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Influence of bacterial exopolymers, conspecific adult extract and salinity on the cyprid metamorphosis of Balanus amphitrite (Cirripedia: Thoracica)

DRS at CSIR-National Institute of Oceanography

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Title Influence of bacterial exopolymers, conspecific adult extract and salinity on the cyprid metamorphosis of Balanus amphitrite (Cirripedia: Thoracica)
 
Creator Anil, A.C.
Khandeparker, R.
 
Subject fouling organisms
biodegradable substances
salinity effects
chemical extraction
shells
metamorphosis
larval settlement
controlled conditions
Balanus amphitrite
 
Description The influence of bacterial exopolymers and conspecific adult extract of Balanus amphitrite on metamorphosis of cyprid larvae at different salinities has been evaluated through laboratory assay. The bacterial exopolymers (epm) extracted from Pseudomonas, Acinetobacter and Enterobacteriaceae strains, isolated from the shell surface of B. amphitrite, were examined for their influence on metamorphosis, both individually and in combination with conspecific adult extract at 15, 25, 35 and 45 ppt salinities. The epm extracted from the pool of these three strains (mixed culture) was also tested similarly. The influence of epm varied with the strain of bacteria and salinity. The surface condition and time interval significantly influenced the metamorphosis rate. The interaction between these two variables, however, did not change in any combination, irrespective of the bacterial strain used. The Pseudomonas epm promoted metamorphosis at 15 ppt, but was inhibitory at 45 ppt. The Acinetobacter epm induced metamorphosis to a level of 71 plus or minus 15% at 15 ppt. No such metamorphosis promotion was observed with the epm of this strain at higher salinities and the influence was less than the conspecific adult extract. The epm of Enterobacteriaceae and mixed culture epm did not promote metamorphosis. There was no appreciable change in the metamorphic rate in the control conditions at 25 ppt, 35 ppt and 45 ppt salinities and the rate was much lower than that obtained with conspecific adult extract. At 15 ppt, however, the influence of adult extract was closer to that of the control condition. This shows that even in the absence of any attractant, the settlement intensity is positively influenced at mid-salinity of the barnacles' natural distributional range
 
Date 2009-01-11T11:51:30Z
2009-01-11T11:51:30Z
1998
 
Type Journal Article
 
Identifier Marine Ecology P.S.Z.N.I., Vol.19; 279-292p.
http://drs.nio.org/drs/handle/2264/1901
 
Language en
 
Rights Copyright [1998]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Blackwell