Combined effects of fungicides and temperature affect non-target aquatic fungal assemblages

IF 2 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Cristiane Biasi, Luiz Ubiratan Hepp
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Abstract

The extensive use of pesticides in agriculture can lead to water contamination and have adverse effects on different groups of aquatic organisms, including those that are not targeted. In this context, organisms involved in the decomposition of organic matter in terrestrial and aquatic ecosystems can be affected by these chemicals. In addition, in a climate change scenario, changes in temperature can potentiate this effect, as this variable is a modulator of biological processes. The aim of this study was to investigate the effects of acute and chronic exposure of a commercial fungicide on aquatic decomposing fungi (non-target) at different temperatures (18 °C and 22 °C). For this, two experiments were carried out: (1) acute, in which the fungi were exposed to the fungicide during the stimulation of sporulation (48 h) at both temperatures, and (2) chronic, in which the fungi were exposed to the fungicide during the period of substrate colonization (25 days) at both temperatures. The effective concentration to inhibit 50% (EC50) of sporulation rates at 22 °C was lower than at 18 °C. For both situations, fungal activity was inhibited with increasing fungicide concentrations. It was also verified that the temperature had an important role in the fungal response to stressors, since an increase in temperature potentiated the fungicide effect in the acute and chronic experiments. The results show that excessive use of fungicides, associated with an increase in temperature, can cause changes in the fungal community and their ability to reproduce.

Abstract Image

杀菌剂和温度的联合作用影响非目标水生真菌组合
在农业中广泛使用农药可导致水污染,并对不同种类的水生生物产生不利影响,包括那些未被列为目标的水生生物。在这方面,陆地和水生生态系统中参与有机物分解的生物可能受到这些化学物质的影响。此外,在气候变化的情况下,温度的变化可以增强这种效应,因为这一变量是生物过程的调节剂。本研究的目的是研究在不同温度(18°C和22°C)下,急性和慢性暴露于一种商业杀菌剂对水生分解真菌(非目标)的影响。为此,进行了两项实验:(1)急性实验,在两种温度下,真菌在刺激产孢过程中暴露于杀菌剂(48 h);(2)慢性实验,在两种温度下,真菌在底物定植期间暴露于杀菌剂(25天)。22℃条件下抑制50%产孢率的有效浓度(EC50)低于18℃条件下。在这两种情况下,真菌活性都随着杀菌剂浓度的增加而受到抑制。研究还证实,温度在真菌对应激源的反应中起重要作用,因为温度的升高增强了急性和慢性实验中的杀真菌效果。结果表明,过量使用杀菌剂,加上温度升高,会导致真菌群落及其繁殖能力的变化。
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来源期刊
Aquatic Sciences
Aquatic Sciences 环境科学-海洋与淡水生物学
CiteScore
3.90
自引率
4.20%
发文量
60
审稿时长
1 months
期刊介绍: Aquatic Sciences – Research Across Boundaries publishes original research, overviews, and reviews dealing with aquatic systems (both freshwater and marine systems) and their boundaries, including the impact of human activities on these systems. The coverage ranges from molecular-level mechanistic studies to investigations at the whole ecosystem scale. Aquatic Sciences publishes articles presenting research across disciplinary and environmental boundaries, including studies examining interactions among geological, microbial, biological, chemical, physical, hydrological, and societal processes, as well as studies assessing land-water, air-water, benthic-pelagic, river-ocean, lentic-lotic, and groundwater-surface water interactions.
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