Genotypic variation in tolerance and resistance to fouling in the brown alga <Emphasis Type="Italic">Fucus vesiculosus</Emphasis> |
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Authors: | Email author" target="_blank">Tuija?HonkanenEmail author Veijo?Jormalainen |
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Institution: | (1) Section of Ecology, Department of Biology, University of Turku, 20014 Turku, Finland |
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Abstract: | In this study, we examined genetic variation in resistance and tolerance to fouling organisms in the brown alga Fucus vesiculosus. We first grew 30 algal genotypes in the field, where we allowed fouling organisms to colonise the genotypes at natural levels.
We then conducted a manipulative experiment, where we grew 20 genotypes of algae in aquaria with or without fouling organisms.
We measured host resistance as the load of fouling organisms and tolerance as the slope of the regression of algal performance
on fouling level. Fouling organisms decreased host growth and contents of phlorotannins and thus have the potential to act
as selective agents on algal defenses. We found significant among-genotype variation in both resistance and tolerance to fouling.
We did not find a trade-off between resistance and tolerance. We found a marginally significant cost of resistance, but no
cost of tolerance. Our results thus indicate that both the tolerance and resistance of F. vesiculosus can evolve as a response to fouling and that the costs of resistance may maintain genetic variation in resistance. |
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Keywords: | Cost of resistance Cost of tolerance Host-fouling organisms interactions Phlorotannins Tolerance trait |
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