Salinity-induced survival strategy of Vibrio cholerae associated with copepods in Cochin backwaters

Thomas, Katja; Joseph, Neetha; Raveendran, O.; Nair, Shanta

doi:10.1016/j.marpolbul.2006.04.011

Cited by 23 publications

(19 citation statements)

References 22 publications

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“…In particular, parameter estimates indicated a strong direct relationship between Vibrio concentration and the relative abundance of copepods in the 4200-mm fraction. Copepods have been implicated as a potential vector of V. cholerae Colwell et al, 2003), and an ecological relationship between V. cholerae and copepods has been suggested earlier (Huq et al, 1983(Huq et al, , 1984Tamplin et al, 1990;Thomas et al, 2006). Conversely, a negative association was noted between copepods and Vibrio in the 63-200-mm fraction, which may reflect differences in copepod life stages between the fractions.…”

Section: Discussionmentioning

confidence: 87%

Plankton composition and environmental factors contribute to Vibrio seasonality

et al. 2009

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Plankton represent a nutrient-rich reservoir capable of enriching Vibrio species, which can include human pathogens, at higher densities than the surrounding water column. To better understand the relationship between vibrios and plankton, the partitioning of culturable vibrios, on TCBS, between free living and plankton associated (63-200-and 4200-lm-size fractions) was monitored over a 1-year period in coastal waters of Georgia, USA. Seasonal changes in the total Vibrio concentration were then compared with changes in environmental parameters as well as changes in the relative composition of the plankton community. Using univariate analyses, Vibrio concentrations were strongly associated with temperature, especially when those vibrios were plankton associated (R 2 ¼ 0.69 and 0.88 for the water and both plankton fractions; respectively) (Po0.01). Multivariate general linear models revealed that Vibrio concentrations in the plankton fractions were also correlated to shifts in the relative abundance of specific plankton taxa. In the 63-200-lm fraction, Vibrio concentrations were inversely associated with copepods, cyanobacteria and diatoms. In the 4200-lm fraction, Vibrio concentrations were positively associated with copepods and negatively associated with decapod larvae. Our results confirm the role of temperature in Vibrio seasonality and highlight an important and independent role for plankton composition in explaining seasonal changes in Vibrio concentration.

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Section: Discussionmentioning

confidence: 87%

Plankton composition and environmental factors contribute to Vibrio seasonality

et al. 2009

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“…Since the discovery that V. cholerae can enter the VBNC state (Xu et al, 1982), many bacteria, pathogens as well as non-pathogens, have been shown to enter the VBNC state under unfavorable conditions (McDougald et al, 1998, 1999; Oliver, 2005, 2010). Factors known to induce VBNC formation in V. cholerae include extremes in temperature and salinity as well as nutrient deprivation (Colwell et al, 1985; Ravel et al, 1995; Carroll et al, 2001; González-Escalona et al, 2006; Thomas et al, 2006; Mishra et al, 2012). VBNC cells of V. cholerae have been detected on the surface of higher organisms, such as crustaceans and algae in the plankton and benthos, attached to chironomid egg masses, as well as suspended in bacterioplankton (e.g., Louis et al, 2003; Binsztein et al, 2004; Alam et al, 2007; Halpern et al, 2007).…”

Section: “Viable But Non-culturable” V Cholerae In Planktonmentioning

confidence: 99%

“…Vibrio spp. grow preferably at salinities <25 ppt (e.g., Jiang, 2001; Thomas et al, 2006; Baker-Austin et al, 2010). In high salinity environments V. cholerae increases the production of the protective pigment, melanin (Coyne and al-Harthi, 1992), which provides UV resistance (Valeru et al, 2009).…”

Section: Vibrio Cholerae Responses To Environmental Stresses – Bottommentioning

confidence: 99%

“…One such strategy is the conversion into a viable but non-culturable (VBNC) state during unfavorable conditions (Colwell, 2000; Thomas et al, 2006). Additionally, V. cholerae attaches to abiotic and biotic surfaces (chitinous as well as gelatinous zoo- and phytoplankton) as biofilms (e.g., Huq et al, 1996; Akselman et al, 2010; Shikuma and Hadfield, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Environmental reservoirs and mechanisms of persistence of Vibrio cholerae

Lutz¹,

Erken²,

Noorian³

et al. 2013

Front. Microbiol.

228

185

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It is now well accepted that Vibrio cholerae, the causative agent of the water-borne disease cholera, is acquired from environmental sources where it persists between outbreaks of the disease. Recent advances in molecular technology have demonstrated that this bacterium can be detected in areas where it has not previously been isolated, indicating a much broader, global distribution of this bacterium outside of endemic regions. The environmental persistence of V. cholerae in the aquatic environment can be attributed to multiple intra- and interspecific strategies such as responsive gene regulation and biofilm formation on biotic and abiotic surfaces, as well as interactions with a multitude of other organisms. This review will discuss some of the mechanisms that enable the persistence of this bacterium in the environment. In particular, we will discuss how V. cholerae can survive stressors such as starvation, temperature, and salinity fluctuations as well as how the organism persists under constant predation by heterotrophic protists.

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“…Surprisingly, despite these correlations between salinity and vibrio abundance or virulence, the direct mechanistic effect of salt on vibrios has been investigated to only a limited extent. For V. cholerae, high salinity induces conversion to the viable but non-culturable (VBNC) state (Thomas et al, 2006), whereas for V. vulnificus higher salt concentrations in sterile water reduced viability (Kaspar and Tamplin, 1993).…”

Section: Pathogenic Vibrio Speciesmentioning

confidence: 99%

Microbial contamination and shellfish safety

Jones

2009

Shellfish Safety and Quality

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Salinity-induced survival strategy of Vibrio cholerae associated with copepods in Cochin backwaters

Cited by 23 publications

References 22 publications

Plankton composition and environmental factors contribute to Vibrio seasonality

Plankton composition and environmental factors contribute to Vibrio seasonality

Environmental reservoirs and mechanisms of persistence of Vibrio cholerae

Microbial contamination and shellfish safety

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