University of Miami, NSF NIEHS Oceans and Human Health Center, Miami, FL 33149, USA.
Mar Pollut Bull. 2011 Nov;62(11):2293-8. doi: 10.1016/j.marpolbul.2011.08.049. Epub 2011 Sep 25.
Enterococci are used to evaluate the safety of beach waters and studies have identified beach sands as a source of these bacteria. In order to study and quantify the release of microbes from beach sediments, flow column systems were built to evaluate flow of pore water out of beach sediments. Results show a peak in enterococci (average of 10% of the total microbes in core) released from the sand core within one pore water volume followed by a marked decline to below detection. These results indicate that few enterococci are easily removed and that factors other than simple pore water flow control the release of the majority of enterococci within beach sediments. A significantly larger quantity and release of enterococci were observed in cores collected after a significant rain event suggesting the influx of fresh water can alter the release pattern as compared to cores with no antecedent rainfall.
肠球菌被用于评估海滩水的安全性，研究已经确定海滩沙是这些细菌的来源。为了研究和量化微生物从海滩沉积物中的释放，建立了流动柱系统来评估从海滩沉积物中渗出的孔隙水的流动。结果表明，在一个孔隙水体积内，从沙芯中释放出的肠球菌（核心中总微生物的平均 10%）达到峰值，随后急剧下降到检测限以下。这些结果表明，很少有肠球菌很容易被去除，并且除了简单的孔隙水流控制之外，还有其他因素控制着海滩沉积物中大多数肠球菌的释放。在发生重大降雨事件后采集的岩芯中观察到大量的肠球菌，其释放量也明显增加，这表明与没有前期降雨的岩芯相比，淡水的涌入可以改变释放模式。
