The green alga, Cladophora, promotes Escherichia coli growth and contamination of recreational waters in Lake Michigan

Amy Vanden Heuvel, Colleen McDermott, Robert Pillsbury, Todd Sandrin, Julie Kinzelman, John Ferguson, Michael Sadowsky, Muruleedhara Byappanahalli, Richard Whitman, Gregory T. Kleinheinz

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

A linkage between Cladophora mats and exceedances of recreational water quality criteria has been suggested, but not directly studied. Th is study investigates the spatial and temporal association between Escherichia coli concentrations within and near Cladophora mats at two northwestern Lake Michigan beaches in Door County, Wisconsin. Escherichia coli concentrations in water underlying mats were significantly greater than surrounding water (p < 0.001). Below mat E. coli increased as the stranded mats persisted at the beach swash zone. Water adjacent to Cladophora mats had lower E. coli concentrations, but surpassed EPA swimming criteria the majority of sampling days. A signifi cant positive association was found between E. coli concentrations attached to Cladophora and in underlying water (p < 0.001). The attached E. coli likely acted as a reservoir for populating water underlying the mat. Fecal bacterial pathogens, however, could not be detected by microbiological culture methods either attached to mat biomass or in underlying water. Removal of Cladophora mats from beach areas may improve aesthetic and microbial water quality at affected beaches. These associations and potential natural growth of E. coli in bathing waters call into question the efficacy of using E. coli as a recreational water quality indicator of fecal contaminations.

Original languageEnglish (US)
Pages (from-to)333-344
Number of pages12
JournalJournal of Environmental Quality
Volume39
Issue number1
DOIs
StatePublished - Jan 1 2010

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