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Bacterial source tracking and shellfish contamination in a coastal catchment
1School of Environment and Life Sciences, The University of Newcastle, New South Wales, Australia. ggpmg@cc.newcastle.edu.au
Summary
Bacterial source tracking identified multiple sources of fecal contamination in shellfish growing areas, indicating complex catchment management is needed. This research helps protect public health in estuarine environments.
Area of Science:
- Environmental microbiology
- Aquatic ecology
- Public health
Background:
- Pathogens in aquatic environments pose risks to shellfish and public health.
- Shellfish are susceptible to contamination from various catchment sources like sewage and runoff.
- Microbiological indicators are used to assess contamination levels.
Purpose of the Study:
- To apply bacterial source tracking (BST) in a New South Wales shellfish growing area.
- To identify the sources of fecal contamination affecting shellfish.
- To inform catchment management strategies for estuarine shellfish industries.
Main Methods:
- Isolated fecal streptococci (FS) from potential sources (cattle, chickens, humans) and estuarine samples.
- Analyzed antibiotic resistance patterns of FS isolates.
- Used discriminant analysis to classify the sources of unknown FS isolates.
Main Results:
- Antibiotic resistance patterns varied among different fecal sources.
- Discriminant analysis successfully classified FS isolates from known sources.
- Preliminary results indicate mixed sources of fecal contamination in the Tilligerry Creek estuary.
Conclusions:
- No single significant source of fecal contamination was identified.
- Multiple sources contribute to fecal contamination in the studied shellfish growing area.
- Findings emphasize the need for integrated land use and catchment management for estuarine health.