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Underwater observations on fish and asteroid consumers (i.e. predators and scavengers) of sea urchins, Paracentrotus lividus and Arbacia lixula, were carried out at several locations in shallow Mediterranean rocky reefs. Observations conducted in the marine reserve of Torre Guaceto (Adriatic Sea) revealed that sparid fishes, Diplodus sargus and D. vulgaris, are the main fish predators of small (<1 cm...
The effects of the sea urchin Paracentrotus lividus (Lamarck) fishery, and possible indirect influences on the co-occurring (but not harvested) sea urchin Arbacia lixula (L.), were investigated in shallow rocky reefs in southern Apulia (SE Italy, Mediterranean Sea). Density, size (test diameter), biomass and size-frequencies of both species were assessed in summer 2001 at one location heavily impacted...
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