Demersal cephalopod communities in the Mediterranean – a large scale analysis
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AuthorsKeller, S. (Stefanie); Hidalgo, M. (Manuel); Álvarez-Berastegui, D. (Diego); Bitetto, I. (Isabella); Casciaro, L. (Loredana); Cuccu, D. (Danila); Esteban-Acón, A. (Antonio); Garofalo, G. (Germana); González-Aguilar, M. (María); Guijarro, B. (Beatriz); Josephides, M. (Marios); Jadaud, A. (Angélique); Lefkaditou, E. (Eugenia); Maiorano, P. (Porzia); Manfredi, C. (Chiara); Marceta, B. (Bojan); Micallef, R. (Reno); Peristeraki, P. (Panagiota); Relini, G. (Giulio); Sartor, P. (Paolo); Spedicato, M.T. (Maria Teresa); Tserpes, G. (George); Quetglas, A. (Antoni)
Bottom trawl surveys
Cephalopod assemblages at the scale of the entire Mediterranean Sea were analysed using information from 2 decades of standardized scientific bottom trawl surveys. Western and eastern assemblages (6 yr of data) were compared using a combined approach of multivariate ordination techniques and non-linear regressions. These methods enabled us to distinguish assemblages and simultaneously analyse the influence of geographic, bathymetric and environmental (sea surface temperature and chlorophyll a concentration) gradients on observed community patterns. Despite few differences in species composition between sub-basins, the relative contribution of species differed. Bathymetry was the primary structural driver for the cephalopod communities of both basins, and contributed to 3 assemblages (shallow water, upper slope and middle slope). Winter temperature influenced community assemblages more strongly in the western than in the eastern basin, in contrast to a small but consistent winter produc ...