Marine Field Station, Health Effects Research Laboratory-Cin., U.S. Environmental Protection Agency, 02892, West Kingston, Rhode Island.
Microb Ecol. 1980 Mar;6(1):45-54. doi: 10.1007/BF02020374.
The densities ofAeromonas hydrophila in various natural waters were found to be strongly correlated with a relative index proposed for use in trophic state assessments of fresh waters. No such correlation was found with the recoverable heterotrophic population of whichA. hydrophila is a part.A. hydrophila was found to be seasonally distributed with maximal densities occurring during summer through early fall. It was also found to be spatially distributed within a pond with the most consistent densities occurring from 1 m depth down to that depth in the water column where the temperature reaches 16°C. The densities of the organism correlated most strongly with total phosphorus, chlorophylla, and Secchi depth. Moderate correlations were found with dissolved phosphorus, Kjeldahl nitrogen, and dissolved organic carbon. Little or no correlation was obtained with ammonia, orthophosphate, pH, alkalinity, or dissolved oxygen. The discriminating ability that theA. hydrophila density measurements provide in the oligotrophic through mesotrophic range appears to exceed those of presently available methods. The facility and sensitivity of the enumeration method forA. hydrophila should make it a useful tool for trophic state assessments.
在各种天然水中，气单胞菌的密度与用于评估淡水营养状态的相对指数密切相关。然而，与气单胞菌可回收异养种群没有这种相关性，气单胞菌是该种群的一部分。气单胞菌呈季节性分布，密度最大的时期出现在夏季到初秋。它在池塘内也呈空间分布，在水层中温度达到 16°C 以下的 1 米深处到该深度处，密度最稳定。该生物的密度与总磷、叶绿素 a 和塞氏盘深度的相关性最强。与溶解磷、凯氏氮和溶解有机碳也有中等相关性。与氨、正磷酸盐、pH 值、碱度或溶解氧的相关性较小或没有。气单胞菌密度测量在贫营养到中营养范围内提供的区分能力似乎超过了目前可用方法的能力。气单胞菌计数方法的便利性和灵敏度使其成为营养状态评估的有用工具。
