Use of salinity mixing models to estimate the contribution of creek water fecal indicator bacteria to an estuarine environment: Newport Bay, California

被引:13
作者
McLaughlin, Karen [1 ]
Ahn, Jong Ho [1 ]
Litton, Rachel M. [1 ]
Grant, Stanley B. [1 ]
机构
[1] Univ Calif Irvine, Dept Chem Engn & Mat Sci, Irvine, CA 92697 USA
关键词
fecal indicator bacteria; mixing models; estuary; time series;
D O I
10.1016/j.watres.2007.05.005
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The contribution of freshwater discharge to fecal indicator bacteria (FIB) impairment of an estuarine environment can be approximated from simple, two end-member mixing models using salinity as a tracer. We conducted a yearlong time series investigation of Newport Bay, a regionally important estuarine embayment in southern California, assessing the concentrations of FIB, specifically Escherichia coli and enterococci bacteria, and salinity. In total, eight within-bay stations and one offshore control site were sampled nearly once per week and the three tributaries draining into Newport Bay were sampled approximately daily. Using salinity as a conservative tracer for water mass mixing and determining the end-member values of FIB in both the creek sites and the offshore site, we created a linear, two end-member mixing model of FIB within Newport Bay. Deviations from the mixing model suggest either an additional source of FIB to the bay (e.g. bird feces, storm drain discharge) or regrowth and/or die-off of FIB within the bay. Our results indicate that salinity mixing models can be useful in predicting changes in FIB concentrations in the estuarine environments and can help narrow the search for sources of FIB to the bay and enhance our understanding of the fate of FIB within the bay. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3595 / 3604
页数:10
相关论文
共 23 条
[21]   Sources of Escherichia coli in a coastal subtropical environment [J].
Solo-Gabriele, HM ;
Wolfert, MA ;
Desmarais, TR ;
Palmer, CJ .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 2000, 66 (01) :230-237
[22]   Evaluation of recreational health risk in coastal waters based on enterococcus densities and bathing patterns [J].
Turbow, DJ ;
Osgood, ND ;
Jiang, SC .
ENVIRONMENTAL HEALTH PERSPECTIVES, 2003, 111 (04) :598-603
[23]   Role of nonhost environments in the lifestyles of Salmonella and Escherichia coli [J].
Winfield, MD ;
Groisman, EA .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 2003, 69 (07) :3687-3694