Scientia Marina, Vol 66, No S2 (2002)

Analysis of demersal fish assemblages of the Tuscany and Latium coasts (north-western Mediterranean)


https://doi.org/10.3989/scimar.2002.66s2233

Franco Biagi
Dipartimento di Scienze dell’Uomo e dell’Ambiente, Università di Pisa, Italy

Paolo Sartor
Centro Interuniversitario di Biologia Marina ed Ecologia Applicata, Italy

Gian Domenico Ardizzone
Dipartimento di Biologia Animale e dell’Uomo, Università di Roma “La Sapienza”, Italy

Paola Belcari
Dipartimento di Scienze dell’Uomo e dell’Ambiente, Università di Pisa, Italy

Andrea Belluscio
Dipartimento di Biologia Animale e dell’Uomo, Università di Roma “La Sapienza”, Italy

Fabrizio Serena
Agenzia Regionale per l’Ambiente Toscana, Spain

Abstract


A four-year time series (1994-1997) of groundfish trawl surveys performed within the European Union Project MEDITS (Mediterranean International Trawl Surveys), was analysed to identify and describe the fish assemblages along the continental shelf and slope of Tuscany and Latium (Italy), in the north-western Mediterranean. Cluster analysis was used to group samples with similar species composition in terms of abundance, biomass and frequency of occurrence. Results allowed the identification of four to five broad assemblages along the depth gradient: a strictly coastal group (< 50 m depth), two groups in the upper and lower part of the continental shelf (essentially 50-200 m), an epibathyal group (200-450 m) and a group derived from hauls made at depths greater than 450 m. Each assemblage corresponded to a faunistic association with relatively homogeneous and persistent species composition, biomass and density indices.

Keywords


assemblages; cluster analysis; demersal resources; western Mediterranean

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