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<p>Plate culture counting and strain isolation methods were utilized to assess the species richness and abundance of planktonic and attached bacteria on glass plates in the surface and bottom seawater of Qingdao Middle Harbor over a year, with monthly and quarterly sampling. Both species richness and bacterial numbers exhibited seasonal variations. Specifically, the abundance of attached bacteria and bacterioplankton peaked in June and July, corresponding to higher water temperatures in summer and autumn, while lower abundances were noted in January and December during cooler periods. Throughout the year, the species richness of attached bacteria consistently exceeded that of planktonic bacteria in both shallow and deep waters. <i>Pseudoalteromonas</i> emerged as the most prevalent genus among both planktonic and attached bacteria in surface and bottom seawater samples. Furthermore, the magnitude of changes in species richness and abundance for attached bacteria (0.66×10<sup>5</sup>–15.85×10<sup>5</sup> CFU/cm<sup>2</sup>) was greater than that observed for planktonic bacteria (0.58×10<sup>8</sup>–5.33×10<sup>8</sup> CFU/L). We propose that the attached bacterial populations, situated in limited microenvironments within the larger seawater ecosystem, exhibit heightened sensitivity to environmental fluctuations, resulting in more rapid shifts in population dynamics and lower ecological stability. The theoretical implications and potential applications of these findings warrant further investigation.</p>

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A preliminary study on the community structure of culturable planktonic and attached bacteria in the harbor of Qingdao, China

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Shide Ma,
  • Linlin Zhang,
  • Yimeng Zhang,
  • Yu Tai,
  • Wen Han,
  • Jinfeng Yang,
  • Xin Shi,
  • Bochao Lu,
  • Jizhou Duan

摘要

Plate culture counting and strain isolation methods were utilized to assess the species richness and abundance of planktonic and attached bacteria on glass plates in the surface and bottom seawater of Qingdao Middle Harbor over a year, with monthly and quarterly sampling. Both species richness and bacterial numbers exhibited seasonal variations. Specifically, the abundance of attached bacteria and bacterioplankton peaked in June and July, corresponding to higher water temperatures in summer and autumn, while lower abundances were noted in January and December during cooler periods. Throughout the year, the species richness of attached bacteria consistently exceeded that of planktonic bacteria in both shallow and deep waters. Pseudoalteromonas emerged as the most prevalent genus among both planktonic and attached bacteria in surface and bottom seawater samples. Furthermore, the magnitude of changes in species richness and abundance for attached bacteria (0.66×105–15.85×105 CFU/cm2) was greater than that observed for planktonic bacteria (0.58×108–5.33×108 CFU/L). We propose that the attached bacterial populations, situated in limited microenvironments within the larger seawater ecosystem, exhibit heightened sensitivity to environmental fluctuations, resulting in more rapid shifts in population dynamics and lower ecological stability. The theoretical implications and potential applications of these findings warrant further investigation.