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Antibacterial activity of the sponge Ircinia ramosa: Importance of its surface-associated bacteria

DRS at CSIR-National Institute of Oceanography

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Title Antibacterial activity of the sponge Ircinia ramosa: Importance of its surface-associated bacteria
 
Creator Thakur, N.L.
Anil, A.C.
 
Subject marine invertebrates
microorganisms
fouling organisms
water column
antibiotics
intertidal environment
Ircinia ramosa
 
Description Variations in the antibacterial activity of the sponge Ircinia ramosa were evaluated during two collection periods (January and May) against vicinity fouling bacteria (VFB) and sponge surface-associated bacteria (SAB). The density of fouling bacteria in the water column, as well as epibacterial abundance on the sponge surface, was enumerated during both collections, and both increased in the warmer month of May. The extracts obtained from SAB were also tested for their role in antibacterial activity of the host. Sponge-associated bacteria are capable of producing antibacterial metabolites. The antibacterial activity that originated from polar fractions in the cooler month of January shifted towards the nonpolar fractions in May. Nonpolar fractions were more useful for the sponge when threatened with increased bacterial density. Thus, the chemical nature and production of antibacterial compounds produced by sponge or its associated bacteria appears to be governed by the environment. An inverse relationship was observed between the epibacterial abundance over the sponge surface in nature and the antibacterial activity displayed by the sponge extracts in laboratory bioassays. This investigation reveals the importance of collection period as well as the role of associated bacteria in the evaluation of antibacterial activity.
 
Date 2009-01-09T07:48:54Z
2009-01-09T07:48:54Z
2000
 
Type Journal Article
 
Identifier Journal of Chemical Ecology, Vol.26; 57-73p.
http://drs.nio.org/drs/handle/2264/1624
 
Language en
 
Rights Copyright [2000]. 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 Springer