Occurrence and removal of fecal bacteria and microbial source tracking markers in a stormwater detention basin overlying the Edwards Aquifer recharge zone in Texas

Flores, Mauricio Eduardo; Jafarzadeh, Arash; Moghadam, Sina Vedadi; Vadde, Kiran Kumar; Dhar, Dipti Anik; Nunu, Rebecca R.; Kapoor, Vikram

doi:10.1007/s11356-023-29636-w

Cited by 2 publications

(1 citation statement)

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“…The use of MST to provide evidence of specific faecal sources provides additional evidence for water managers to apply targeted mitigation strategies to reduce contamination (Devane et al, 2018 ; Harwood et al, 2014 ; Tran et al, 2015 ; Weller et al, 2020 ). Although dominant Avian faecal sources were widespread in water samples from all land‐uses including low impact (Table 4 ) and in previous study (Flores et al, 2023 ), other research using the same avian qPCR (GFD) detected avian faecal sources only rarely (Weller et al, 2020 ). Comparison of MST markers and E. coli phylotype B1 (Table S6 ) also correlated with the phylotype association with land‐use noted before (Table S2 ) where phylotype B1 was associated with ruminants (de Castro et al, 2014 ; Johnson et al, 2017 ; Massot et al, 2017 ).…”

Section: Discussionmentioning

confidence: 54%

Population structure and pathogen interaction of Escherichia coli in freshwater: Implications of land‐use for water quality and public health in Aotearoa New Zealand

Cookson,

Devane,

Marshall

et al. 2024

Environ Microbiol Rep

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Freshwater samples (n = 199) were obtained from 41 sites with contrasting land‐uses (avian, low impact, dairy, urban, sheep and beef, and mixed sheep, beef and dairy) and the E. coli phylotype of 3980 isolates (20 per water sample enrichment) was determined. Eight phylotypes were identified with B1 (48.04%), B2 (14.87%) and A (14.79%) the most abundant. Escherichia marmotae (n = 22), and Escherichia ruysiae (n = 1), were rare (0.68%) suggesting that these environmental strains are unlikely to confound water quality assessments. Phylotypes A and B1 were overrepresented in dairy and urban sites (p < 0.0001), whilst B2 were overrepresented in low impact sites (p < 0.0001). Pathogens ((Salmonella, Campylobacter, Cryptosporidium or Giardia) and the presence of diarrhoeagenic E. coli‐associated genes (stx and eae) were detected in 89.9% (179/199) samples, including 80.5% (33/41) of samples with putative non‐recent faecal inputs. Quantitative PCR to detect microbial source tracking targets from human, ruminant and avian contamination were concordant with land‐use type and E. coli phylotype abundance. This study demonstrated that a potential recreational health risk remains where pathogens occurred in water samples with low E. coli concentration, potential non‐recent faecal sources, low impact sites and where human, ruminant and avian faecal sources were absent.

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