Effects of four organic pollutants on the growth of natural marine bacterioplankton populations

Hudak, JP; Fuhrman, Jed A.

doi:10.3354/meps047185

Cited by 12 publications

(5 citation statements)

References 22 publications

(13 reference statements)

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“…Thus, changes in environmental conditions transform the microbial activities, thereby conferring significant impact to the ecosystem (Choi et al 2002). In fact, marine bacteria's response to the addition of inhibitory substances, organic pollutants and heat has been studied elsewhere (Cole et al 1988;Hudak and Fuhrman 1988;White et al 1991;Shiah and Ducklow 1994;Saravanane et al 1998;Choi et al 2002;Anupkumar et al 2005, Poornima et al 2005, 2006. These studies highlight the inhibition of microbial activities by anoxia and showed similarities in their distribution due to the homogenization of the watercolumn temperature profile in the mixing zone.…”

Section: Introductionmentioning

confidence: 91%

Comparative effect of temperature on biofilm formation in natural and modified marine environment

Rao

2009

Aquat Ecol

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Progression of biofilm formation was monitored at two stations near a nuclear power plant, Kalpakkam, located near coastal waters of Bay of Bengal. These stations are natural marine environment, station 1; and the condenser outfall area of the power plant the modified marine environment station 2. The biofilm formed on plexiglas panels was analysed in triplicates at 24 h intervals for various physical, chemical and biological parameters for 120 h (5 days). The biofilm formation showed both temporal and spatial variation in various parameters assayed. Among the water-quality parameters analysed, seawater temperature showed significant increase (*5°C) at station 2. The increase in water temperature enhanced the metabolism and influenced most of the biofilm parameters assayed at station 2. Biofilm formed at station 2 was very thick (113 lm) than that of at station 1 (22 lm). The distribution of parameters like biofilm thickness, biomass, chlorophyll a, particulate organic carbon, hexose sugar and diatom counts showed similar trend (i.e., a sharp increase after 96 h of biofilm growth) in the biofilm formed at station 2. Moderately high ammonia levels (44 lg l -1 ) were detected in the biofilm formed at station 2. The biofilm microbiota was diverse at both the stations: it constituted bacteria [nitrate reducers (NRB), ammonia oxidizers (AOB) and culturable aerobic heterotrophic bacteria (CAHB)], algae and macrofoulants. The various bacterial types assayed showed a population range from 10 2 to 10 6 cfu cm -2 . The final community after 120 h at station 1 comprised CAHB, NRB, diatoms, barnacle cyprids and juvenile bryozoans. At station 2, the biofilm initially consisted of CAHB, NRB and diatoms but after 120 h, AOB, cyanobacteria and filamentous algae were dominant. The plausible factors that influenced biofilm formation were temperature, nutrients and organic matter. The biofilm phenomenon in natural and modified marine environment was hypothesized and discussed.

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Section: Introductionmentioning

confidence: 91%

Comparative effect of temperature on biofilm formation in natural and modified marine environment

Rao

2009

Aquat Ecol

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“…Organic matter in surface waters is mineralized by planktonic and benthic bacteria, organisms whose activity is crucial for nutrient cycles and food webs [I]. Numerous studies have indicated that metabolic processes of microorganisms are very sensitive to pollutants [2,3] and hence the in situ activity of microbial communities has been used for establishing the effects of perturbations. The responses of aquatic bacteria to toxicants have been studied with various microbial techniques, including respiratory activity [4], acetate incorporation, glucosidase activity [ 5 ] , and, more recently, glucose metabolism [6], thymidine incorporation [7,8], and enzyme activity [9,10].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Bacterioplankton in the Rhine River to Various Toxicants Measured by Thymidine Incorporation and Activity of Exoenzymes

