Document Detail

Development of the initial diatom microfouling layer on antifouling and fouling-release surfaces in temperate and tropical Australia.
MedLine Citation:
PMID:  20183127     Owner:  NLM     Status:  MEDLINE    
Diatoms are a major component of the slime layers that form on artificial surfaces in marine environments. In this article, the role played by diatoms during the pioneering stages of colonization of three marine antifouling (AF) coatings, viz Intersmooth 360, Super Yacht 800 and a fouling-release (FR) coating Intersleek 700, was investigated. The study was conducted over three distinct seasons in two very different marine environments in Australia, ie temperate Williamstown, Victoria and tropical Cairns, Queensland. Diatom fouling occurred more rapidly on the FR coating Intersleek 700, compared to both biocidal AF paints. However, colonization by diatoms on all three coatings was generally slow during the 16-day study. Benthic diatoms do not subsist by floating around in the water column, rather they only gain the opportunity to colonize new surfaces when they either voluntarily release or are displaced from their benthic habitat, thereafter entering the water column where the opportunity to adhere to a new surface presents itself. However, once settled, fouling diatoms grow exponentially from the site of attachment, spreading out until they populate large areas of the surface. This mode of surface colonization correlates more with an 'infection' type, epidemiology model, a mechanism that accounts for the colonization of significant regions of the coating surface from a single fouling diatom cell, forming 'clonal patches'. This is in comparison to the bacterial colonization of the surface, which exhibits far more rapid recruitment and growth of cells on the substratum surface. Therefore, it is hypothesized that fouling diatoms may be characterized more by their ability to adhere and grow on surfaces already modified by bacterial biofilms, rather than on their strength of adhesion. Cell morphology and the ability to avoid shear may also be an important factor.
Paul J Molino; Ewan Campbell; Richard Wetherbee
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biofouling     Volume:  25     ISSN:  1029-2454     ISO Abbreviation:  Biofouling     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2010-02-25     Completed Date:  2010-06-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9200331     Medline TA:  Biofouling     Country:  England    
Other Details:
Languages:  eng     Pagination:  685-94     Citation Subset:  IM    
School of Botany, The University of Melbourne, Parkville, Victoria, Australia.
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MeSH Terms
Bacteria / growth & development
Biofilms / drug effects,  growth & development*
Colony Count, Microbial
Diatoms / classification,  drug effects,  growth & development*,  ultrastructure
Marine Biology
Microscopy, Electron, Scanning
Surface Properties
Tropical Climate*

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