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Fitness consequences of the combined effects of veterinary and agricultural pesticides on a non-target insect


Mahdjoub, Hayat; Blanckenhorn, Wolf U; Lüpold, Stefan; Roy, Jeannine; Gourgoulianni, Natalia; Khelifa, Rassim (2020). Fitness consequences of the combined effects of veterinary and agricultural pesticides on a non-target insect. Chemosphere, 250:126271.

Abstract

Pesticides and veterinary products that are globally used in farming against pests and parasites are known to impact non-target beneficial organisms. While most studies have tested the lethal and sub-lethal effects of single chemicals, species are exposed to multiple contaminants that might interact and exacerbate the toxic responses of life-history fitness components. Here we experimentally tested an ecotoxicological scenario that is likely to be widespread in nature, with non-target dung communities being exposed both to cattle parasiticides during the larval stage and to agricultural insecticides during their adult life. We assessed the independent and combined consumptive effects of varying ivermectin and spinosad concentration on juvenile life-history and adult reproductive traits of the widespread yellow dung fly (Scathophaga stercoraria; Diptera: Scathophagidae). Larval exposure to ivermectin prolonged development time and reduced egg-to-adult survival, body size, and the magnitude of the male-biased sexual size dimorphism. The consumption by the predatory adult flies of spinosad-contaminated prey showed an additional, independent (from ivermectin) negative effect on female clutch size, and subsequent egg hatching success, but not on the body size and sexual size dimorphism of their surviving offspring. However, there were interactive synergistic effects of both contaminants on offspring emergence and body size. Our results document adverse effects of the combination of different chemicals on fitness components of a dung insect, highlighting transgenerational effects of adult exposure to contaminants for their offspring. These findings suggest that ecotoxicological tests should consider the combination of different contaminants for more accurate eco-assessments.

Abstract

Pesticides and veterinary products that are globally used in farming against pests and parasites are known to impact non-target beneficial organisms. While most studies have tested the lethal and sub-lethal effects of single chemicals, species are exposed to multiple contaminants that might interact and exacerbate the toxic responses of life-history fitness components. Here we experimentally tested an ecotoxicological scenario that is likely to be widespread in nature, with non-target dung communities being exposed both to cattle parasiticides during the larval stage and to agricultural insecticides during their adult life. We assessed the independent and combined consumptive effects of varying ivermectin and spinosad concentration on juvenile life-history and adult reproductive traits of the widespread yellow dung fly (Scathophaga stercoraria; Diptera: Scathophagidae). Larval exposure to ivermectin prolonged development time and reduced egg-to-adult survival, body size, and the magnitude of the male-biased sexual size dimorphism. The consumption by the predatory adult flies of spinosad-contaminated prey showed an additional, independent (from ivermectin) negative effect on female clutch size, and subsequent egg hatching success, but not on the body size and sexual size dimorphism of their surviving offspring. However, there were interactive synergistic effects of both contaminants on offspring emergence and body size. Our results document adverse effects of the combination of different chemicals on fitness components of a dung insect, highlighting transgenerational effects of adult exposure to contaminants for their offspring. These findings suggest that ecotoxicological tests should consider the combination of different contaminants for more accurate eco-assessments.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Scopus Subject Areas:Physical Sciences > Environmental Engineering
Physical Sciences > Environmental Chemistry
Physical Sciences > General Chemistry
Physical Sciences > Pollution
Physical Sciences > Health, Toxicology and Mutagenesis
Uncontrolled Keywords:General Chemistry, Environmental Chemistry, General Medicine
Language:English
Date:1 July 2020
Deposited On:22 Sep 2020 10:17
Last Modified:17 Dec 2020 12:50
Publisher:Elsevier
ISSN:0045-6535
OA Status:Green
Publisher DOI:https://doi.org/10.1016/j.chemosphere.2020.126271
Project Information:
  • : FunderSNSF
  • : Grant IDPP00P3_170669
  • : Project TitleGenetic variation in quality and sexual selection on condition-dependent traits
  • : FunderSNSF
  • : Grant IDP2ZHP2_175028
  • : Project TitleThe effects of global warming and urbanization on the distribution of dragonflies and damselflies
  • : FunderSNSF
  • : Grant ID31003A_176055
  • : Project TitleComparative evolutionary genomic analysis of widespread dung flies (Sepsidae; Scathophaga stercoraria): phenological differentiation and speciation
  • : FunderSNSF
  • : Grant IDPP00P3_170669
  • : Project TitleGenetic variation in quality and sexual selection on condition-dependent traits
  • : FunderSNSF
  • : Grant IDP2ZHP2_175028
  • : Project TitleThe effects of global warming and urbanization on the distribution of dragonflies and damselflies
  • : FunderSNSF
  • : Grant ID31003A_176055
  • : Project TitleComparative evolutionary genomic analysis of widespread dung flies (Sepsidae; Scathophaga stercoraria): phenological differentiation and speciation

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