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响应环境变化的较小鱼幼虫尺寸阶段与本体性过程和应激反应相关
Léa J Joly1,2,3, Maarten Boersma2,4, Carolina Giraldo1
1English Channel and North Sea Research Unit, Ifremer, 150 Quai Gambetta, 62200 Boulogne-sur-Mer, France.
Conservation physiology
|September 15, 2023
概括
全球变化影响鱼幼虫,加速发育,但在变暖和酸化下减小尺寸. 这种压力可能会通过改变生存率来影响鱼类种群的招募.
科学领域:
- 海洋生物学 海洋生物学
- 气候变化影响气候变化的影响.
- 鱼类生态 鱼类生态学
背景情况:
- 全球变化,包括海洋变暖和酸化,对海洋生态系统和海洋生物的生理构成重大威胁.
- 鱼幼虫特别容易受到环境变化的影响,其健康状况直接影响鱼类种群的招募和种群动态.
研究的目的:
- 研究预计的海洋变暖,酸化和改变食物质量的综合影响,对鱼幼虫的发育,生长和基因表达.
- 评估鱼幼虫对模拟的环境条件的生理应激反应,预测到2100年.
主要方法:
- 鱼幼虫在受控条件下养,模拟当前 (11°C,pH 8.0) 和未来 (14°C,pH 7.6) 的场景,有或没有缩食物来源.
- 在整个实验期间,对幼虫的长度和发育阶段进行了监测,持续时间长达化后60天.
- 基因表达分析侧重于第三阶段幼虫的生长,新陈代谢和应激反应途径.
主要成果:
- 变暖和酸化加快了幼虫的发育速度,导致在最后的发育阶段,幼虫的尺寸减少了-8%.
- 没有观察到对食品质量或治疗诱导的死亡率有重大影响.
- 基因表达分析表明,在暴露在更温暖和更酸性条件下的幼虫中,热冲击转录水平升高.
结论:
- 预测的海洋变暖和酸化为鱼幼虫创造了一个压力很大的环境,导致它们的尺寸变小.
- 这种尺寸缩小可能对招募产生双重影响:由于延长的脆弱时期,可能增加掠食风险,或者通过缩短幼虫寿命来提高生存率.
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