Abstract
Phenotypic plasticity could be a key mechanism of successful species invasion. Few studies, however, have evaluated whether a non-indigenous species induces anti-herbivore defenses after its introduction to new habitats. We tested how a non-indigenous (Mastocarpus stellatus) and a native red seaweed (Chondrus crispus) responded to grazing by a periwinkle (Littorina littorea) and an isopod (Idotea granulosa) in Helgoland, Germany. In the donor region of the Mastocarpus population, that is Iceland, the periwinkle is missing, whereas the isopod is present. Our results indicate that Mastocarpus experienced less consumption by Littorina (but not by Idotea) than Chondrus. Moreover, Mastocarpus induced defenses in response to Idotea (but not to Littorina) grazing, whereas Chondrus induced anti-herbivory responses to both species of herbivores. Grazed Mastocarpus grew equally to non-grazed conspecifics, while growth of grazed Chondrus was lower than of ungrazed conspecifics. Hence, the non-indigenous Mastocarpus responded differently to grazing stress than the native Chondrus with respect to anti-herbivory and compensatory responses, which perhaps supported the successful Mastocarpus establishment in a new range.
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Acknowledgments
We thank Andreas Wagner, Annekathrin Enge, and Susanne Wollgast for assistance in setting up experiments and Nelson Valdivia for assistance in the field. We are grateful to Maria B. Steinarsdόttir for providing M. stellatus samples from Iceland.
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Communicated by F. Bulleri.
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Yun, H.Y., Molis, M. Comparing the ability of a non-indigenous and a native seaweed to induce anti-herbivory defenses. Mar Biol 159, 1475–1484 (2012). https://doi.org/10.1007/s00227-012-1926-5
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DOI: https://doi.org/10.1007/s00227-012-1926-5