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This research was supported by the national project "Caracterizacion y modelizacion de los patrones de variacion espacial y temporal de las comunidades costeras de Asturias" (CTM 2006-05588). I am grateful to Dr. R. Anadon for the use and information on his historical data. I also thank Dr. J. Arrontes for advice on data analysis and Dr. J.M. Rico for linguistic assistance. I also appreciate the critical review by anonymous referees