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11 p.-2 fig.-4 tab.[EN]The Mediterranean fruit fly, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae), is considered one of the most economically damaging pests of citrus orchards in Spain. The characterization of C. capitata population structure, at a large geographical scale, by using a combination of RAPD and ISSR markers can allow analyzing the genetic variability of this species, and provide some insight in decision making for resistance management, recently recorded in\udSpain. We compared six Spanish populations along the Mediterranean area (Gerona, Amposta, Tortosa, Castellón, Valencia and Málaga) with populations from other geographical areas where this pest is widely distributed (Africa, Middle East, South America and Atlantic Islands) and two laboratory strains. The results obtained with both types of molecular markers were similar. A dendrogram based on Nei genetic distances showed that all Mediterranean Spanish populations, except the population collected in Gerona, were clearly separated from the rest. However, no clear differentiation among Spanish populations was found, probably as a result of the high levels of gene flow (Nm value of 2.8 for RAPD and 3.9 for ISSR). Implications of these findings on resistance management of C. capitata are discussed.[ES]La mosca mediterránea de la fruta, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae), está considerada como una de las plagas económicamente más perjudiciales de los cultivos de cítricos en España. La caracterización de la estructura poblacional de C. capitata, a gran escala, mediante el uso conjunto de marcadores RAPD e ISSR puede\udpermitir analizar la variabilidad genética de esta especie, y proporcionar alguna información en la toma de decisiones del manejo de la resistencia, registrada recientemente en España. Se compararon seis poblaciones españolas del área mediterránea (Gerona, Amposta, Tortosa,Castellón,Valencia y Málaga) con poblaciones de otras zonas geográficas donde esta plaga está ampliamente distribuida (África, Oriente Medio, América del Sur e Islas del Atlántico) y dos líneas de laboratorio. Los resultados obtenidos con ambos tipos de marcadores moleculares fueron similares. Un dendrograma basado en las distancias genéticas de Nei mostró que todas las poblaciones mediterráneas españolas, a excepción de la población recogida en Gerona, estaban claramente separadas del resto. Sin embargo, no se encontró una\uddiferenciación clara entre las poblaciones españolas, probablemente como resultado de los altos niveles de flujo génico (un valor de Nm de 2,8 para RAPD y 3,9 para ISSR). Se discuten las implicaciones de estos resultados en el manejo de la resistencia de C. capitata.This work was supported by INIA (Grant RTA03-\ud103-C6-2).Peer reviewe

Genetic structure of Spanish populations of Ceratitis capitata revealed by RAPD and ISSR markers: implications for resistance management