Abstract
The invasive red alga Gracilaria vermiculophylla has quickly spread across Europe, but it is unclear whether its success is based on a high tolerance to variations in environmental conditions or to the absence of native grazers that feed on this alga. We tested whether native invertebrate grazers prefer native algae to G. vermiculophylla. Feeding preferences of three common herbivores were quantified when offered G. vermiculophylla and native Fucus vesiculosus, Ceramium virgatum, and Ulva intestinalis in no-, two- and multiple-choice trials. Herbivore growth was measured when fed each of the algae separately. Grazers consumed G. vermiculophylla in no-choice trials, but avoided generally this alga when having a choice. U. intestinalis was always preferred over G. vermiculophylla, and grazers fed with U. intestinalis grew faster than those fed with G. vermiculophylla. We conclude that grazers avoid G. vermiculophylla to most native algae, which may benefit G. vermiculophylla in northern European estuaries.
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Acknowledgments
PhD-student Lars B. Nejrup was supported by a grant number 272-05-0161 (CIPE) while Morten F. Pedersen and Jonas Vinzent were supported by grant #272-08-0577 (MARINVA) from the Danish Natural Sciences Research Council. We like to thank Gary T. Banta for statistical advice and two anonymous referees for providing helpful and constructive comments to the initial version of the manuscript.
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Communicated by F. Bulleri.
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Nejrup, L.B., Pedersen, M.F. & Vinzent, J. Grazer avoidance may explain the invasiveness of the red alga Gracilaria vermiculophylla in Scandinavian waters. Mar Biol 159, 1703–1712 (2012). https://doi.org/10.1007/s00227-012-1959-9
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DOI: https://doi.org/10.1007/s00227-012-1959-9