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Effects of waterborne mercury at different temperatures on hematology and energy metabolism in grass carp ( Ctenopharyngodon idella )
International Journal of Environmental Science and Technology ( IF 3.1 ) Pub Date : 2020-09-01 , DOI: 10.1007/s13762-020-02906-7
Z.-H. Li , P. Li , Y. Wu

Aquatic ecosystem is greatly affected by metal pollution and global climate change. Mercury (Hg) is one of the most common metal pollutants that pose harmful effects to organisms. In this study, we evaluated the effects of water temperature and Hg2+ on hematological parameters, such as red blood cells (RBCs), hematocrit (Ht) and hemoglobin (Hb) and some indexes involved in energy metabolism, including hexokinase (HK), pyruvate kinase (PK), malate dehydrogenase (MDH), lactate dehydrogenase (LDH), glucose (GLU), electron transport system (ETS) and Na–K-ATPase in grass carp, Ctenopharyngodon idella. Fish (45.37 ± 3.58 g) were acclimated to 15, 20, 25, 30 or 35 °C and co-exposed to 0.000 or 0.039 mg/L Hg2+ for 4 weeks. Three-way ANOVA revealed that all variables were significantly affected by water temperature, Hg2+ concentration, exposure time and their interactions, except the RBCs value corresponding Hg*Time condition. Based on the significant changes of hematological parameters in Hg2+-free groups, the best health status in fish was approximately at 25 °C, appreciating physiological dysregulation in fish under too low (15 °C)/high (35 °C) temperature, especially at 35 °C. Although our data provide evidences that increased temperatures can potentiate Hg2+ toxicity, the combined effects of temperature and metals on aquatic organisms are complex and unpredictable, so we should not ignore the role of environmental factors (such as temperature) while evaluating the harmful effects of metals on aquatic ecosystem.



中文翻译:

不同温度下含水汞对草鱼血液学和能量代谢的影响。

水生生态系统受到金属污染和全球气候变化的极大影响。汞(Hg)是对生物造成有害影响的最常见的金属污染物之一。在这项研究中,我们评估了水温和Hg 2+对血液学参数的影响,例如红细胞(RBC),血细胞比容(Ht)和血红蛋白(Hb)以及涉及能量代谢的一些指标,包括己糖激酶(HK) ,草ten鱼中的丙酮酸激酶(PK),苹果酸脱氢酶(MDH),乳酸脱氢酶(LDH),葡萄糖(GLU),电子传输系统(ETS)和Na–K-ATPase 。将鱼(45.37±3.58 g)适应15、20、25、30或35°C的温度,并共同暴露于0.000或0.039 mg / L Hg 2+4周。三向方差分析显示,除RBCs值对应于Hg * Time条件外,所有变量均受水温,Hg 2+浓度,暴露时间及其相互作用的影响。基于无Hg 2+组的血液学参数的显着变化,鱼类的最佳健康状况约为25°C,这表明在太低(15°C)/太高(35°C)的温度下鱼的生理失调,尤其是在35°C下。尽管我们的数据提供了证据表明温度升高可以增强Hg 2+ 毒性,温度和金属对水生生物的综合影响是复杂且不可预测的,因此在评估金属对水生生态系统的有害影响时,我们不应忽略环境因素(例如温度)的作用。

更新日期:2020-09-01
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