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Genotypic variation in tolerance and resistance to fouling in the brown alga Fucus vesiculosus

  • Ecophysiology
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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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Acknowledgements

We thank Nina Heikkilä, Anne Muola and Roosa Leimu for valuable laboratory and field assistance, and the Archipelago Research Institute of the University of Turku for providing facilities. We are grateful to Riitta Koivikko and Johanna Oja for conducting the chemical analyses. The insightful comments of the two anonymous referees are greatly appreciated. The research was funded by the Academy of Finland (Projects 44086 and 53832) and by the Wihuri Foundation.

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  1. Section of Ecology, Department of Biology, University of Turku, 20014, Turku, Finland

    Tuija Honkanen & Veijo Jormalainen

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  1. Tuija Honkanen
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  2. Veijo Jormalainen
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Correspondence to Tuija Honkanen.

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Communicated by Christian Koerner

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Honkanen, T., Jormalainen, V. Genotypic variation in tolerance and resistance to fouling in the brown alga Fucus vesiculosus . Oecologia 144, 196–205 (2005). https://doi.org/10.1007/s00442-005-0053-0

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