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Geostatistical analysis of densities of Liocarcinus depurator (Brachyura: Portunidae) on the western Mediterranean from 1994 to 2003

AuthorsRufino, Marta M. ; Maynou, Francesc ; Abelló, Pere ; Yule, Andrew B.; Gil de Sola, Luis
Issue DateJul-2006
CitationMarine Biology 149(4): 855-864 (2006)
AbstractBottom 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.
Description10 pages, 4 figures, 2 tables
Publisher version (URL)http://dx.doi.org/10.1007/s00227-006-0253-0
Appears in Collections:(ICM) Artículos
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