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Effects of Endolithic Parasitism on Invasive and Indigenous Mussels in a Variable Physical Environment

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  • Gerardo Ivan Zardi
  • Katy Rebecca Nicastro
  • Christopher David McQuaid
  • Marcos Gektidis

Abstract

Biotic stress may operate in concert with physical environmental conditions to limit or facilitate invasion processes while altering competitive interactions between invaders and native species. Here, we examine how endolithic parasitism of an invasive and an indigenous mussel species acts in synergy with abiotic conditions of the habitat. Our results show that the invasive Mytilus galloprovincialis is more infested than the native Perna perna and this difference is probably due to the greater thickness of the protective outer-layer of the shell of the indigenous species. Higher abrasion due to waves on the open coast could account for dissimilarities in degree of infestation between bays and the more wave-exposed open coast. Also micro-scale variations of light affected the level of endolithic parasitism, which was more intense at non-shaded sites. The higher levels of endolithic parasitism in Mytilus mirrored greater mortality rates attributed to parasitism in this species. Condition index, attachment strength and shell strength of both species were negatively affected by the parasites suggesting an energy trade-off between the need to repair the damaged shell and the other physiological parameters. We suggest that, because it has a lower attachment strength and a thinner shell, the invasiveness of M. galloprovincialis will be limited at sun and wave exposed locations where endolithic activity, shell scouring and risk of dislodgement are high. These results underline the crucial role of physical environment in regulating biotic stress, and how these physical-biological interactions may explain site-to-site variability of competitive balances between invasive and indigenous species.

Suggested Citation

  • Gerardo Ivan Zardi & Katy Rebecca Nicastro & Christopher David McQuaid & Marcos Gektidis, 2009. "Effects of Endolithic Parasitism on Invasive and Indigenous Mussels in a Variable Physical Environment," PLOS ONE, Public Library of Science, vol. 4(8), pages 1-10, August.
  • Handle: RePEc:plo:pone00:0006560
    DOI: 10.1371/journal.pone.0006560
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    References listed on IDEAS

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    1. Mark E. Torchin & Kevin D. Lafferty & Andrew P. Dobson & Valerie J. McKenzie & Armand M. Kuris, 2003. "Introduced species and their missing parasites," Nature, Nature, vol. 421(6923), pages 628-630, February.
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