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<p>Deception Island, located in the South Shetland Islands, is one of Antarctica’s most ecologically sensitive and frequently visited areas, characterized by intense volcanic activity and extreme environmental conditions. Increasing human presence in the region poses potential risks to native microbial diversity, emphasizing the need to investigate anthropogenic impacts on polar ecosystems. This study reports the isolation and identification of <i>Lactococcus formosensis </i>from surface seawater at Deception Island. The isolate was characterized using morphological, mass spectrometric, biochemical, and serological methods, with species identity confirmed by 16S-23S rRNA internal transcribed spacer (ITS) sequencing. This molecular approach successfully differentiated <i>L. formosensis</i> from closely related species, including <i>Lactococcus garvieae</i> and <i>Lactococcus petauri</i>. Antibiotic susceptibility profiling revealed sensitivity to glycopeptides, beta-lactams, macrolides, sulfonamides, and fluoroquinolones. These findings provide essential baseline data for future research on antimicrobial resistance and microbial ecology in polar marine environments. The detection of <i>L. formosensis</i>, a species previously unreported in Antarctic waters, expands its known biogeographical range and adds to the growing evidence of non-native microorganisms in polar ecosystems. Importantly, <i>L. formosensis</i> possesses zoonotic potential, raising concerns regarding possible ecological and public health implications associated with microbial introductions in remote environments. These results highlight the urgent need for continuous microbiological monitoring in Antarctica, where the establishment of allochthonous microorganisms could disrupt native microbial communities and destabilize fragile aquatic ecosystems.</p>

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Isolation and identification of Lactococcus formosensis from Antarctic surface seawater

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Petya Orozova,
  • Ivan Ivanov,
  • Dimitar Ivanov,
  • Yordan Manasiev,
  • Eliza Uzunova

摘要

Deception Island, located in the South Shetland Islands, is one of Antarctica’s most ecologically sensitive and frequently visited areas, characterized by intense volcanic activity and extreme environmental conditions. Increasing human presence in the region poses potential risks to native microbial diversity, emphasizing the need to investigate anthropogenic impacts on polar ecosystems. This study reports the isolation and identification of Lactococcus formosensis from surface seawater at Deception Island. The isolate was characterized using morphological, mass spectrometric, biochemical, and serological methods, with species identity confirmed by 16S-23S rRNA internal transcribed spacer (ITS) sequencing. This molecular approach successfully differentiated L. formosensis from closely related species, including Lactococcus garvieae and Lactococcus petauri. Antibiotic susceptibility profiling revealed sensitivity to glycopeptides, beta-lactams, macrolides, sulfonamides, and fluoroquinolones. These findings provide essential baseline data for future research on antimicrobial resistance and microbial ecology in polar marine environments. The detection of L. formosensis, a species previously unreported in Antarctic waters, expands its known biogeographical range and adds to the growing evidence of non-native microorganisms in polar ecosystems. Importantly, L. formosensis possesses zoonotic potential, raising concerns regarding possible ecological and public health implications associated with microbial introductions in remote environments. These results highlight the urgent need for continuous microbiological monitoring in Antarctica, where the establishment of allochthonous microorganisms could disrupt native microbial communities and destabilize fragile aquatic ecosystems.