五十年来大西洋鱼 (Salmo salar) 的身体长度变化在广泛的度梯度上表现出弱的空间同步
Tara L Imlay1, Cindy Breau1, Guillaume J R Dauphin1
1Fisheries and Oceans Canada Moncton New Brunswick Canada.
Ecology and evolution
|June 11, 2024
概括
大西洋鱼体型变化的空间同步在加拿大东部较弱. 海洋条件和渔业影响鱼的大小,但影响因河流而异,这表明人口减少的复杂驱动因素.
科学领域:
- 生态生态学 生态生态学
- 渔业 科学 渔业 科学
- 人口动态 人口动态
背景情况:
- 大西洋鱼 (Salmo salar) 种群在整个范围内的数量正在下降.
- 海洋环境的变化可能会影响鱼体型和生育能力,影响库存评估.
- 了解空间同步对于有效的人口管理和恢复至关重要.
研究的目的:
- 为了研究大西洋鱼的空间同步,在加拿大东部,大西洋鱼的身体大小在五十年内发生了变化.
- 为了将身体尺寸的变化与海洋环境因素和渔业开发联系起来.
- 评估共享的海洋条件对鱼种群的影响.
主要方法:
- 分析了50年来来自加拿大东部19条河流的172,268只野生大西洋成年鱼的数据集.
- 与海洋气候指数,热性息地,粮食可用性,密度依赖性和渔业开发相关的体型变化.
- 在不同河流系统中检查了身体尺寸趋势的空间同步.
主要成果:
- 在20世纪80年代和90年代,鱼在海上经过一 (1SW) 或两次 (2SW) 冬季后返回时,体型增加.
- 显著的身体尺寸变化表明空间同步性较弱,主要是在中度和北方河流,而不是南方河流.
- 对于1SW鱼来说,更大的尺寸与更低的开发相关;对于2SW鱼来说,更大的尺寸与更热息地和更高的大西洋多年周期振荡指数相关.
结论:
- 虚弱的空间同步表明大西洋鱼体型变化不仅仅是由共同的海洋条件驱动的.
- 环境因素的可变影响和跨河的开发表明了复杂的,局部的影响.
- 由于大小与生育关系,鱼体型的变化对种群管理和恢复有影响.
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