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Sublethal exposure to agrochemicals impairs zooplankton ability to face future global change challenges

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2023

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López-Valcárcel, María Eugenia
Parra, Gema

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Science of The Total Environment. Elsevier. 2023, 873, 162020. ISSN 0048-9697. eISSN 1879-1026. Available under: doi: 10.1016/j.scitotenv.2023.162020

Zusammenfassung

Intensive agriculture is characterized by the application of multiple stressors that damage aquatic systems. Currently, ecotoxicological evaluations are considered insufficient to understand the environmental risks of stressor mixtures and their consequences in ecosystems. In addition, future global change scenarios could alter the predicted effects of agrochemicals in aquatic systems based on single exposures, making it necessary to consider the history of environmental disturbances that may result in vulnerability to subsequent environmental changes. The objectives of this study were to induce disturbance histories by exposure to sublethal glyphosate concentrations in microcosms and to assess whether this disturbance results in vulnerable populations using Daphnia magna as the target species. Populations were considered vulnerable if their sensitivity to new stressors (inanition, temperature and salinity) was higher than that of undisturbed populations. To induce disturbance history, microcosm aquatic communities (two cladocerans and one microalgae) were exposed to two glyphosate sublethal concentrations (below the No Observed Effect Concentration, NOEC values for D. magna, 0.1 and 1 mg L−1) in microcosms under controlled conditions in a culture chamber for 48 days. After this period, no significant differences were observed with respect to the control microcosms in the selected parameters (cladoceran abundance, microalgae cell abundance, microalgae colony formation, pH and dissolved oxygen). To test vulnerability, our target D. magna populations, which were previously exposed to different glyphosate treatments, were subjected to inanition, elevated temperature and salinity. Our results showed that D. magna populations with disturbance history performed worse in all the scenarios compared to the populations from undisturbed conditions. These results underscore the need to study how environmental disturbance history influences population responses to new and future stressors. Moreover, our findings raise concern regarding the sublethal effects of pesticides on aquatic populations.

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570 Biowissenschaften, Biologie

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ISO 690LÓPEZ-VALCÁRCEL, María Eugenia, Ana DEL ARCO, Gema PARRA, 2023. Sublethal exposure to agrochemicals impairs zooplankton ability to face future global change challenges. In: Science of The Total Environment. Elsevier. 2023, 873, 162020. ISSN 0048-9697. eISSN 1879-1026. Available under: doi: 10.1016/j.scitotenv.2023.162020
BibTex
@article{LopezValcarcel2023Suble-66880,
  year={2023},
  doi={10.1016/j.scitotenv.2023.162020},
  title={Sublethal exposure to agrochemicals impairs zooplankton ability to face future global change challenges},
  volume={873},
  issn={0048-9697},
  journal={Science of The Total Environment},
  author={López-Valcárcel, María Eugenia and Del Arco, Ana and Parra, Gema},
  note={Article Number: 162020}
}
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