Scholarlink

<p>Due to their biological characteristics, elasmobranchs are highly vulnerable to overfishing and habitat degradation. Environmental pollution has also been shown to increasingly affect elasmobranch microbiota composition, yet studies in this area remain scarce. This study aimed to provide a baseline assessment of enteric bacterial species detected in various shark and ray species from the Brazilian Amazon Coast. Enterobacteria samples were collected through cloacal smears from elasmobranchs, cultured, isolated, and biochemically identified (e.g., Vibrio, Aeromonas, Enterobacterales). Polymerase chain reaction (PCR) assays were conducted to identify <i>Aeromonas</i> spp. pathotypes. The most frequently detected enteric bacteria were <i>Klebsiella pneumoniae</i> (47%), <i>Pseudomonas aeruginosa</i> (38%), <i>Citrobacter freundii</i> (22%), and <i>Serratia</i> sp<i>.</i> (13%). Less commonly detected species included <i>Plesiomonas shigelloides</i>, <i>Vibrio gazogenes</i>, and <i>Yersinia pseudotuberculosis</i> (≤ 25%), categorized as rare among the assessed elasmobranchs. Notably, several bacterial species identified in this study (e.g., <i>Acinetobacter baumannii</i>, <i>Klebsiella ozaenae</i>, <i>Klebsiella rhinoscleromatis</i>, <i>Pseudomonas luteola</i>, <i>Salmonella choleraesuis</i>, <i>Vibrio gazogenes</i>, and <i>Yersinia pseudotuberculosis</i>) are reported for the first time in Brazilian elasmobranchs. Many of these bacteria are opportunistic pathogens to both animals and humans, posing potential risks of disease to colonized elasmobranchs and to humans who consume their meat. These findings underscore ecological and public health concerns within a One Health framework, highlighting the need for further research and monitoring.</p>

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An enteric microbiota assessment in sharks and rays from the Brazilian Amazon Coast

  • 期刊论文

  • 发表日期：

    2025年1月14日

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  • Ivana Correia Costa,
  • Salvatore Siciliano,
  • Rachel Ann Hauser-Davis,
  • Natascha Wosnick,
  • Getulio Rincon,
  • Emily Moraes Roges,
  • Marcia Lima Festivo,
  • Dalia dos Prazeres Rodrigues,
  • Jorge Luiz Silva Nunes

摘要

Due to their biological characteristics, elasmobranchs are highly vulnerable to overfishing and habitat degradation. Environmental pollution has also been shown to increasingly affect elasmobranch microbiota composition, yet studies in this area remain scarce. This study aimed to provide a baseline assessment of enteric bacterial species detected in various shark and ray species from the Brazilian Amazon Coast. Enterobacteria samples were collected through cloacal smears from elasmobranchs, cultured, isolated, and biochemically identified (e.g., Vibrio, Aeromonas, Enterobacterales). Polymerase chain reaction (PCR) assays were conducted to identify Aeromonas spp. pathotypes. The most frequently detected enteric bacteria were Klebsiella pneumoniae (47%), Pseudomonas aeruginosa (38%), Citrobacter freundii (22%), and Serratia sp. (13%). Less commonly detected species included Plesiomonas shigelloides, Vibrio gazogenes, and Yersinia pseudotuberculosis (≤ 25%), categorized as rare among the assessed elasmobranchs. Notably, several bacterial species identified in this study (e.g., Acinetobacter baumannii, Klebsiella ozaenae, Klebsiella rhinoscleromatis, Pseudomonas luteola, Salmonella choleraesuis, Vibrio gazogenes, and Yersinia pseudotuberculosis) are reported for the first time in Brazilian elasmobranchs. Many of these bacteria are opportunistic pathogens to both animals and humans, posing potential risks of disease to colonized elasmobranchs and to humans who consume their meat. These findings underscore ecological and public health concerns within a One Health framework, highlighting the need for further research and monitoring.