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Induction de défense contre l'herbivore Littorina littorea dans l'algue Fucus vesiculosus : influence des stimuli et variation géographique

Year: 2010
Type: article
Abstract: Induced defense against the herbivore Littorina littorea in the seaweed Fucus \nvesiculosus: influence of stimuli and geographic variation \n \n \nGrazing by marine herbivores can heavily impact macroalgae, which, in turn, reduce \nbiomass losses through induced resistances. Although this topic has been much studied in \nrecent years, there exists no information on this defense mechanism in the subarctic \nnorthwest Atlantic. We tested the macroalga Fucus vesiculosus for inducible resistances by \nvarious cues and for plasticity in the response to different grazing pressures. In laboratory, \nwe exposed seaweeds to artificial wounding (clipping) and to two densities of the gastropod \nLittorina littorea. We assessed whether algae had a decreased palatability every third day \nfor a period of 21 days. Defense was established upon a greater feeding rate of periwinkles \non ungrazed/unclipped (control) seaweeds vs. previously manipulated seaweeds in \nsubsequent choice feeding assays. Grazing by the two periwinkle densities caused a trend \nof resistance of similar intensity while artificial wounding significantly induced defense in \nseaweeds for 6 consecutive days. While we did not demonstrate a correlation of \nphlorotannin concentrations with the trend of decreased palatability nor defense flexibility \nfor the two grazing magnitudes, an inducible resistance in a macroalga is established for the \nfirst time in the subarctic northwest Atlantic. The few evidences where L. littorea grazing \ndoes not trigger a reduced palatability in F. vesiculosus from the northwest Atlantic hint for \na geographic variation with the Baltic Sea where it do es stimulate a resistance.
Language: French
Subfield: Oceanography
Open Access status: green
OpenAlex ID: W1520921677
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