Tubbing¹,

Admiraal²

1991

Environ Toxicol Chem

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Natural populations of bacteria in water samples from the lower Rhine River were tested for their sensitivity to selected toxicants. Bacterial growth, measured as [3H-methyl] thymidine incorporation, was affected by additions of 5 pg Cu L-'; these concentrations were similar to the copper concentrations found in the river. Concentrates of the organic fraction from river water, obtained via XAD-columns, affected thymidine incorporation in samples of river water when added in concentrations corresponding to ambient levels. The exoenzymatic activities of phosphatase and protease decreased systematically at concentrations higher than 5 pg Cu L-' . Potassium dichromate (K2Cr207) at a concentration of approximately 3 mg L-' and a detergent tetrapropylbenzene sulfonate (TPBS) at a concentration of 5 mg L-' had detectable effects on microbial activity. Atrazine affected the growth rate but not the enzymatic activity of bacterial populations when this herbicide was added in concentrations of 50 to 200 pg L-I. Thymidine incorporation was more sensitive to all test compounds than the enzymatic activities. It is concluded that the present pollution levels, although decreased, are still likely to affect microbial processes in the river.

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“…Changes in microbial activities caused by changes in environmental conditions will thus confer significant impacts on functions of coastal ecosystems. In fact, marine bacterial responses to additions of inhibitory substances and organic pollutants have been extensively studied (Azam et al 1977, Siebers et al 1981, Hudak & Fuhrman 1988, Riemann & Lindgaard-Jørgensen 1990. Responses of marine bacteria and heterotrophic nanoflagellates (HNF) to temperature changes have also been studied in detail (Marrasé et al 1992, Shiah & Ducklow 1994.…”

Section: Introductionmentioning

confidence: 99%

Effects of thermal effluents from a power station on bacteria and heterotrophic nanoflagellates in coastal waters

Choi¹,

Park²,

Hwang³

et al. 2002

Mar. Ecol. Prog. Ser.

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To investigate effects of thermal effluents from a coastal power station on bacteria and heterotrophic nanoflagellates (HNF) in adjacent coastal waters, surface distributions of bacteria and HNF and interrelations between microbial and environmental variables were studied in November 1998 and July, August and November 1999 near Hadong Power Station, Korea. In addition, manipulation experiments with treatments of high temperature (40°C; temperature in the cooling system of the power station) and additions of hypochlorite and dilution experiments of thermal effluents with intake seawaters were carried out. Water temperature in the discharge-channel was always 5 to 10°C higher than the ambient temperature, but bacterial production, HNF abundance and grazing rates on bacteria, as well as chlorophyll a concentrations, were always lower there and increased with distance from the power station. Manipulation experiments showed that addition of hypochlorite had much more deleterious effects on bacteria and HNF (95 to 98% inhibition of bacterial production and 25 to 45% decrease in HNF abundance at 0.13 ppm of residual chlorine) than high temperature (9 to 39% inhibition of bacterial production but no inhibition of HNF abundance at 40°C). Dilutions of thermal effluents from the outlet and condenser tube with intake seawater would bring < 0.03 ppm of residual chlorine, but inhibitory effects of thermal effluents on bacterial production and HNF grazing activity (23 to 69% inhibition of bacterial production and 31 to 36% inhibition of HNF grazing) were shown, indicating inhibitory potential of chlorination by-products in the discharged water on coastal microbes. Analyses of horizontal distributions of microbial variables, manipulation and dilution experiments gave consistently similar results of inhibitory effects of thermal effluents on bacteria and HNF. Our work suggests that a microbial ecological approach is useful in estimating influences of thermal pollution on microbes in aquatic environments.

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Effects of four organic pollutants on the growth of natural marine bacterioplankton populations

Cited by 12 publications

References 22 publications

Comparative effect of temperature on biofilm formation in natural and modified marine environment

Comparative effect of temperature on biofilm formation in natural and modified marine environment

Sensitivity of Bacterioplankton in the Rhine River to Various Toxicants Measured by Thymidine Incorporation and Activity of Exoenzymes

Effects of thermal effluents from a power station on bacteria and heterotrophic nanoflagellates in coastal waters

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