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Ienes-Lima, Julia; Prichula, Janira; Abadie, Michelle; Borges-Martins, Márcio; Frazzon, Ana Paula Guedes
Microbial ecology, 07/2023, Volume: 86, Issue: 1Journal Article
Melanophryniscus admirabilis is a small toad, critically endangered with a microendemic distribution in the Atlantic Forest in southern Brazil. The amphibian skin microbiome is considered one of the first lines of defense against pathogenic infections, such as Batrachochytrium dendrobatidis ( Bd ). The knowledge of skin amphibian microbiomes is important to numerous fields, including species conservation, detection, and quantification of environmental changes and stressors. In the present study, we investigated, for the first time, cultivable bacteria in the skin of wild M. admirabilis , and detected Bd fungus by nested polymerase chain reaction (PCR) technique. Skin swab samples were collected from 15 wild M. admirabilis , and the isolation of bacteria was performed by means of different culture strategies. A total of 62 bacterial isolates being Bacillus ( n = 22; 34.48 % ), Citrobacter ( n = 10; 16.13 % ) , and Serratia ( n = 12; 19.35 % ) were more frequently isolated genera. Interestingly, all skin samples tested were Bd negative. Some bacterial genera identified in our study might be acting in a synergic relationship and protecting them against the Bd fungus. In addition, these bacteria may play an essential role in maintaining this species in an environment modulated by anthropic actions. This first report of skin cultivable bacteria from M. admirabilis natural population improves our knowledge of skin amphibian microbiomes, contributing to a better understanding of their ecology and how this species has survived in an environment modulated by anthropic action.
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