Distribution of faecal indicator bacteria in tropical waters of Peninsular Malaysia and their decay rates in tropical seawater

Wong, Yi You; Lee, Choon Weng; Chai, Stanley Choon Yip; Lim, Joon Hai; Bong, Chui Wei; Sim, Edmund Ui Hang; Narayanan, K.; Hii, Yii Siang; Wang, Ai‐Jun

doi:10.1016/j.marpolbul.2022.114297

Cited by 4 publications

(11 citation statements)

References 46 publications

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“…The surface water temperatures recorded at the five lakes were relatively high with low variability, and is typical of tropical waters ( Lim et al, 2018 ). The DO concentrations measured at Tasik Varsiti, Tasik Aman, Tasik Kelana and Tasik Central Park Bandar Utama were at healthy levels, and within the range previously reported for tropical freshwater ( Wong et al, 2022 ). However, for Tasik Taman Jaya, we observed hypoxic levels (2.65 ± 1.78 mg L −1 ) ( Farrell & Richards, 2009 ), which was not surprising as Wong et al (2022) had previously classified Tasik Taman Jaya at Class III for total coliform and Class V for faecal coliform, indicative of extensive treatment required for the suitability of water supply ( Department of Environment , 2008 ).…”

Section: Discussionsupporting

confidence: 88%

“…The total coliform abundance enumerated in five lake waters were within the range previously reported in Malaysia ( Wong et al, 2022 ). According to National Water Quality Standards for Malaysia, Tasik Varsiti, Tasik Taman Jaya and Tasik Kelana were categorized as Class V for total coliform, whereas Tasik Aman and Tasik Central Park Bandar Utama as Class III.…”

Section: Discussionsupporting

confidence: 84%

“…Since the abundance of E. coli in the upper water column is also affected by its growth or decay, we concurrently carried out habitat transition experiments with size-fractionation decay experiments according to Lee et al (2011) . Our results helped shed light on the possible reasons for the persistence of E. coli in urban tropical lakes as shown earlier by Wong et al (2022) , and could help improve the current water surveillance strategies.…”

Section: Introductionsupporting

confidence: 71%

“…According to National Water Quality Standards for Malaysia, Tasik Varsiti, Tasik Taman Jaya and Tasik Kelana were categorized as Class V for total coliform, whereas Tasik Aman and Tasik Central Park Bandar Utama as Class III. Relative to Wong et al (2022) , the water quality in these lakes had deteriorated over the last two years.…”

Section: Discussionmentioning

confidence: 99%

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Investigating Escherichia coli habitat transition from sediments to water in tropical urban lakes

Liu,

Lee,

Bong

et al. 2024

PeerJ

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Background Escherichia coli is a commonly used faecal indicator bacterium to assess the level of faecal contamination in aquatic habitats. However, extensive studies have reported that sediment acts as a natural reservoir of E. coli in the extraintestinal environment. E. coli can be released from the sediment, and this may lead to overestimating the level of faecal contamination during water quality surveillance. Thus, we aimed to investigate the effects of E. coli habitat transition from sediment to water on its abundance in the water column. Methods This study enumerated the abundance of E. coli in the water and sediment at five urban lakes in the Kuala Lumpur-Petaling Jaya area, state of Selangor, Malaysia. We developed a novel method for measuring habitat transition rate of sediment E. coli to the water column, and evaluated the effects of habitat transition on E. coli abundance in the water column after accounting for its decay in the water column. Results The abundance of E. coli in the sediment ranged from below detection to 12,000 cfu g–1, and was about one order higher than in the water column (1 to 2,300 cfu mL–1). The habitat transition rates ranged from 0.03 to 0.41 h–1. In contrast, the E. coli decay rates ranged from 0.02 to 0.16 h−1. In most cases (>80%), the habitat transition rates were higher than the decay rates in our study. Discussion Our study provided a possible explanation for the persistence of E. coli in tropical lakes. To the best of our knowledge, this is the first quantitative study on habitat transition of E. coli from sediments to water column.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 84%

Section: Introductionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 99%

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Investigating Escherichia coli habitat transition from sediments to water in tropical urban lakes

Liu,

Lee,

Bong

et al. 2024

PeerJ

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“…In this study, Enterococcus had significantly higher decay rate in seawater than E. coli (Table 1). This finding contradicts most others, in which Enterococcus was more resistant than E. coli in seawater (Byappanahalli et al, 2012;WHO, 1999;Wong et al, 2022). Furthermore, Enterococcus has been recommended for use as an indicator of seawater for years (USEPA, 2003;WHO, 1999).…”

Section: Survival Of Fib In Aquatic Environmentmentioning

confidence: 81%

Effects of chlorination on the survival of sewage bacteria in seawater microcosms

Tang,

Lau

2023

Environ Microbiol Rep

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Chlorination is a commonly used disinfection method in sewage treatment process. However, resistant bacteria may survive chlorination and enter the receiving aquatic environment upon effluent discharge. There has been limited research on the effects of chlorination on bacterial survival in seawater. To address this knowledge gap, microcosm experiments were conducted to simulate the discharge of chlorinated effluents into coastal seawater. The results revealed that bacterial communities in seawater‐based effluents survived better in seawater than those in freshwater‐based effluents. High chlorine dosages could significantly reduce the viable bacterial populations and their chance of regrowth in seawater. Additionally, faecal indicator bacteria (FIB) that entered the viable but non‐culturable (VBNC) state under chlorination tended to persist in the VBNC state without resuscitation during seawater incubation. Because of the prevalence of VBNC indicator bacteria, qPCR quantification of FIB was more effective than conventional culture‐based methods in tracing viable pathogenic chlorine‐resistant bacteria, although the correlation strength varied depending on the type of effluent. This study sheds light on how chlorine dosages and the intrinsic properties of effluents affect bacterial survival in seawater and highlights the potential and limitations of using FIB in monitoring the health risks associated with the discharge of chlorinated effluents.

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Microbiological safety assessment of Mediterranean mussels (Mytilus galloprovincialis) in Cala Iris Bay, Northern Morocco: a modeling approach for predicting Escherichia coli survival

Ngadi,

Layachi,

Azizi

et al. 2024

Euro-Mediterr J Environ Integr

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Distribution of faecal indicator bacteria in tropical waters of Peninsular Malaysia and their decay rates in tropical seawater

Cited by 4 publications

References 46 publications

Investigating Escherichia coli habitat transition from sediments to water in tropical urban lakes

Investigating Escherichia coli habitat transition from sediments to water in tropical urban lakes

Effects of chlorination on the survival of sewage bacteria in seawater microcosms

Microbiological safety assessment of Mediterranean mussels (Mytilus galloprovincialis) in Cala Iris Bay, Northern Morocco: a modeling approach for predicting Escherichia coli survival

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