Effects of increased temperature, drought, and an insecticide on freshwater zooplankton communities

In the present study we performed a microcosm experiment to assess the effects of the insecticide lufenuron on zooplankton communities exposed to increased temperature and drought in (semi‐)arid regions. The experiment consisted of 3 environmental scenarios, assessed in 2 parts. Firstly, we assessed...

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Bibliographic Details
Published in:Environmental toxicology and chemistry 2019-02, Vol.38 (2), p.396-411
Main Authors: Arenas‐Sánchez, Alba, López‐Heras, Isabel, Nozal, Leonor, Vighi, Marco, Rico, Andreu
Format: Article
Language:English
Subjects:
Arid regions
Arid zones
Climate change
Communities
Cyclopoida
Desiccation
Drought
Environmental conditions
Exposure
High temperature
Insecticides
Microcosms
Multiple stressors
Organic chemistry
Pesticides
Population decline
Population‐level effects
Resilience
Sediments
Sensitivity analysis
Statistical analysis
Synergistic effect
Temperature effects
Water scarcity
Water temperature
Zooplankton
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Summary:In the present study we performed a microcosm experiment to assess the effects of the insecticide lufenuron on zooplankton communities exposed to increased temperature and drought in (semi‐)arid regions. The experiment consisted of 3 environmental scenarios, assessed in 2 parts. Firstly, we assessed how water temperature (20 and 28 °C) affects the sensitivity and resilience of the zooplankton community to lufenuron. Secondly, we investigated the influence of drought on the structure of the zooplankton community at a high water temperature (28 °C) and evaluated its possible interaction with lufenuron. The results show that the community exposed to lufenuron at 28 °C had a faster lufenuron‐related response and recovery than the community at 20 °C. The combined effects of lufenuron and temperature resulted in a synergistic effect on some taxa (Daphnia sp., Cyclopoida, and Copepoda nauplii). The tested zooplankton community had a high resilience to drought, although some particular taxa were severely affected after desiccation (Calanoida). Interactions between drought and lufenuron were not statistically significant. However, rewetting after desiccation contributed to lufenuron remobilization from sediments and resulted in a slight Cyclopoida population decline at high exposure concentrations. The study shows how environmental conditions related to global change in (semi‐)arid regions may influence chemical fate and the vulnerability of zooplankton communities to chemical stress. Environ Toxicol Chem 2019;38:396–411. © 2018 SETAC
ISSN:0730-7268
1552-8618
DOI:10.1002/etc.4304