Abstract
G.W. Scott and S. Marsham. 2006. Can juvenile Fucus (Phaeophyta) really deter grazing by Littorina littorea (Mollusca)? Phycologia 45: 158–160. DOI: 10.2216/04-102.1Grazing by herbivores has been shown to induce chemical defences in algae. To investigate the possibilities that these chemical defences are a property of the plant or of the water surrounding the plant we assigned Littorina littorea to one of four experimental treatments and measured the amount of alga consumed. We also used the results to determine if juvenile Fucus sp. can deter grazing by snails. Our results show that previously grazed plants are just as palatable as ungrazed plants and chemical deterrents do not seem to accumulate in the seawater surrounding the plant. We suggest that juvenile Fucus sp. plants do not produce chemicals that effectively deter the herbivore.
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