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Effect of chlorination on the development of marine biofilms dominated by diatoms

DRS at CSIR-National Institute of Oceanography

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Title Effect of chlorination on the development of marine biofilms dominated by diatoms
 
Creator Patil, J.S.
Jagadeesan, V.
 
Subject biofilms
diatoms
pulse chlorination
antifouling
 
Description This study addressed the antifouling efficiency of commercially available chlorine at different concentrations (0.5%, 1%, and 2%) and exposure times (0.5 min, 1 min, 5 min, and 15 min). The rapid and non-destructive FIRe (fluorescence induction and relaxation) technique was used to evaluate the effects of the biocide on diatom dominated biofilms. The efficiency of chlorine in removing diatoms from the developed biofilms increased with an increase in concentration and exposure time. The fluorescence measurements revealed low Fv/Fm and high sigma PSII values for chlorine-treated Navicula and Amphora biofilms indicating that chlorination was efficient in damaging the photosystem-II reaction centers. Chlorination also caused mortality of diatom cells by damaging the cell body. In natural biofilms, the biocidal effect of chlorine was species specific; species of Amphiphrora, Navicula, Cylindrotheca, and Coscinodiscus showed an increase in the density of the population, but species of Pleurosigma, Amphora, and Thalassionema did not increase in density after chlorine treatment. It was also demonstrated that diatoms can colonize, grow and photosynthesize on chlorine-treated surfaces. Under pulse chlorination (treatment every 6 h), irrespective of chlorine concentration, the development of biofouling decreased with an increase in exposure time. Differences between exposure times of 1 to 15 min were not significant. Additionally, transmission levels of the control (non-chlorine-treated) fouled coupons reduced significantly (approx. 20%) compared to the chlorine-treated fouled coupons (< 2%). These results suggest that chlorine can be used as a biocide to control the development of diatom biofilms
 
Date 2011-03-11T09:35:33Z
2011-03-11T09:35:33Z
2011
 
Type Journal Article
 
Identifier Biofouling, vol.27(3); 2011; 241-254
no
http://drs.nio.org/drs/handle/2264/3818
 
Language en
 
Relation Biofouling_27_241.jpg
 
Rights The final and definitive form of the preprint has been published in the "Biofouling" ? 2011 Taylor & Francis; "Biofouling" is available online at http://www.informaworld.com/ with open URL of artilce : http://www.informaworld.com/smpp/content~db=all?content=10.1080/08927014.2011.559582
 
Publisher Taylor & Francis