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来自墨西哥的极端爱好鱼的热耐受性不受环境低氧的影响

Korbinian Pacher^1,2, Natalia Hernández-Román³, Alejandro Juarez-Lopez³

¹Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, 12487 Berlin, Germany.

|February 5, 2024

概括

两个临灭绝的墨西哥鱼种,硫和宽嘴布西亚,面临极端的高温和低氧,由于气候变化和息地威胁而生活在临界热极限附近.

科学领域:

生态生态学生态生态学
环境科学环境科学
生理学生理学生理学

背景情况:

气候变化影响了ectotherm热生态,特别是水生物种.
评估临界热极限 (CTmin,CTmax) 可以预测全球变暖对息地适宜性和生存的影响.
墨西哥硫泉中的临灭绝的极端鱼面临有毒的硫化,缺氧和高温.

研究的目的:

确定硫 (Poecilia sulphuraria) 和大嘴 (Gambusia eurystoma) 的热极限 (CTmin,CTmax).
在正常和缺氧条件下评估热耐受性.
评估一个独特的地热系统中的热安全边缘和息地适用性.

主要方法:

收集了来自墨西哥硫泉综合体的温度数据,跨越了各种地点和年份.
对两种物种进行了实验室热耐受性测试 (CTmin,CTmax).
应用热死亡时间 (TDT) 模型,将实验数据与自然息地温度联系起来.

主要成果:

在常态毒性条件下,CTmax在物种之间没有差异.
在低氧条件下,Poecilia sulphuraria的CTmax保持稳定;在低氧条件下,Gambusia eurystoma的CTmax显著下降.
这两种物种在干旱季节经历的温度接近或超过它们的临界热极限.

结论:

硫鱼表现出对极端条件的生理适应.
物种很容易受到当前和未来气候变化的影响,特别是缺氧.
对独特的硫泉生态系统造成的人为威胁迫切需要关注.

关键词:

这种鱼类是极度爱好鱼类.对温度的耐受性很高.热极限值是指热极限值.热耐受性热耐受性

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