现象学是否会在湖泊迁徙期间影响萨尔莫·特鲁塔·帕尔的掠食率?
Richard J Kennedy1, James Barry2, Adele Boyd3
1Agri-Food & Biosciences Institute, Bushmills, Northern Ireland.
Journal of fish biology
|March 16, 2024
概括
棕鱼 (Salmo trutta L.) parr在春季迁徙期间面临的掠夺性比秋季更高. 河流的流量较低,春季的清水增加了在到达湖泊之前掠食者的风险.
科学领域:
- 生态生态学 生态生态学
- 渔业 科学 渔业 科学
- 保护生物学 保护生物学
背景情况:
- 形棕鱼 (Salmo trutta L.) 从河流向湖泊进行重要下游迁徙.
- 了解迁徙期间的掠食动态对于有效的种群管理和保护策略至关重要.
- 迁徙鱼类的直接掠食率在自然河流系统中难以准确量化.
研究的目的:
- 为了比较春季与秋季下游迁徙期间棕鱼的直接掠食率.
- 确定影响不同迁徙季节掠食风险的环境因素.
- 根据标记季节,评估迁徙鱼的生存概率.
主要方法:
- 使用配备掠食传感器的声标签来监测捕食者的鱼类摄入量.
- 标签 38 个春季迁移 (2021-2022) 和 40 个秋季迁移 (2020-2021) 的棕鱼 parr.
- 比较标签触发事件 (表明掠食) 和季节间计算的每日损失率.
主要成果:
- 春季移民的掠食性 (34%) 比秋季移民 (7.5%) 高得多.
- 捕食者损失率为0.342%的春天的第一天和0.075%的秋天的第一天.
- 秋季的生存概率 (93%) 与春季 (66%) 相比较高,其中大部分春季掠食发生在河流中.
结论:
- 迁徙季节是影响棕鱼养场生存的重要因素,原因是捕食.
- 春季河流排水量较低和水质较清可能会增加掠食风险.
- 保护工作可能需要考虑河流条件和掠食压力的季节性变化.
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