Abstract
Chironomids are the most abundant aquatic insects in freshwater habitats that can survive in extreme conditions. In this study, as the microbiome provides extended genotype to the host to perform various functions, we explored the microbiota of the Chironomus circumdatus larvae to find out the putative role played by the symbiotic bacteria for the host. The metabarcoding analyses of the larvae revealed that the insect harbors 1771 phylotypes. Out of the various microbial communities found, the majority corresponded to the phyla Proteobacteria (52.59%) and Actinobacteria (20.56%), respectively. The midges also harbored Klebsiella (2.57%), Enterobacter (1.32%), Bacillus (2.29%), and Acinetobacter (2.13%) genera that are involved in detoxification of xenobiotics present in the water. The presence of radiation-resistant genera like Deinococcus, including bacterial species like radiodurans, a highly radiation-resistant bacterium, indicates its potential to support the host’s ability to sustain in adverse environments. The functional profiling of the bacteria showed the relative abundance of many enzyme groups, such as transferases (40.62%), oxidoreductases (23.49%), and hydrolases (3.77%). The results indicate that the larvae harbor a considerable variety of bacteria that help the host adapt and survive in the polluted waters. The present study provides thorough insights into the microbiome of the C. circumdatus larvae that can be exploited for the bioremediation of certain pollutants through biomimetic strategies. It also gives us a wake-up call to take a good look at the guts of these disease-carrying insects’ inabilities to spread deadly human diseases.
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Authors are also thankful to the Department of Zoology, Savitribai Phule Pune University for providing the infrastructure. Funding for the research work was supported by University Grant Commission (UGC)-Centre for Advanced Studies (Phase 3) (2019-2020) and Council of Scientific and Industrial Research (CSIR).This work is part of PhD thesis of Miss Chaitali Shaha.
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The research work was supported by the University Grant Commission (UGC) Centre for Advanced Studies (Phase 3) (2019–2020) and Council of Scientific and Industrial Research (CSIR). No financial help was provided for publishing this article.
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Shaha, C.M., Dar, M.A. & Pandit, R.S. Mining the diversity and functional profile of bacterial symbionts from the larvae of Chironomus circumdatus (bloodworms). Folia Microbiol 67, 861–872 (2022). https://doi.org/10.1007/s12223-022-00984-3
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DOI: https://doi.org/10.1007/s12223-022-00984-3