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温带和热带淡水昆虫的热范围支持气候变化假设

Beatrice S Dewenter¹, Alisha A Shah², Jane Hughes³

¹Centre for Applied Water Science, Institute for Applied Ecology University of Canberra Canberra Australian Capital Territory Australia.

Ecology and evolution

|February 26, 2024

概括

温带生态热植物可以承受比热带物种更广泛的温度范围,因为每年温度变化更大. 这项研究支持淡水昆虫的气候变化假设,强调温度范围是关键因素.

科学领域:

生态生态学生态生态学
气候变化生物学气候变化生物学
生理生态生态学生理生态学

背景情况:

气候变化改变了时间尺度上的温度平均值和变化,影响了ectotherm的热承受能力.
气候变化假设 (CVH) 假设,温带地区每年温度变化较大,导致热带地区比热带地区更宽泛的热耐受性.
其他因素,如 diel 变异性,生物体大小和分类学也可能影响热耐受性.

研究的目的:

通过检查淡水昆虫的热状态和热极限来测试气候变性假设 (CVH).
调查年度温度范围,身体大小和分类认同对热宽度 (T) 的影响.
探索气候极端假设 (CEH) 与上热极限相关的支持.

主要方法:

测量了Ephemeroptera,Plecoptera和Trichoptera的热状态和临界热极限 (CT_max和CT_min).
在澳大利亚东部温带和热带河流中沿海拔梯度收集数据.
与环境和生物变量相关的热宽度 (T_br = CT_max - CT_min)

主要成果:

热宽度 (T_br) 随着每年温度范围的增加而增加,支持CVH.
温度也随着体型的增加而增加,而Plecoptera表现出比Ephemeroptera或Trichoptera更广泛的热宽度.
发现了对气候极端假设 (CEH) 关于上热极限的支持,但不是对限制热承受力的高年最高温度的支持.

结论:

温带淡水昆虫表现出比热带同类更广泛的耐热范围,与CVH一致.
年度温度变化是这些昆虫群体热宽度的重要预测因素.
需要进一步研究底气温度循环和最低温度对热承受力的影响.

关键词:

在CTmax中,CTmax为CTmax.时间 CTmin CTmin 在水中生长,水生生态ectotherms.气候变化气候变化气候变化气候变化假设气候变化假设温度变化的变化.热宽度热宽度热宽度热承受能力热承受能力

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