, Volume 50, Issue 1, pp 13–17 | Cite as

Carbonate bioformations around underwater freshwater springs in the north-eastern Adriatic Sea

  • Silvia CocitoEmail author
  • Maja Novosel
  • Anđelko Novosel
Original Article


Large carbonate, bryozoan-serpulid constructions, made by Pentapora fascialis and Salmacina dysteri respectively, were found around karstic freshwater springs, called vruljas, in the Senj Archipelago (Velebit Channel, Croatia). In June 2002, several sites were investigated by SCUBA divers on the rocky cliffs of Grmac and Ždralova at depths ranging from 19 to 32 m. Mean colony diameter decreased with increasing distance from the vruljas: in the vicinity the mean diameter was 65.8±21 cm, at 2-m distance it was 40.4±8.2. Carbonate contribution was to a great extent due to the bryozoan (5,784±1,186 g⋅m−2 CaCO3) rather than to the serpulid (383±218 g⋅m−2 CaCO3). P. fascialis carbonate standing stock was remarkably high if compared with data from literature for shallow carbonate producers. The bryozoan-serpulid constructions can be indicated as important, even if localised, contributions to the carbonate budget in the Adriatic Sea.


Bryozoan-serpulid constructions Karst Freshwater springs ( vruljasNE-Adriatic 



Thanks to S. Sgorbini and A. Peirano (La Spezia) for the fieldwork and image processing. This work has been done within the framework of the Project Ambiente Mediterraneo (Accordo di Programma CNR-MIUR, L. 95/95).


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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.ENEA Marine Environment Research CentreLa SpeziaItaly
  2. 2.Department of BiologyFaculty of ScienceZagrebCroatia
  3. 3.Institute of GeologyZagrebCroatia

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