title: A low dose of an organophosphate insecticide causes dysbiosis and sex-dependent responses in the intestinal microbiota of the Japanese quail (Coturnix japonica).
abstract: Organophosphate insecticides have been directly or indirectly implicated in avian populations declining worldwide. Birds in agricultural environments are commonly exposed to these insecticides, mainly through ingestion of invertebrates after insecticide application. Despite insecticide exposure in birds occurring mostly by ingestion, the impact of organophosphates on the avian digestive system has been poorly researched. In this work we used the Japanese quail (Coturnix japonica) as an avian model to study short-term microbial community responses to a single dose of trichlorfon at low concentration in three sample origins of the gastrointestinal tract (GIT): caecum, large intestine and faeces. Using next-generation sequencing of 16S rRNA gene amplicons as bacterial markers, the study showed that ingestion of insecticide caused significant changes in the GIT microbiome. Specifically, microbiota composition and diversity differed between treated and untreated quail. Insecticide-associated responses in the caecum showed differences between sexes which did not occur with the other sample types. In caecal microbiota, only treated females showed significant shifts in a number of genera within the Lachnospiraceae and the Enterobacteriaceae families. The major responses in the large intestine were a significant reduction in the genus Lactobacillus and increases in abundance of a number of Proteobacteria genera. All microbial shifts in faeces occurred in phylotypes that were represented at low relative abundances. In general, changes in microbiota possibly resulted from contrasting responses towards the insecticide, either positive (e.g., biodegrading bacteria) or negative (e.g., insecticide-susceptible bacteria). This study demonstrates the significant impact that organophosphate insecticides have on the avian gut microbiota; showing that a single small dose of trichlorfon caused dysbiosis in the GIT of the Japanese quail. Further research is necessary to understand the implications on birds' health, especially in females.
authors.affiliation: School of Medical and Applied Sciences, Central Queensland University, Rockhampton, Queensland, Australia; Current affiliation: Central Queensland University, Melbourne, Victoria, Australia.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Crisol-Martínez
authors.affiliation: School of Biosciences, University of Melbourne , Parkville, Victoria , Australia.
authors.forename: Laura T
authors.initials: LT
authors.lastname: Moreno-Moyano
authors.affiliation: School of Medical and Applied Sciences, Central Queensland University, Rockhampton, Queensland, Australia; Institute for Future Farming Systems, Central Queensland University, Rockhampton, Queensland, Australia; Poultry Cooperative Research Centre, University of New England, Armidale, New South Wales, Australia.
authors.forename: Ngare
authors.initials: N
authors.lastname: Wilkinson
authors.affiliation: School of Medical and Applied Sciences, Central Queensland University, Rockhampton, Queensland, Australia; Institute for Future Farming Systems, Central Queensland University, Rockhampton, Queensland, Australia.
authors.forename: Tanka
authors.initials: T
authors.lastname: Prasai
authors.affiliation: School of Medical and Applied Sciences, Central Queensland University, Rockhampton, Queensland, Australia; Institute for Future Farming Systems, Central Queensland University, Rockhampton, Queensland, Australia.
authors.forename: Philip H
authors.initials: PH
authors.lastname: Brown
authors.affiliation: Poultry Cooperative Research Centre, University of New England, Armidale, New South Wales, Australia; School of Science, RMIT University, Bundoora, Victoria, Australia.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Moore
authors.affiliation: School of Medical and Applied Sciences, Central Queensland University, Rockhampton, Queensland, Australia; Institute for Future Farming Systems, Central Queensland University, Rockhampton, Queensland, Australia; Poultry Cooperative Research Centre, University of New England, Armidale, New South Wales, Australia.
authors.forename: Dragana
authors.initials: D
authors.lastname: Stanley
keywords: Dysbiosis; Insecticide; Intestinal; Japanese quail; Microbiota; Organophosphate