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Trans-generational and within-generational effects of two macrocyclic lactones on tunneller and dweller dung beetles (Coleoptera: Scarabaeidae): a case study

Published online by Cambridge University Press:  08 August 2018

I. Martínez M.*
Affiliation:
Red de Ecoetología, Instituto de Ecología A. C., El Haya, 91070 Xalapa, Veracruz, Mexico
N. Kadiri
Affiliation:
Univ Paul Valéry Montpellier 3, Univ Montpellier, EPHE, CNRS, IRD, CEFE UMR 5175, laboratoire de Zoogéographie, F34000, Montpellier, France
Y. Gil Pérez
Affiliation:
Red de Ecoetología, Instituto de Ecología A. C., El Haya, 91070 Xalapa, Veracruz, Mexico
J.P. Lumaret
Affiliation:
Univ Paul Valéry Montpellier 3, Univ Montpellier, EPHE, CNRS, IRD, CEFE UMR 5175, laboratoire de Zoogéographie, F34000, Montpellier, France
*
1Corresponding author (e-mail: [email protected]).

Abstract

Two distinct experiments were carried out to assess the trans-generational and within-generational effects of the parasiticides ivermectin and moxidectin to dung beetles (Coleoptera: Scarabaeidae). In the first experiment, the fertility of Euoniticellus intermedius (Reiche) (Scarabaeinae) was assessed for individuals developing in dung containing 10 µg ivermectin/kg fresh dung, a residue concentration previously shown to be sublethal to larval development. Our results showed that the fertility of adults exposed to these residues as larvae was unaffected. In the second experiment, the fertility of Agrilinus constans (Duftschmid) (Aphodiinae) was determined after females were allowed to feed for three weeks on dung containing different concentrations of moxidectin residues (five concentrations ranging from 0.32–32.00 mg/kg dry dung). The fertility of females was not affected, regardless of the concentration to which they were exposed, even when they were exposed to high moxidectin residues that killed all the offspring. The combined findings of these two experiments emphasise that sublethal effects should be included in models that assess the nontarget effects of faecal residues to insects breeding in dung of livestock treated with veterinary medicinal products.

Résumé

Deux expériences distinctes ont été menées pour évaluer les effets trans- générationnels et inter-générationnels de l’ivermectine et la moxidectine sur les bousiers (Coleoptera: Scarabaeidae), des molécules largement utilisées dans les traitements antiparasitaires du bétail. Dans la première expérience, la fertilité d’Euoniticellus intermedius (Reiche) (Scarabaeinae) a été évaluée chez des individus se développant dans des excréments contenant 10 μg d’ivermectine / kg de bouse fraîche, une concentration de résidus précédemment démontrée comme étant sublétale pour le développement larvaire. Nos résultats ont montré que la fertilité des adultes exposés précédemment à ces résidus en tant que larves n'était pas affectée. Dans la deuxième expérience, la fertilité d’Agrilinus constans (Duftschmid) (Aphodiinae) a été déterminée après que les femelles aient été nourries pendant trois semaines avec de la bouse contenant différentes concentrations de résidus de moxidectine (cinq concentrations variant de 0,32 à 32,00 mg/kg de bouse, poids sec). Cette exposition des femelles à la moxidectine n’a pas affecté significativement leur fécondité, quelle qu’ait été le niveau de leur exposition, même à des teneurs élevées qui ont pu tuer toute leur progéniture. Les résultats combinés de ces deux expériences soulignent que les effets sublétaux devraient être inclus dans les modèles qui évaluent les effets non ciblés des résidus fécaux sur les insectes qui se reproduisent dans les déjections des animaux traités avec des médicaments vétérinaires.

Type
Behaviour & Ecology
Copyright
© Entomological Society of Canada 2018 

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