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Ecotoxicological assessment of suspended solids: the importance of biofilm and particle aggregation

Motiei, Asa and Ogonowski, Martin and Reichelt, Sophia and Gorokhova, Elena (2021). Ecotoxicological assessment of suspended solids: the importance of biofilm and particle aggregation. Environmental Pollution. 280 , 116888
[Research article]

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Abstract

Assessment of microplastic impacts in biota is challenging due to the complex behavior of the test particles and their interactions with other particulates, including microorganisms, in the environment. To disentangle responses to microplastic exposure from those to other suspended solids, both microplastic and natural particles must be present in the test system. We evaluated how microplastic, non-plastic particles, and biofilms interacted in their effects on survivorship using acute toxicity assay with Daphnia magna. The animals were exposed to microplastic and kaolin at different concentrations of suspended solids (SS; 10, 100, and 1000 mg/L) with a varying microplastic contribution (%MP; 0–80%) and biofilm (presence/absence) associated with the solids. Also, we examined how these exposure parameters (SS, %MP, and Biofilm) affected aggregate formation that was analyzed using particle size distribution data. Under the exposure conditions, Daphnia mortality was primarily driven by SS concentration but ameliorated by both microplastic and biofilm. The ameliorating effects were related to increased particle aggregation in the presence of biofilm and high %MP. In addition, a weak yet significant positive effect of the biofilm on the survivorship was observed, presumably, due to microbial food supply to the daphniids in the exposure system; the bacteria were utilized at the absence of other food. Therefore, the effects of both natural and anthropogenic particulates depend on the particle behavior and aggregation in the water governed by microbial communities and physicochemical properties of the particles, which must be taken into account in the hazard assessment of plastic litter.

Authors/Creators:Motiei, Asa and Ogonowski, Martin and Reichelt, Sophia and Gorokhova, Elena
Title:Ecotoxicological assessment of suspended solids: the importance of biofilm and particle aggregation
Series Name/Journal:Environmental Pollution
Year of publishing :2021
Volume:280
Article number:116888
ISSN:0269-7491
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Microbiology (Microbiology in the medical area to be 30109)
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:particle hazardous effects, biofilm, aggregation, microplastics, Daphnia magna
URN:NBN:urn:nbn:se:slu:epsilon-p-105165
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105165
Additional ID:
Type of IDID
DOI10.1016/j.envpol.2021.116888
Otherhttps://www-sciencedirect-com.ezp.sub.su.se/science/article/pii/S026974912100470X
ID Code:24336
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:01 Jun 2021 09:34
Metadata Last Modified:01 Jun 2021 09:41

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