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Analysis of demersal fish assemblages off the Southern Tyrrhenian Sea (central Mediterranean)

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Abstract

Monitoring and management of Mediterranean trawling requires a multispecies and ecosystem-based approach. Over the last 20 years studies on diversity and distribution of fish communities have been carried out by ecologists and applied to different ecosystems. Until now, very little information has been available on the Southern Tyrrhenian Sea. The aim of this work is: to analyse the structure of fish demersal assemblages, on a temporal (10 years) and spatial scale using a multivariate approach; to analyse, across space and time, the pattern of biodiversity by means of univariate indices; to identify areas supporting high values of diversity and evenness by a Geographical Information System (GIS) method. The analysis of 249 hauls from ten trawl surveys carried out between depths of 30 and 750 m in the South Tyrrhenian Sea yielded a total of 164 fish species. Multidimensional scaling ordination showed four groups distributed according to the depth gradient: a coastal group (0–100 m depth), a group in the lower part of the continental shelf (101–200 m), an epibathyal group (201–500 m) and the last one derived from hauls made in the middleslope (501–800 m). There were no differences, between years, protected and unprotected areas and geographical sectors. The whole study area was characterised by diversity values which were quite heterogeneous. The persistence index was generally low. Results could be useful from an ecological point of view and for the management of fishery activities.

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Acknowledgements

This paper is a result of the MEDITS Project. We are grateful to all the participants at the cruises as well as to the captain and crew of the trawler “Pasquale e Cristina” for their help during the sampling.

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Authors and Affiliations

  1. Institute for Coastal Marine Environment (IAMC)-National Research Council (CNR), Spianata S. Raineri, 86, 98122, Messina, Italy

    B. Busalacchi, P. Rinelli, A. Profeta, F. Perdichizzi & T. Bottari

  2. Department of Animal Biology and Ecology, University of Messina, Salita Sperone, 31, 98166, Messina, Italy

    F. De Domenico

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  1. B. Busalacchi
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  2. P. Rinelli
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  3. F. De Domenico
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Correspondence to T. Bottari.

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Handling editor: Sigrún Huld Jónasdóttir

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Busalacchi, B., Rinelli, P., De Domenico, F. et al. Analysis of demersal fish assemblages off the Southern Tyrrhenian Sea (central Mediterranean). Hydrobiologia 654, 111–124 (2010). https://doi.org/10.1007/s10750-010-0374-9

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