Colonisation and succession of marine biofilm-dwelling ciliate assemblages on biocidal antifouling and fouling-release coatings in temperate Australia |
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Authors: | Matthew G. Watson Andrew J. Scardino Liliana Zalizniak Jeff Shimeta |
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Affiliation: | 1. Centre for Environmental Sustainability and Remediation, School of Applied Sciences, RMIT University, Bundoora, Australiamatt_watson@live.com.au;3. Maritime Platforms Division, Defence Science and Technology Organisation, Fishermans Bend, Australia;4. Centre for Environmental Sustainability and Remediation, School of Applied Sciences, RMIT University, Bundoora, Australia |
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Abstract: | Ciliate assemblages are often overlooked, but ubiquitous components of microbial biofilms which require a better understanding. Ciliate, diatom and bacterial colonisation were evaluated on two fouling-release (FR) coatings, viz. Intersleek 970 and Hempasil X3, and two biocidal antifouling (AF) coatings, viz. Intersmooth 360 and Interspeed 5640, in Port Phillip Bay, Australia. A total of 15 genera were identified during the 10 week deployment. Intersleek 970 displayed the most rapid fouling by ciliates, reaching 63.3(± 5.9) cells cm?2. After 10 weeks, all four coatings were extensively fouled. However, the toxicity of the AF coatings still significantly inhibited microbial fouling compared to the FR coatings. On all treatments, colonies of sessile peritrichs dominated the ciliate assemblage in the early stage of succession, but as the biofilm matured, vagile ciliates exerted more influence on the assemblage structure. The AF coatings showed selective toxic effects, causing significant differences in the ciliate species assemblages among the treatments. |
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Keywords: | microbial biofilms ciliates microbial ecology microbial assemblage structure fouling-release antifouling paints |
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