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| DOI | 10.1242/bio.060223 |
| Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia | |
| 发表日期 | 2024 |
| ISSN | 2046-6390 |
| 起始页码 | 13 |
| 结束页码 | 2 |
| 卷号 | 13期号:2 |
| 英文摘要 | The thermal ecology of ectotherm animals has gained considerable attention in the face of human-induced climate change. Particularly in aquatic species, the experimental assessment of critical thermal limits (CTmin and CTmax) may help to predict possible effects of global warming on habitat suitability and ultimately species survival. Here we present data on the thermal limits of two endemic and endangered extremophile fish species, inhabiting a geothermally heated and sulfur-rich spring system in southern Mexico: The sulfur molly (Poecilia sulphuraria) and the widemouth gambusia (Gambusia eurystoma). Besides physiological challenges induced by toxic hydrogen sulfide and related severe hypoxia during the day, water temperatures have been previously reported to exceed those of nearby clearwater streams. We now present temperature data for various locations and years in the sulfur spring complex and conducted laboratory thermal tolerance tests (CTmin and CTmax) both under normoxic and severe hypoxic conditions in both species. Average CTmax limits did not differ between species when dissolved oxygen was present. However, critical temperature (CTmax=43.2 degrees C) in P. sulphuraria did not change when tested under hypoxic conditions, while G. eurystoma on average had a lower CTmax when oxygen was absent. Based on this data we calculated both species'thermal safety margins and used a TDT (thermal death time) model framework to relate our experimental data to observed temperatures in the natural habitat. Our findings suggest that both species live near their thermal limits during the annual dry season and are locally already exposed to temperatures above their critical thermal limits. We discuss these findings in the light of possible physiological adaptions of the sulfur-adapted fish species and the anthropogenic threats for this unique system. |
| 英文关键词 | Extremophile fish; Temperature tolerance; Thermal limit; Thermal tolerance |
| 语种 | 英语 |
| WOS研究方向 | Life Sciences & Biomedicine - Other Topics |
| WOS类目 | Biology |
| WOS记录号 | WOS:001177038900009 |
| 来源期刊 | BIOLOGY OPEN
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/300296 |
| 作者单位 | Leibniz Institut fur Gewasserokologie und Binnenfischerei (IGB); Humboldt University of Berlin; Universidad Juarez Autonoma de Tabasco; Technical University of Berlin |
| 推荐引用方式 GB/T 7714 | . Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia[J],2024,13(2). |
| APA | (2024).Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia.BIOLOGY OPEN,13(2). |
| MLA | "Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia".BIOLOGY OPEN 13.2(2024). |
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