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We assessed the effectiveness of two marine reserves (MRs) in the Canary Islands (eastern Atlantic), called \u22Punta La Restinga-Mar de Las Calmas\u22 (El Hierro Island) and \u22Isla La Graciosa e islotes del norte de Lanzarote\u22 (Chinijo Archipelago). Specifically, we evaluated the variability in the abundances and biomasses of four commercially-targeted fish species: the parrotfish (Sparisoma cretense), the island grouper (Mycteroperca fusca), the white sea-bream (Diplodus sargus cadenati) and the zebra sea-bream Diplodus cervinus cervinus) Four fishing managemente categories were established within and around each MR: (1) a no-take or integral area (collection of all animals is nor permitted), (2) a buffer area (fishing is permitted with traditional fishing gears, (3) a neighbouring fishing area (\u3c20 \u3ekm), and (4) a fishing area off a neighbouring island. Two randomly selected sites were sampled within each management category and MR in October and March 2004. Univariate tests provided evidence of a moderate \u22reserve effect\u22 for both MRs consistent through time. Differences in abundances and biomasses of each species among management categories were clearly species-specific and inconsistent between both MRs. Species of the genus Diplodus showed greater abundances and biomasses within protected locations compared to unprotected locations at El Hierro Island. Moreover, the four selected species showed greater abundances and biomasses in the locations surveyed at El Hierro Island compared to unprotected locations at the neighbouring island. In contrast, S. cretense appeared to be the only species that benefited from protection in the Chinijo MR. Differences in the sizes of the MRs, the fishing effort around the MRs and the effectiveness of the enforcement withing each MR, appeared to be possible explanations for the patterns observed

Assessment of the effectiveness of two marine reserves in the Canary Islands (eastern Atlantic)