File(s) not publicly available

A low dose of an organophosphate insecticide causes dysbiosis and sex-dependent responses in the intestinal microbiota of the Japanese quail (Coturnix japonica)

journal contribution
posted on 12.07.2018, 00:00 by E Crisol-Martínez, LT Moreno-Moyano, Ngare WilkinsonNgare Wilkinson, Tanka PrasaiTanka Prasai, Philip BrownPhilip Brown, RJ Moore, Dragana StanleyDragana Stanley
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. © 2016 Crisol-Martínez et al.

Funding

Other

History

Volume

2016

Issue

5

Start Page

1

End Page

23

Number of Pages

23

eISSN

2167-8359

Publisher

PeerJ, UK

Additional Rights

Creative Commons CC-BY 4.0

Peer Reviewed

Yes

Open Access

Yes

External Author Affiliations

University of Melbourne; RMIT University; University of New England

Author Research Institute

Institute for Future Farming Systems

Era Eligible

Yes

Journal

PeerJ

Usage metrics

Categories

Licence

Exports