, Chadwick D Rittenhouse1, Jason C Vokoun1
1Department of Natural Resources and the Environment, Wildlife and Fisheries Conservation Center University of Connecticut Storrs Connecticut USA.
Ecology and evolution
|July 19, 2023
概括
陆地捕食者经常访问水中热带避难所,对聚集的鱼类构成风险. 摄像机陷揭示了捕食者的日常存在,并在一天中增加了捕食的可能性.
科学领域:
- 生态生态学 生态生态学
- 野生动物生物学 野生动物生物学
- 保护科学 保护科学
背景情况:
- 陆地捕食者对水生生态系统有很大的影响,特别是聚集在热带避难所的鱼类.
- 河流景观的热带避难所是热带期间鱼类的关键冷水区域,但捕食者的存在可能会抵消它们的好处.
研究的目的:
- 评估陆地掠食者访问模式和河流热带避难所的掠食风险.
- 为了确定捕食者活动如何根据环境条件和一天中的时间变化.
- 量化利用这些避难所对利用这些避难所的鱼类的整体掠食压力.
主要方法:
- 在美国豪萨托尼克河 (Housatonic River) 的四个热带避难所使用摄像头陷进行被动监测.
- 对不同类型的陆地掠食者进行 diel 访问模式的分析.
- 统计建模以将游客率与河流排水和水温差异联系起来.
- 对所有捕食者类型的每小时掠食概率的估计.
主要成果:
- 每天在避难所检测到陆地捕食者,访问率各不相同.
- 捕食者访问率受到河流排水和水温差异的影响,因捕食者类型而异.
- 观察到22次对鱼的掠食尝试,在24小时内掠食概率显著增加.
结论:
- 摄像机陷提供了在河流热带避难所普遍存在的陆地捕食者活动的关键证据.
- 热带避难所的掠食风险是影响鱼类温度调节和生存的重要因素.
- 建议协调相机陷监测网络,以了解河流景观中的累积掠食者影响.
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