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Susceptibility to grazing in different life cycle stages of the red alga Chondrus crispus

Conference paper
Authors Annelie Lindgren
Henrik Pavia
Per Åberg
Published in Proceedings of the 17th International Seaweed Symposium
Pages 349-356
ISBN 0 19 850742 9
Publication year 2003
Published at Department of Marine Ecology
Pages 349-356
Language en
Subject categories Marine ecology, Biological Sciences, Ecology


Grazing susceptibilities of gametophytic and tetrasporophytic fronds of Chondrus crispus Stack. from the Swedish west coast were examined in laboratory experiments. The overall consumption, irrespective of stage, as well as the feeding preference was tested on both adult and juvenile fronds. The mesoherbivores used in the experiments were the gastropods Littorina littorea, Lacuna vincta and the crustaceans Idotea granulosa and Gammarus locusta, since they are among the most abundant herbivore species within and among C. crispus stands in the study area. The results showed that all four mesoherbivore species were capable of consuming both adult and juvenile tissue. However, none of the herbivores showed a significant pref­ erence for a specific stage of adult fronds. For juvenile fronds, it was found that I. granulosa significantly preferred gametophytes to tetrasporophytes and there was a tendency for L. littorea to consume more of juvenile tetrasporophytes than gametophytes. This suggests that grazing could have an influence on the ploidy ratio of C. crispus.

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