Trezze San Pietro e Bardelli - Italy


The rocky outcrops known locally as trezze are characterized by substrates of various origins (clastic sedimentary, sedimentary sediments, organogenic) and with extensions ranging from a few to severa... hundred meters. The geological nature of the outcrops reveals that not all of them can be assimilated to bioconstructions, but there are also slabs deriving from the cementation of sand or rocks by methane gas. From recent investigations about 250 outcrops have been identified only in the Gulf of Trieste between Punta Sdobba and Punta Tagliamento; the most widespread range of these outcrops is on the seabed in front of the lagoons of Grado and Marano at a distance from the coastline of between 2 and 17 km, and a depth varying between 8.3 and 21.5 m. From the bibliography it emerges that the areas involved in rocky outcrops extend from the Gulf of Trieste to the coast of Ancona, along the entire northwestern and western coast of the North Adriatic. The calcareous concretions are attributable to Corallinaceous algae and secondly to Briozoa, Molluscs (Arca noae, Chama gryphoides), Anthozoans (Cladocora caespitosa), Serpulids (Serpula concharum, Serpula vermicularis, Pomatoceros triqueter, Rotula sp.plur.). The typology of the San Pietro and Bardelli trezze is of the Tabular type consisting of a fractioned set of many outcrops of the same type, however there are some major elements of larger dimensions.


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Information Resources

Adriatic sea: human uses and MSP-related layers

EMODnet Bathymetry

Target species - EurOBIS occurrences

Data Source
Copernicus Marine Service - Mediterranean Sea Physics Reanalysis


Data Source
I-STORMS Web System (IWS)

Conceptual models

For this site is available the target species conceptual model.

For this site is available the ecological processes conceptual model.


Information about the site is stored in DEIMS-SDR (Dynamic Ecological Information Management System - Site and dataset registry). Go to DEIMS-SDR page for Trezze San Pietro e Bardelli - Italy.

Last Update

May 12, 2021, 3:48 p.m.