Chowdhury M A, Yamanaka H, Miyoshi S, Shinoda S
Dept. of Environmental Hygiene, Faculty of Pharmaceutical Sciences, Okayama University, Japan.
Zentralbl Hyg Umweltmed. 1990 Oct;190(4):344-56.
The Ecology of mesophilic Aeromonas species has been investigated since January 1988 to examine their occurrence and distribution in aquatic environments of Okayama Prefecture. Water and plankton samples were quantitatively as well as qualitatively analyzed throughout the seasons from five selected stations including fresh, brackish, and saline environments. Analysis of variance and correlation coefficients among the biotic and abiotic parameters were sought. The organisms were found in all the environs with high densities through all the seasons. Plankton samples yielded higher counts of Aeromonas than the water samples in all the environs. Water temperature seemed to play a significant role on their growth during the winter months, however, no significant seasonal variation nor any correlation with fecal pollution were observed in most of the environments. A reciprocal relationship was seen with salt concentration in the saline environment. Among the currently recognized mesophilic species; A. caviae, A. hydrophila, A. sobria, and A. media were isolated with the predominance of anaerobic biovar. The present study reveals that Aeromonas are widely distributed in fresh, brackish and saline environments of this region. The study also reveals that Aeromonas are autochthonous members in aquatic ecosystems and are indigenous to these environs. Aeromonas species isolated from our environments were found to exhibit drug resistance potential which differed from that of isolates from diverse geographical locales. The high incidence of clinically significant Aeromonas species in this aquatic region could be of public health significance for the inhabitants of this region, as well as a challenge to their dependence on aquatic resources.
自1988年1月起，对嗜温气单胞菌属的生态学进行了研究，以考察它们在冈山县水生环境中的出现情况和分布。从包括淡水、咸淡水和咸水环境在内的五个选定站点，对水和浮游生物样本进行了全年的定量和定性分析。研究了生物和非生物参数之间的方差分析和相关系数。在所有环境中全年都发现了高密度的这类微生物。在所有环境中，浮游生物样本中的气单胞菌数量都高于水样。水温在冬季似乎对它们的生长起着重要作用，然而，在大多数环境中未观察到明显的季节变化，也未发现与粪便污染有任何相关性。在咸水环境中，发现与盐浓度呈反比关系。在目前公认的嗜温菌种中，分离出了豚鼠气单胞菌、嗜水气单胞菌、温和气单胞菌和中间气单胞菌，其中厌氧生物变种占优势。本研究表明，气单胞菌在该地区的淡水、咸淡水和咸水环境中广泛分布。该研究还表明，气单胞菌是水生生态系统中的土著成员，原产于这些环境。从我们环境中分离出的气单胞菌菌株表现出的耐药潜力与来自不同地理区域的菌株不同。在这个水生区域中具有临床意义的气单胞菌种类的高发生率，可能对该地区居民具有公共卫生意义，同时也对他们对水生资源的依赖构成挑战。
