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渔业诱导的生命史变化在实验捕捞的鱼群中恢复

Stephan N van Dijk¹, Daniel E Sadler¹, Phillip C Watts¹

¹Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland.

Biology letters

|November 6, 2024

概括

过度捕捞导致鱼类生命史发生变化,比如体型变小. 然而,这些特征可以在足够的恢复期后逆转,表明人口的弹性.

科学领域:

生态生态学生态生态学
进化生物学进化生物学
渔业科学渔业科学

背景情况:

过度捕捞对全球鱼类种群构成重大威胁.
尺寸选择性采摘可以改变关键的生命历史特征,包括身体尺寸和生殖产量.
这些变化可能会影响人口的健康状况和长期生存.

研究的目的:

为了研究由大小选择性收获引起的生命史变化的可逆性.
评估捕捞停止后利用鱼群的恢复潜力.
为了比较不同选择压力下的跨实验线的特征恢复.

主要方法:

使用了实验鱼群,经过五代大小选择性采集 (大选择,小选择,随机选择).
在随后的10代恢复期 (收获停止) 期间监测生命史特征.
在康复后的选择线中比较成年人体型和生殖成功.

主要成果:

选择线之间的成年人体大小差异在恢复期后显著减少.
虽然一些身体尺寸变化持续存在,但它没有影响生殖成功.
由大小选择性收获引起的表型变化被发现是可逆的.

结论:

尺寸选择性捕捞会导致鱼群的可逆现象型变化.
恢复期是收获期的两倍,足以实现实质性的特征正常化.
足够的恢复时间可以恢复人口健康并减轻过度捕捞的负面影响.

关键词:

一个实验性的实验.渔业渔业渔业是一个渔业.这是一个代际代际的过程.生命史的特征生命史的特征根据大小进行选择性采摘.

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