Marine Biology

, Volume 147, Issue 6, pp 1261–1270 | Cite as

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

  • G. Di CarloEmail author
  • F. Badalamenti
  • A. C. Jensen
  • E. W. Koch
  • S. Riggio
Research Article


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.


Control Location Crest Seagrass Meadow Sediment Thickness Shoot Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



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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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • G. Di Carlo
    • 1
    Email author
  • F. Badalamenti
    • 2
  • A. C. Jensen
    • 1
  • E. W. Koch
    • 3
  • S. Riggio
    • 4
  1. 1.School of Ocean and Earth ScienceSouthampton Oceanography CentreSouthamptonUK
  2. 2.Laboratorio di Ecologia MarinaIAMC-CNRCastellammare del Golfo (TP)Italy
  3. 3.University of Maryland Center for Environmental Science, Horn Point LabCambridgeUSA
  4. 4.Dipartimento di Biologia AnimaleUniversità di PalermoPalermoItaly

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