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Coastal ecosystems of Lomas are constituted by plant communities developing under winter fog influences. In order to explore this issue we determined the relationship between vegetation dynamics and meteorological conditions at Atiquipa Lomas, Barrera and Lagunillas hills (15°46′ LS y 74°22′ LW, 800 m.a.s.l. aprox.) from February 2005 to February 2006. Forty-five 0,5×0,5 m plots were installed in each hill, with monthly plot evaluations of species number, individuals per species (seedlings and adults), species cover, fallen leaves cover and phenological status. Simpson and Shannon-Wiener indexes were calculated. Natural precipitation, fog collection and medium temperature were also monthly registered. With these data we ran lineal correlations between environment parameters (3) and vegetation (10). Several significant relationships (p<0.05) were found, fog had 5 significant relationships: direct …