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达特 (Etheostoma spp.) 的特征对急性温度升高的跨种类的能量反应

Allison V Weber¹, Paul M Craig¹

¹Department of Biology, University of Waterloo, 200 University Ave West, Waterloo, ON N2L 3G1, Canada.

Conservation physiology

|April 16, 2025

概括

尾 (FTD) 显示较高的代谢酶活性和有氧范围,表明与彩虹 (RBD) 和约翰尼 (JD) 相比,更好地适应水温上升. 这表明FTD可能更适应气候变化影响.

科学领域:

环境生理学环境生理学
鱼类生态鱼类生态学
气候变化生物学

背景情况:

气候变化导致的水温上升对淡水鱼群构成重大威胁.
了解物种对热应激的特定代谢反应对于预测种群动态和告知保护策略至关重要.
在安大略省格兰德河 (Grand River) 的鱼种类面临越来越多的极端高温事件带来的潜在影响.

研究的目的:

描述三种鱼的热耐受性极限和代谢功能:鱼 (FTD),彩虹鱼 (RBD) 和约翰尼鱼 (JD).
在基线和热应激条件下分析大脑和心脏组织中细胞呼吸酶的活性.
为了确定每个物种在模拟热浪期间的有氧范围 (AS).

主要方法:

确定每个物种的临界热最大值 (CTmax).
在15°C和CTmax后分析大脑和心脏酶活性 (pyruvate kinase,酸盐合成酶,酸脱酶,乳酸脱酶,细胞染色体c氧化酶).
通过模拟的热模拟极端温度事件来测量有氧范围 (AS).

主要成果:

CTmax有显著的变化:FTD (33.3°C) >JD (31.8°C) >RBD (30.7°C). 这是一个非常明显的变化.
FTD表现出更高的基线脑酶活性;JD显示CTmax后酶活性增加,表明更大的热可塑性.
在高温 (10°C和15°C高于基线) 时,FTD表现出最高的有氧范围.

结论:

尾鱼 (FTD) 似乎最适合应对来自变暖水域的新陈代谢需求,因为它们具有优越的酶能力和有氧范围.
约翰尼·达特斯 (JD) 显示了对极端高温的代谢调整的潜力.
调查结果为预测更严重的人口变迁和在气候变化情景下指导保护工作提供了关键数据.

关键词:

有氧范围的有氧范围.Ct最大的酶活性气候变化气候变化气候变化热浪热浪热浪热浪代谢代谢代谢代谢小型鱼类缩写:FTD,花尾鱼;RBD,彩虹鱼;JD,约翰尼鱼;PK,酸盐激酶;LDH,乳酸脱酶;MDH,酸脱酶;CS,酸盐合成酶;COX,细胞染色体c氧化酶;AS,有氧范围;CTmax,临界热最大值;LOE,失去了平衡.

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