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<p>Microbial communities are essential to the health and stability of coastal ecosystems. Despite their importance for ongoing coastal changes, little is known about the adaptive behaviors of seaweed-associated bacteria, particularly how they respond to abiotic stressors like salinity, antibiotics, and nutrient fluctuations. These bacteria are crucial for host fitness. This work was designed as an exploratory study, aiming to identify, characterize, and provide initial insights into how seaweed-associated bacteria respond to environmental stressors. Seaweed-associated bacteria from two East Kalimantan coastal zones (Selangan and Malahing) were isolated and characterized physicochemically, morphologically, and biochemically. The most chloramphenicol-sensitive strain was assessed for growth and biofilm formation under abiotic stress, and its identity confirmed by 16&#xa0;S rRNA sequencing and phylogenetic analysis. From the cultured community, one strain (designated strain 97) was selected for brief analysis due to its high sensitivity to chloramphenicol but resistance to other antibiotics. An increase in NH₄⁺-N (10&#xa0;mg-N/L) significantly reduced growth, while biofilm formation increased by 189.6% at moderate salinity (17 ppt). Under these conditions, the strain exhibited stronger biofilm-forming activity relative to its replication rate. Molecular analysis classified the strain 97 as <i>Bacillus</i> sp. Although limited to a single isolate, our result highlights microbial resilience mechanisms that potentially affect seaweed health. Future research should assess how stress-responsive bacteria influence the structure and function of seaweed-associated microbial communities, as well as their potential application for improving seaweed cultivation resilience in changing coastal environments.</p>

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Abiotic Stress Responses of a seaweed-associated Bacillus: Implications for Coastal Aquaculture Ecosystems

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Muhammad Naufal,
  • Siti Zunuraen,
  • Lulu Adilla Latifah,
  • Nurul Imani Septiana,
  • Yanti Inneke Nababan,
  • Wahyu Purbiantoro,
  • Ekowati Chasanah,
  • Fahrurrozi Fahrurrozi

摘要

Microbial communities are essential to the health and stability of coastal ecosystems. Despite their importance for ongoing coastal changes, little is known about the adaptive behaviors of seaweed-associated bacteria, particularly how they respond to abiotic stressors like salinity, antibiotics, and nutrient fluctuations. These bacteria are crucial for host fitness. This work was designed as an exploratory study, aiming to identify, characterize, and provide initial insights into how seaweed-associated bacteria respond to environmental stressors. Seaweed-associated bacteria from two East Kalimantan coastal zones (Selangan and Malahing) were isolated and characterized physicochemically, morphologically, and biochemically. The most chloramphenicol-sensitive strain was assessed for growth and biofilm formation under abiotic stress, and its identity confirmed by 16 S rRNA sequencing and phylogenetic analysis. From the cultured community, one strain (designated strain 97) was selected for brief analysis due to its high sensitivity to chloramphenicol but resistance to other antibiotics. An increase in NH₄⁺-N (10 mg-N/L) significantly reduced growth, while biofilm formation increased by 189.6% at moderate salinity (17 ppt). Under these conditions, the strain exhibited stronger biofilm-forming activity relative to its replication rate. Molecular analysis classified the strain 97 as Bacillus sp. Although limited to a single isolate, our result highlights microbial resilience mechanisms that potentially affect seaweed health. Future research should assess how stress-responsive bacteria influence the structure and function of seaweed-associated microbial communities, as well as their potential application for improving seaweed cultivation resilience in changing coastal environments.