Geostatistical analysis of densities of Liocarcinus
depurator (Brachyura: Portunidae) on the western Mediterranean from 1994 to 2003 |
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Authors: | Marta M Rufino Francesc Maynou Pere Abelló Andrew B Yule Luis Gil de Sola |
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Institution: | (1) CripSul, Ipimar, Av. 5 Outubro, s/n, 8700-305 Olhão, Portugal;(2) Institut de Ciències del Mar (CSIC), Pg. Marítim de la Barceloneta, 37-49, 08003 Barcelona, Spain;(3) Schoool of Ocean Sciences, University of Wales—Bangor, LL59 5EY Gwynedd, UK;(4) Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Muelle Pesquero s/n, Apdo.285, 29640 Fuengirola (Málaga), Spain |
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Abstract: | Bottom trawl estimates of densities of the portunid crab Liocarcinus depurator along the Mediterranean coast of Spain from 1994 to 2003, covering a depth range of 50–800 m, were analysed using non-linear geostatistical techniques. The variation of the spatial distribution was modelled through variogram analysis using depth as a covariate. Patch size ranged from 20 to 75 km. Crab density showed a general decrease from 1994 to 2003. L. depurator high-density areas were characterised as either occasional or permanent (always present every year). High-density patches appeared to be associated with either upwelling or strong river influence, i.e. the Western Alborán Sea and the Ebro Delta. The application of non-linear geostatistical techniques proved useful in identifying permanent high-density population patches, thereby highlighting regions of special interest for the ecology of the species. |
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