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Title: Adhesion in barnacles with specific reference to Elminius modestus
Author: Robson, Martha Anne
ISNI:       0000 0004 2742 6108
Awarding Body: University of Newcastle Upon Tyne
Current Institution: University of Newcastle upon Tyne
Date of Award: 2009
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Abstract Understanding the factors that affect settlement and adhesion strength of barnacles to foul-release coatings will help the development of future commercial foul-release coatings. However, these factors are many and complex. This thesis concentrated on the barnacle Elminius modestus and was separated into two sections. Section one tested the hypothesis that biogeography determines genetic variation and section two tested the hypothesis that coating colour affected adhesion strength and recruitment. These aims were met with some unexpected and intriguing results. In order to quantify variation in adhesion strength, six colour panels of a commercial foul-release coating, IS700®, were immersed at eight locations in the UK. Push-off tests were employed to test the adhesion strength of E. modestus to the coatings. Formulation was characterised by analysing surface energy, surface roughness, dry film thickness and using pseudobarnacles. The most efficient DNA extraction protocol was found to be using barnacle cirri and the Dnamite® extraction kit. Mitochondrial DNA markers and microsatellite loci were used to investigate barnacle population structure. Analysis of the data suggested that there was a correlation between coating colour and strength of adhesion and coating colour and recruitment density of E. modestus to commercially available foul-release coatings. Basal area was found to be directly related to strength of adhesion. Adhesion strength varied from site and by year. Pseudobarnacle push-off data was found not to be a good predictor of live barnacle push-off data. Barnacle population structure indicated transport of barnacles as fouling organisms on ships. A discussion of barnacle adaptation concluded that it is possible that barnacle species may become locally adapted 4 to foul-release coatings and that environmental variation such as temperature and fetch affect haplotype frequency. There was no correlation between haplotype frequency and adhesion strength. Overall conclusions of this thesis are that there are many interacting and complex factors that affect E. modestus adhesion to foul-release coatings.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available