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Elucidation of the microbial diversity in rivers in south-west Victoria, Australia impacted by rural agricultural contamination (dairy farming)
journal contributionposted on 2019-05-01, 00:00 authored by Arturo Aburto-Medina, Esmaeil Shahsavari, Scott SalzmanScott Salzman, Andrew Kramer, Andrew S Ball, Graeme Allinson
We assessed the water quality of south-west Victorian rivers impacted by the dairy industry using traditional water quality assessment together with culture-dependent (colilert/enterolert) and also culture-independent (next generation sequencing) microbial methods. The aim of the study was to identify relationships/associations between dairy farming intensity and water contamination. Water samples with high total and faecal coliforms (>1000 MPN cfu/100 ml), and with high nitrogen levels (TN) were observed in zones with a high proportion of dairy farming. Members of the genus Nitrospira, Rhodobacter and Rhodoplanes were predominant in such high cattle density zones. Samples from sites in zones with lower dairy farming activities registered faecal coliform numbers within the permissible limits (<1000 MPN cfu/100 ml) and showed the presence of a wide variety of microorganisms. However, no bacterial pathogens were found in the river waters regardless of the proportion of cattle. The data suggests that using the spatially weighted proportion of land used for dairy farming is a useful way to target at-risk sub-catchments across south west Victoria; further work is required to confirm that this approach is applicable in other regions.
JournalEcotoxicology and environmental safety
Pagination356 - 363
LocationAmsterdam, The Netherlands
Publication classificationC1 Refereed article in a scholarly journal; C Journal article
Copyright notice2019, Elsevier Inc.
Faecal coliformsNitrospiraRhodobacterRhodoplanesRiver waters qualityScience & TechnologyLife Sciences & BiomedicineEnvironmental SciencesToxicologyEnvironmental Sciences & EcologyFECAL SOURCE TRACKINGRNA GENETIC-MARKERSWASTE-WATERSP-NOV.POLYCHLORINATED-BIPHENYLSBACTERIAL COMMUNITYZOONOTIC PATHOGENSESCHERICHIA-COLIOXIDATIVE STRESSDIGESTIVE GLANDInformation Systems