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Population dynamics and life cycle of the introduced ascidian Microcosmus squamiger in the Mediterranean Sea

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Abstract

Marine introductions are a serious threat for biodiversity, especially in seas where shipping is intensive. Microcosmus squamiger is a widespread marine invader that can alter native biota and it is therefore imperative to understand its biology and ecology. We studied the population dynamics and reproductive cycles of M. squamiger over a 2-year period, as well as its settlement and colonization patterns, in a north-western Mediterranean (NE Spain) locality where M. squamiger has been introduced. All biological parameters showed a strong seasonal pattern that peaked in summer with a major spawning episode at the end of summer. Size-frequency histograms indicated a 2-year cycle. Colonization experiments suggested that M. squamiger recruitment mortality is high and requires a well structured community. In addition, we monitored the abundance of the native predator Thais haemastoma, which showed a significant positive correlation with M. squamiger biomass, indicating its potential usefulness as a biological control.

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Acknowledgements

We are grateful to A. Bucci and I. Calderón for assistance in the field. We thank P.A. Maíllo and M. Durfort for their help with the histological procedures. This study was funded by project CTM2007-66635 of the Spanish Government.

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Authors and Affiliations

  1. Departament de Biologia Animal (Invertebrats), Facultat de Biologia, Universitat de Barcelona, Avinguda Diagonal 645, 08028, Barcelona, Spain

    Marc Rius & Mari Carmen Pineda

  2. Centre d’Estudis Avançats de Blanes (CEAB, CSIC), Accés a la Cala S. Francesc, 14, 17300, Blanes (Girona), Spain

    Xavier Turon

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  1. Marc Rius
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Correspondence to Xavier Turon.

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Rius, M., Pineda, M.C. & Turon, X. Population dynamics and life cycle of the introduced ascidian Microcosmus squamiger in the Mediterranean Sea. Biol Invasions 11, 2181–2194 (2009). https://doi.org/10.1007/s10530-008-9375-2

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