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Chronic effects of the strobilurin fungicide azoxystrobin in the leaf shredder Gammarus fossarum (Crustacea; Amphipoda) via two effect pathways

Konschak, M. and Zubrod, J. P. and Baudy, P. and Kenngott, K. G. J. and Englert, D. and Roeder, N. and Ogbeide, C. and Schulz, R. and Bundschuh, Mirco (2021). Chronic effects of the strobilurin fungicide azoxystrobin in the leaf shredder Gammarus fossarum (Crustacea; Amphipoda) via two effect pathways. Ecotoxicology and Environmental Safety. 209 , 111848
[Research article]

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Abstract

Fungicides pose a risk for crustacean leaf shredders serving as key-stone species for leaf litter breakdown in detritus-based stream ecosystems. However, little is known about the impact of strobilurin fungicides on shredders, even though they are presumed to be the most hazardous fungicide class for aquafauna. Therefore, we assessed the impact of the strobilurin azoxystrobin (AZO) on the survival, energy processing (leaf consumption and feces production), somatic growth (growth rate and molting activity), and energy reserves (neutral lipid fatty and amino acids) of the amphipod crustacean Gammarus fossarum via waterborne exposure and food quality mediated (through the impact of leaf colonizing aquatic microorganisms) and thus indirect effects using 2 x 2-factorial experiments over 24 days. In a first bioassay with 30 mu g AZO/L, waterborne exposure substantially reduced survival, energy processing and affected molting activity of gammarids, while no effects were observed via the dietary pathway. Furthermore, a negative growth rate (indicating a body mass loss in gammarids) was induced by waterborne exposure, which cannot be explained by a loss in neutral lipid fatty and amino acids. These energy reserves were increased indicating a disruption of the energy metabolism in G. fossarum caused by AZO. Contrary to the first bioassay, no waterborne AZO effects were observed during a second experiment with 15 mu g AZO/L. However, an altered energy processing was determined in gammarids fed with leaves microbially colonized in the presence of AZO, which was probably caused by fungicide-induced effects on the microbial decomposition efficiency ultimately resulting in a lower food quality. The results of the present study show that diet-related strobilurin effects can occur at concentrations below those inducing waterborne toxicity. However, the latter seems to be more relevant at higher fungicide concentrations.

Authors/Creators:Konschak, M. and Zubrod, J. P. and Baudy, P. and Kenngott, K. G. J. and Englert, D. and Roeder, N. and Ogbeide, C. and Schulz, R. and Bundschuh, Mirco
Title:Chronic effects of the strobilurin fungicide azoxystrobin in the leaf shredder Gammarus fossarum (Crustacea; Amphipoda) via two effect pathways
Series Name/Journal:Ecotoxicology and Environmental Safety
Year of publishing :2021
Volume:209
Article number:111848
Number of Pages:9
Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE
ISSN:0147-6513
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:Amino acids, Fatty acids, Food quality, Leaf litter breakdown, Metabolic disruptor, Microbial decomposers
URN:NBN:urn:nbn:se:slu:epsilon-p-111128
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111128
Additional ID:
Type of IDID
DOI10.1016/j.ecoenv.2020.111848
Web of Science (WoS)000611821600006
ID Code:22819
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:22 Mar 2021 10:03
Metadata Last Modified:22 Mar 2021 10:11

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