Aquatic Ecology

, Volume 39, Issue 2, pp 201–211 | Cite as

Responses of growth and phlorotannins in Fucus vesiculosus to nutrient enrichment and herbivory

  • Anne Hemmi
  • Anita Mäkinen
  • Veijo Jormalainen
  • Tuija Honkanen
Article

Abstract

Discharge from anthropogenic sources may modify both macroalgal growth patterns and resource allocation to carbon based secondary compounds, thereby affecting their susceptibility for herbivory. We tested the effect of eutrophication in terms of nutrient enhancement on growth and phlorotannin concentration of Fucus vesiculosus by conducting manipulative experiments in the field and mesocosms. In the field experiment we utilised fish farms as nutrient sources and in the mesocosm-experiment we manipulated ambient nutrient levels and occurrence of the herbivorous isopod Idotea baltica. Vicinity of a fish farm affected neither growth nor the phlorotannin concentration of Fucus but increased the amount of epiphytes growing on Fucus. Other organisms such as epiphytic filamentous algae and periphyton, which are more capable of quickly utilizing excess nutrients, may restrain the direct effects of nutrient enhancement on Fucus. In a manipulative mesocosm experiment, neither nutrient enrichment nor occurrence of herbivores affected phlorotannin concentration implying lack of induced defences, at least in terms of increasing phlorotannin concentration. Feeding of thallus decreased the growth rate of algae, but the number of reproductive organs, receptacles, was not affected by herbivory. The negative effect of herbivory on the amount of apical tips tended to be stronger under nutrient enriched conditions. We conclude that eutrophication processes, in terms of nutrient enrichment, does not have strong direct effect on growth or phlorotannin production of F. vesiculosus. However, there may be important indirect consequences. First, herbivory may be targeted more to apical parts of the thallus under eutrophicated conditions. Second, the result that Fucus growing close to nutrient sources were smaller than those in control areas may reflect differences in mortality schedules of algae between eutrophicated and control areas.

Keywords

Eutrophication Fish farming Fucus vesiculosus Herbivory Idotea baltica Phlorotannins 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Anne Hemmi
    • 1
  • Anita Mäkinen
    • 1
  • Veijo Jormalainen
    • 1
  • Tuija Honkanen
    • 1
  1. 1.Section of Ecology, Department of BiologyUniversity of TurkuTurkuFinland

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