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Sala E, Garrabou J, Coma R, Alva V, Zabala M, Hereu B, Ribes M.? 1998.??emporal variability in abundance of the sea urchins Paracentrotus lividus and Arbacia lixula in the northwestern Mediterranean: comparison between a marine reserve and an unprotected area. Marine Ecology Progress Series. 168\par \par }