Universität zu Köln

Konschak, M., Zubrod, J. P., Baudy, P., Fink, P., Kenngott, K. G. J., Englert, D., Roeder, N., Ogbeide, C., Schulz, R. and Bundschuh, M. (2021). Chronic effects of the strobilurin fungicide azoxystrobin in the leaf shredder Gammarus fossarum (Crustacea; Amphipoda) via two effect pathways. Ecotox. Environ. Safe., 209. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1090-2414

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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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Konschak, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zubrod, J. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Baudy, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fink, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kenngott, K. G. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Englert, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roeder, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ogbeide, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schulz, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bundschuh, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-587635
DOI:	10.1016/j.ecoenv.2020.111848
Journal or Publication Title:	Ecotox. Environ. Safe.
Volume:	209
Date:	2021
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication:	SAN DIEGO
ISSN:	1090-2414
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FRESH-WATER AMPHIPODS; AMINO-ACID POOL; OXIDATIVE STRESS; PESTICIDE CONCENTRATIONS; LITTER DECOMPOSITION; ENVIRONMENTAL-STRESS; METABOLIC-RESPONSES; ENERGY RESERVES; STREAMS; BREAKDOWN Multiple languages Environmental Sciences; Toxicology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58763