Mangroves are complex and dynamic ecosystems that are highly dependent on diverse microbial activities. In this study, laboratory experiments and field studies for fecal indicator bacteria (FIB) decay rates are carried out for the first time in the Xuan Thuy Mangrove Forest Reserve of Vietnam. Results show that there are significant differences in bacterial diversity in the water of mangrove areas that have been deforested compared to those which have been planted. The highest mean total coliform (TC) and Escherichia coli (EC) values were found in the natural mangroves (3,807±2,922 and 964±1133 CFU 100 ml⁻¹, respectively). The results indicated that the source of contamination and seasonal changes affect the abundance of fecal bacteria. These results were exceeding by far the safety guidelines for individual, non-commercial water supplies in most of the samples. In the planted mangrove sampling sites, the highest mean Fecal streptococci (FS) values of 1,520±1,652 CFU 100 ml⁻¹ were found. Microbial die-off rates were calculated over 5 days, and observed to be systematically higher for TC than for EC.

红树林是复杂而动态的生态系统，高度依赖于多种微生物活动。在这项研究中，粪便指示菌 (FIB) 腐烂率的实验室实验和实地研究首次在越南的春水红树林保护区进行。结果表明，与已种植的红树林地区相比，已砍伐森林的红树林地区水中的细菌多样性存在显着差异。在天然红树林中发现最高的平均总大肠菌群 (TC) 和大肠杆菌(EC) 值（3,807±2,922 和 964±1133 CFU 100 ml ^-1， 分别）。结果表明，污染源和季节变化影响粪便细菌的丰度。在大多数样本中，这些结果远远超出了个人、非商业供水的安全准则。在种植的红树林采样点，发现最高平均粪便链球菌(FS) 值为 1,520±1,652 CFU 100 ml ^-1。在 5 天内计算了微生物死亡率，并观察到 ​​TC 的系统性高于 EC。