期刊
ENVIRONMENTAL POLLUTION
卷 250, 期 -, 页码 669-675出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.04.067
关键词
Daphnia magna; Carrying capacity; Microplastics; Chronic toxicity; Population dynamics
资金
- NWO VIDI [864.13.010]
Even though microplastics are intensively studied, the focus of the research is mainly on relatively short term effects at high doses. Therefore there is a need to shift the focus toward more realistic, longer-term endpoints. Studies with a range of chemicals have shown that the response of populations often differs from studies in which a single organism is exposed in an individual container (as often described within standard ecotox screening assays). Here we investigate the impact of primary microplastics (1-5 mu m in size) on a population of Daphnia magna. We first allowed a stable population of D. magna to develop over 29 d, after which the populations were exposed to microplastics for three weeks (concentrations ranging from 10(2) to 10(5) particles mL(-1)and a control). We found a significant impact of microplastics on the total population of D. magna, with a reduction in the amount of adult daphnids. Importantly, when expressed as total biomass, exposure to 10(5) microplastics mL(-1) resulted in a 21% reduction in total biomass compared to control. These results indicate that exposure to microplastics can result in significant adverse effects on the population of D. magna, including a reduction in the number of individuals as well as total biomass. Given the importance of D. magna in freshwater food webs, both as a grazer as well as a food source, this can potentially impact the functioning of the ecosystem. Crown Copyright (C) 2019 Published by Elsevier Ltd. All rights reserved.
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