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鱼迁移现象学的变化促进了人口的稳定,但受到干旱的威胁

Henry K Baker¹, Mariska Obedzinski^1,2, Theodore E Grantham¹

¹Department of Environmental Science, Policy, and Management, University of California, Berkeley, California, USA.

Ecology letters

|February 24, 2025

概括

科霍鱼的迁徙时间变化显示出种群稳定性增加. 干旱减少了这种变化,可能会增加鱼种群的不稳定性.

科学领域:

生态生态学生态生态学
人口动态人口动态
动物行为动物行为

背景情况:

人口内运动的变化在自然界中很普遍.
这种变化的对人口动态的影响在很大程度上仍未被探索.
了解这些影响对于有效的保护战略至关重要.

研究的目的:

调查幼鱼 (Oncorhynchus kisutch) 迁移时间的双模式变化如何影响种群动态.
确定出生与非出生息地使用对个体成长,移民和成人回归的影响.
评估迁移变异对总体人口稳定性的贡献.

主要方法:

在加利福尼亚州的9个队伍中利用了3270个单独标记的科霍鱼的移动数据.
在"出生鱼" (晚期下移) 和"非出生鱼" (早期下移) 之间进行区分.
分析了两个群体之间的增长率,移民时间和成年人回归的丰富性和稳定性的差异.

主要成果:

与出生鱼相比,非出生鱼的生长变化更大,并较早地迁移到河口.
尽管不太常见,但非出生鱼在成年回报中占有不成比例的比例.
当包括出生和非出生鱼类时,总成年回报率是1.4倍更稳定的.

结论:

迁徙行为的人口内部变化显著提高了科霍鱼的种群稳定性.
在低水年间,非出生养殖减少,这表明干旱加剧了人口的不稳定性.
保护工作应考虑息地多样性和迁徙变化的作用,以保持鱼种群的弹性.

关键词:

在 Oncorhynchus 中.太平洋鱼是太平洋鱼的一种.气候变化气候变化气候变化多样性与稳定之间的关系.淡水鱼类的保护和保护种内特定变化的变化.生命史多样性多样性运动生态学运动生态学部分迁移是部分迁移.投资组合效应投资组合效应

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