Effects of water scarcity and chemical pollution in aquatic ecosystems: State of the art

Water scarcity is an expanding climate and human related condition, which drives and interacts with other stressors in freshwater ecosystems such as chemical pollution. In this study we provide an overview of the existing knowledge regarding the chemical fate, biological dynamics and the ecological...

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Veröffentlicht in:The Science of the total environment 2016-12, Vol.572, p.390-403
Hauptverfasser: Arenas-Sánchez, Alba, Rico, Andreu, Vighi, Marco
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Rico, Andreu
Vighi, Marco
description Water scarcity is an expanding climate and human related condition, which drives and interacts with other stressors in freshwater ecosystems such as chemical pollution. In this study we provide an overview of the existing knowledge regarding the chemical fate, biological dynamics and the ecological risks of chemicals under water scarcity conditions. We evaluated a total of 15 studies dealing with the combined effects of chemicals and water scarcity under laboratory conditions and in the field. The results of these studies have been elaborated in order to evaluate additive, synergistic or antagonistic responses of the studied endpoints. As a general rule, it can be concluded that, in situations of water scarcity, the impacts of extreme water fluctuations are much more relevant than those of an additional chemical stressor. Nevertheless, the presence of chemical pollution may result in exacerbated ecological risks in some particular cases. We conclude that further investigations on this topic would take advantage on the focus on some specific issues. Experimental (laboratory and model ecosystem) studies should be performed on different biota groups and life stages (diapausing eggs, immature stages), with particular attention to those including traits relevant for the adaptation to water scarcity. More knowledge on species adaptations and recovery capacity is essential to predict community responses to multiple stressors and to assess the community vulnerability. Field studies should be performed at different scales, particularly in lotic systems, in order to integrate different functional dynamics of the river ecosystem. Combining field monitoring and experimental studies would be the best option to reach more conclusive, causal relationships on the effects of co-occurring stressors. Contribution of these studies to develop ecological models and scenarios is also suggested as an improvement for the prospective aquatic risk assessment of chemicals in (semi-)arid areas. [Display omitted] •Water scarcity and pollution increase are major problems affected by global change.•Interactive effects on biotic communities are rather unknown.•A literature review was done to get an overview of the present state of the art.•Interaction occurred, but hydrological variation was the main driver in most cases.•Water scarcity scenarios should be further studied and included in risk assessment.
doi_str_mv 10.1016/j.scitotenv.2016.07.211
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subjects Aquatic communities
Aquatic Organisms - drug effects
Biota - drug effects
Contaminants
Droughts
Ecotoxicology
Multiple stressors
Risk Assessment
Temporary rivers
Water Pollutants, Chemical - adverse effects
Water Pollution, Chemical - adverse effects
title Effects of water scarcity and chemical pollution in aquatic ecosystems: State of the art
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