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Identify sources of high E. coli concentrations, beaches of southern Lake Michigan, 2015, (version 2.0, July 2020)

August 3, 2020

Data were collected as part of a study to identify sources of E. coli contamination at several beaches located in the Grand Calumet River Areas of Concern, located in northern Indiana on Lake Michigan. Water samples were collected at each site (Jeorse Park 1, Jeorse Park 2, Hammond East, Hammond West, Whihala East, and the Grand Calumet River) three times a week for thirteen weeks and analyzed for E. coli bacteria (an indicator bacteria for fecal contamination) and species-specific molecular markers (microbial source tracking, MST), including human (HF183, Mnif), gull (Gull2), and dog (DogBact). Presence of MST markers indicates a fecal source at that location associated with the target animal. Field conditions were recorded during each site visit (e.g., including air and water temp, wind speed and direction, rainfall, wave height, currents, observations). Water samples were analyzed in the laboratory for E. coli using defined substrate technology and for MST markers using quantitative polymerase chain reaction (qPCR) methods and also turbidity. Lat_long file includes information regarding sampling locations and their corresponding latitude and longitudes. The E coli_turbidity data include E. coli densities and turbidity measurements. Data from the qpcr_v3 file includes results from quantitative polymerase chain reaction (qPCR) method for detection of host-specific microbial source tracking markers as follows: Gulls (Gull2), Dogs (DogBact), and human (HF183, Mnif). Data from SanitarySurvey includes ambient conditions measured in the field: water and air temperature (H-B instrument, Trappe, PA), current speed and direction (eastward, westward, float method), wind direction and speed (SKYTECH, Weatherhawk, Logan, Utah), wave height (meter stick), rainfall (less than 24 hr, less than 48, less than 72, and greater than 72 prior to sample collection), and cloud cover (scale). Data from SanitarySurvey_birds included number of birds (gulls, geese, ducks, cormorants, etc.) counted on the beach and in the water. The Powerwater DNA Isolation.pdf is the DNA extraction kits' user manual giving detailed instructions for use.

Publication Year 2020
Title Identify sources of high E. coli concentrations, beaches of southern Lake Michigan, 2015, (version 2.0, July 2020)
DOI 10.5066/F7H70F3D
Authors Meredith Nevers, Muruleedhara Byappanahalli, Dawn A Shively
Product Type Data Release
Record Source USGS Digital Object Identifier Catalog
USGS Organization Great Lakes Science Center