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Impact of Irgarol 1051 on the larval development and metamorphosis of Balanus amphitirite Darwin, diatom, Amphora coffeaformis and natural biofilm

DRS at CSIR-National Institute of Oceanography

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Title Impact of Irgarol 1051 on the larval development and metamorphosis of Balanus amphitirite Darwin, diatom, Amphora coffeaformis and natural biofilm
 
Creator Desai, D.V.
 
Subject larval development
metamorphosis
biofilms
fouling organisms
algicides
Balanus amphitrite
 
Description The effect of Irgarol 1051 on the biofilm-forming diatom, Amphora coffeaformis, and on natural biofilm was assessed. A reduction in the number of A. coffeaformis cells within a biofilm was observed after treatment with Irgarol 1051, confirming its role as an inhibitor of photosynthetic activity. The impact of this compound on the development of nauplii of Balanus amphitite was evaluated through its impact on Chaetoceros calcitrans, which was provided as food for the larvae. A reduction in the number of cells of C. calcitrans was observed when treated with Irgarol 1051. When larvae of B. amphitite were reared using C. calcitrans in the presence of Irgarol 1051, their mortality increased with an increase in the concentration of Irgarol 1051 (13% at 1?g L-1 to 40% at 1000?g L-1) compared to the control (6%). Nauplii reared in the presence of Irgarol 1051 developed more slowly (6-7 days) compared to control larvae (4-5days). Cyprid bioassay results indicated an increase in percentage metamorphosis (76%) when natural biofilms were treated with the highest concentration of Irgarol 1051, compared to untreated biofilm (28%). The enhanced rate of metamorphosis appeared to be related to an increase in bacterial numbers in the biofilm, which may have been due to lysis of diatoms caused by Irgarol 1051. A. coffeaformis biofilms that were grown in the presence of antibiotics showed a significant reduction in cell numbers, which on further treatment with Irgarol 1051 showed an increase in cell numbers. Thus, it can be hypothesized that A. coffeaformis that was subjected to stress twice may have expressed resistant genes. Furthermore, if plasmids are present in the biofilms, they may enhance transfer to the surviving cells making them more resistant to hostile conditions.
 
Date 2008-10-17T07:38:49Z
2008-10-17T07:38:49Z
2008
 
Type Journal Article
 
Identifier Biofouling, vol.25(5); 393-403p.
http://drs.nio.org/drs/handle/2264/1451
 
Language en
 
Rights The final and definitive form of the preprint has been published in the "Biofouling" ? 2007 Taylor & Francis; "Biofouling" is available online at http://www.informaworld.com/ with open URL of artilce : http://www.informaworld.com/openurl?genre=article&issn=0892-7014&volume=24&spage=393
 
Publisher Taylor & Francis