Las macroalgas son organismos dominantes en cobertura y biomasa en mares fríos y templados de las costas rocosas de todo el mundo. La sobreexplotación del recurso pone en riesgo dos aspectos muy importantes: 1) se está permitiendo que no haya una renovación apropiada de las praderas naturales y 2) se estaría afectando a las comunidades del macrobentos. En este sentido el presente trabajo determinó el efecto de la extracción de Lessonia trabeculata sobre la riqueza y abundancia del macrobentos asociado a esta alga en Marcona. Se realizó un muestreo en 02 sectores (Lobo Fino y Basural), en cada uno de los cuales se ubicaron 03 transectos con 03 estaciones (replicas), distribuidos en intervalos de profundidad de: 5-10 m, 10-15 m y 15-20 m, obteniendo en total 18 discos de adhesión y 9 interdisco. Se registraron un total de 5399 organismos agrupados en 71 especies distintas, identificándose 5369, correspondiendo 31 especies al Phylum Anélida, 17 a Mollusca, 15 a Crustácea, 4 a Equinodermata, 1 a Tunicata, 1 a Nemertea, 1 a Picnogónida y 1 a la Ictofauna del sector. La Riqueza de especies (S) en las muestras intradisco varió entre 13 y 37 siendo las subestaciones P.3.2 y P.3.3 en Lobo Fino con valores más altos, mientras en las muestras interdisco la S evidenciada varía de 8 a 24, con el mayor registro en la estación I.4 del Basural. El análisis de clúster realizado con el PRIMER 6.0 nos da como resultado que entre las subestaciones de El Basural existe una similaridad del 61% siendo la subestación B.4.3 la que se diferencia en un solo grupo por la mayor S de poliquetos y entre las subestaciones de Lobo Fino a un 62% las subestaciones L.1.1 y L.1.2 forman grupos separados por las diferencias existentes en la diversidad de moluscos y crustáceos. ABSTRACT Macroalgae are dominant organisms in cover and biomass in cold and temperate seas of the rocky shores worldwide. The overexploitation of the resource endangers two important aspects: 1) it is allowing no proper renewal of natural pastures and 2) be affecting macrobenthic communities. The aim of this work was determined the effect of the removal Lessonia trabeculata on the richness and abundance of macrobenthos associated to algae in Marcona. Sampling in 02 sectors (Lobo Fino and Basural), in each 03 transects with 03 stations distributed in depth intervals were located was performed: 5-10 m, 10-15 m and 15-20 m, obtaining a total of 18 holdfasts as samples and 9 between disk. A total of 5399 organisms grouped in 71 different species were recorded, identifying 5369, corresponding to 31 species of Phylum Annelida, 17 to Mollusca, 15 to Crustacea, 4 to Equinodermata, 1 to Tunicata, 1 to Nemertea, 1 to the Pycnogonida and 1 to the ichthyofauna of the sector. The species richness (S) on the discs varied between 13 and 37 being the P.3.2 and P.3.3 substations of Lobo Fino with higher values, while among the S evidenced between disks varies from 8 to 24, with higher registration of I.4 station of Basural. The cluster analysis performed with PRIMER 6.0 gives us the result that between the substations of Basural exists a similarity of 61% being B.4.3 substation which differs in one group the highest species richness of polychaetes and between substations of Lobo Fino to 62% L.1.1 and L.1.2 substations are separated by differences in diversity of molluscs and crustaceans.
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