非本地猎物的可用性和过度补偿密度的依赖性推动了本地鱼类捕食者的种群动态
Madaline M Cochrane1, Timothy J Cline1, Travis S Schmidt2
1Department of Ecology, Montana State University, Bozeman, Montana, USA.
概括
猎物的可用性,特别是非本土的kokanee,显著提高了牛鱼的生存率和丰度. 了解这些动态对于管理这个临灭绝的冷水物种及其渔业至关重要.
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:
- 牛鱼 (Salvelinus confluentus) 是一个临灭绝的冷水物种,由于息地丧失,过度捕捞,入侵物种和气候变化而面临衰退.
- 在多种压力因素下,猎物可用性对公牛鱼种群动态的作用尚不清楚,这阻碍了保护工作.
研究的目的:
- 量化非本地猎物 (kokanee),鱼,气候和密度依赖对公牛鱼种群动态的影响.
- 为危的牛鱼种群的保护和管理战略提供信息.
主要方法:
- 利用基于阶段的综合人口模型.
- 分析了40年 (1980-2023) 来自库卡努萨湖 (Koocanusa Lake) 的数据,这是一个跨境水库和河流系统.
- 科卡尼生物质,捕鱼压力,气候变化和密度依赖过程的量化影响.
主要成果:
- 牛鱼种群通过密度依赖的过程来调节,包括招募过度补偿和减少成年人生存率.
- 增加的kokanee生物量和限制的收获显著改善了牛鱼的生存率和丰度.
- 减少水的可用性对未成年人生产产生了有限的负面影响.
结论:
- 包括非本地物种在内的猎物可用性对于支持公牛鱼种群至关重要.
- 可以实现可持续的渔业,特别是高可卡尼生物量,每年可能维持300只的捕捞量.
- 有效的管理需要解决环境威胁,猎物动态和密度依赖之间的相互作用,跨越鱼的所有生命阶段.
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