Watershed
Assessment with Beach Microbial Source Tracking
and Outcomes of Resulting Gull Management
Version 4 2017-08-18, 08:16
Version 3 2016-09-14, 14:03
Version 2 2016-09-07, 14:20
Version 1 2016-08-30, 19:47
Posted on 2017-08-18 - 08:16
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maximum daily load (TMDL) implementation at a southern California
beach involved ultraviolet treatment of watershed drainage that provided
>97% reduction in fecal indicator bacteria (FIB) concentrations.
However,
this pollutant control measure did not provide sufficient improvement
of beach water quality, prompting further assessment. Investigation
included microbial source tracking (MST) for human, gull, and canine
fecal sources, monitoring of enterococci and fecal coliform, and measurement
of chemical and physical water quality parameters for samples collected
from watershed, groundwater, and beach sites, including a beach scour
pond and tidal creek. FIB variability remained poorly modeled in regression
analysis. However, MST revealed correlations between FIB and gull
source tracking markers, leading to recommendations to manage gulls
as a pollutant source. Beach conditions were followed for three years
after implementation of a best management practice (BMP) to abate
gulls using a falconry program for the beach and an upland landfill.
The gull abatement BMP was associated with improved beach water quality,
and this appears to be the first report of falconry in the context
of TMDL implementation. Overall, MST data enabled management action
despite an inability to fully model FIB dynamics in the coupled watershed–beach
system.
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Goodwin, Kelly D.; Gruber, Steve; Vondrak, Mary; Crumpacker, Andrea (2016). Watershed
Assessment with Beach Microbial Source Tracking
and Outcomes of Resulting Gull Management. ACS Publications. Collection. https://doi.org/10.1021/acs.est.6b02564
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AUTHORS (4)
KG
Kelly D. Goodwin
SG
Steve Gruber
MV
Mary Vondrak
AC
Andrea Crumpacker
KEYWORDS
management practicepollutant control measuremanagement actionmodel FIB dynamicsTMDL implementationwater quality parametersgull abatement BMPbeach siteswatershed drainagepollutant sourcefalconry programindicator bacteriabeach conditionsBeach Microbial Source Trackinggull sourceResulting Gull ManagementFIB variabilitybeach water qualityregression analysisCalifornia beachWatershed AssessmentMST data