Scientia Marina, Vol 83, No S1 (2019)

Long-term spatiotemporal dynamics of cephalopod assemblages in the Mediterranean Sea


https://doi.org/10.3989/scimar.04841.20A

Antoni Quetglas
Instituto Español de Oceanografía (IEO), Centre Oceanogràfic de Balears, Spain
orcid http://orcid.org/0000-0002-1303-8003

Maria Valls
Instituto Español de Oceanografía (IEO), Centre Oceanogràfic de Balears, Spain
orcid http://orcid.org/0000-0001-9070-8181

Francesca Capezzuto
Dipartimento di Biologia, Università di Bari Aldo Moro, Italy
orcid http://orcid.org/0000-0002-1498-0228

Loredana Casciaro
COISPA-Tecnologia & Ricerca, Italy
orcid http://orcid.org/0000-0003-4876-9874

Danila Cuccu
Dipartemento di Scienze della Vita e dell’Ambiente, Università di Cagliari, Italy
orcid http://orcid.org/0000-0001-5638-8209

María González
IEO-Centro Oceanográfico de Málaga - Universidad de Málaga, Departamento de Biología Animal, Spain
orcid http://orcid.org/0000-0003-4248-1765

Zdravko Ikica
Institute of Marine Biology, University of Montenegro, Montenegro
orcid http://orcid.org/0000-0003-3157-0500

Svjetlana Krstulović Šifner
University Department of Marine Studies, University of Split (UNIST), Croatia
orcid http://orcid.org/0000-0002-0607-6466

Valentina Lauria
Instituto per l’Ambiente Marino Costiero, IAMC-CNR, Italy
orcid http://orcid.org/0000-0002-4179-9133

Evgenia Lefkaditou
HCMR, Hellenic Centre of Marine Research, Greece
orcid http://orcid.org/0000-0002-7868-5375

Panagiota Peristeraki
HCMR, Hellenic Centre of Marine Research - Biology Department, University of Crete, Greece
orcid http://orcid.org/0000-0002-8608-078X

Corrado Piccinetti
Laboratorio di Biologia Marina e Pesca, Università di Bologna, Italy
orcid http://orcid.org/0000-0002-4928-4353

Pavlos Vidoris
Hellenic Agricultural Organization DEMETER, Fisheries Research Institute, Greece
orcid http://orcid.org/0000-0002-5298-2136

Stefanie Keller
Instituto Español de Oceanografía (IEO), Centre Oceanogràfic de Balears, Spain
orcid http://orcid.org/0000-0003-4826-9511

Abstract


The Mediterranean Sea shows a trend of increasing temperature and decreasing productivity from the western to the eastern basin. In this work we investigate whether this trend is reflected in the cephalopod assemblages found throughout the Mediterranean. Data obtained with bottom trawl surveys carried out during the last 22 years by EU Mediterranean countries were used. In addition to analysing spatial differences in cephalopod assemblages, we also analysed putative temporal changes during the last two decades. For this purpose, the basin was spatially divided into bioregions, the trawling grounds were subdivided into depth strata, and the dataset was split into two time series of 11 years each. All analyses were done using PRIMER software. The species richness did not vary with the longitudinal gradient, though in most bioregions it showed a mild decrease with depth before plummeting in the deepest waters. Cluster analysis revealed four different bathymetric assemblages in all bioregions. Despite the contrasting conditions between basins and the claims of biodiversity loss, our study revealed that spatial and temporal differences during the last two decades were restricted to changes in the relative abundance of species from a common pool of species inhabiting the whole Mediterranean.

Keywords


monitoring; bottom trawling; biodiversity; biogeography; dominant species; continental shelf; continental slope

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