Andrew B. Yule

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The small-scale spatial distribution of density and biomass of the crab Liocarcinus depurator off the Ebro delta was analysed using universal kriging (non-linear geostatistics), considering depth as an external trend. In order to understand the spatial distribution of crab size, a third variable was created from the residuals of the non-linear regression(More)
The patterns of occurrence and density of Liocarcinus depurator along the western Mediterranean coast (from Gibraltar to Cape Creus) were measured at depths between 25 and 800 m. Bottom trawl surveys were carried out from 1994 to 2003. For analysis, the area was divided into eight geographic sectors and eight depth intervals. The highest crab occurrences(More)
The pedunculated cirripedePollicipes pollicipes is of considerable economic importance in Portugal, particularly along the southwest coast. Current knowledge of its biology is poor, as evidenced by the paucity of available literature. This paper reports on the reproduction of twoP. pollicipes populations, Castelejo and Zavial, on the southwest coast of the(More)
The ingestion, fecundity, growth rates and culture of theharpacticoid copepod, Tisbe furcata, fed different algalspecies at different cell densities were studied. It was foundthat Tisbe furcata initiated feeding at an algalconcentration of 2.5 cells μl−1 for Rhinomonasreticulata and 8 cells μl−1 for Skeletonemacostatum but a higher concentration of 30 cells(More)
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