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Colonisation process of vegetative fragments of Posidonia oceanica (L.) Delile on rubble mounds

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Abstract

Seagrass colonise new areas via the dispersion of seeds or vegetative fragments. Independent of the manner of colonization, habitat requirements need to be met for the successful establishment of seagrasses. Here we report on the colonization process of Posidonia oceanica in a highly disturbed area: a gas pipeline trench at Capo Feto (SW Sicily, Italy). A trench dredged through a P. oceanica bed was back-filled with rubble added from dump barges leading to the formation of a series of rubble mounds on the seabed. Over time, these mounds became colonised with P. oceanica. I>. In order to understand the pattern of P. oceanica colonization, shoot density was quantified over 3 years (2001–2003) on different mound locations (crests, sides, valleys). Seagrass coalescence was observed only in valleys between mounds where shoot density averaged 133±50 shoots m−2, while values for sides and crests were significantly lower (30.5±14 and 5.8±2.6 shoots m−2, respectively). Although sediment accumulated on both crests and valleys, a significantly thicker sediment layer was recorded in the valleys (9.8±0.4 cm) than on crests (1.1±0.2). Plaster dissolution rate (an indicator of the hydrodynamic regime) tended to decrease from crests to valleys but even in the valleys, the currents were still higher than in the adjacent vegetated control location. This pattern was constant over time and depths. This is the first study to report on P. oceanica vegetative recruitment on artificial rubble after a disturbance event. It appears that the valleys between the rubble mounds are suitable for seagrass recruitment as sediment deposited between the rubble provides the necessary resources for plant settlement and growth. Once the seagrass patches are established, they may start a positive feedback of attenuation of currents, sediment accumulation and seagrass patch expansion.

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Acknowledgements

The authors kindly thank TMPC (Trans-Mediterranean Pipeline Company Ltd) for the co-operation to realise this study. We also wish to acknowledge G Albano (Mariconsult), M Gristina, T Vega Fernandez, M Bascone for help during field work.

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Authors and Affiliations

  1. School of Ocean and Earth Science, Southampton Oceanography Centre, European Way, Southampton, SO14 3ZH, UK

    G. Di Carlo & A. C. Jensen

  2. Laboratorio di Ecologia Marina, IAMC-CNR, Via G. da Verrazzano 17, 91014, Castellammare del Golfo (TP), Italy

    F. Badalamenti

  3. University of Maryland Center for Environmental Science, Horn Point Lab, P.O. Box 775, Cambridge, MD, 21613, USA

    E. W. Koch

  4. Dipartimento di Biologia Animale, Università di Palermo, Via Archirafi 18, 90123, Palermo, Italy

    S. Riggio

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  1. G. Di Carlo
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  2. F. Badalamenti
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  4. E. W. Koch
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  5. S. Riggio
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Correspondence to G. Di Carlo.

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Communicated by R. Cattaneo-Vietti, Genova

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Di Carlo, G., Badalamenti, F., Jensen, A.C. et al. Colonisation process of vegetative fragments of Posidonia oceanica (L.) Delile on rubble mounds. Marine Biology 147, 1261–1270 (2005). https://doi.org/10.1007/s00227-005-0035-0

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