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8 páginas, 4 figuras, 1 tabla., Differences in reproductive investment can trigger asymmetric, context-dependent, functional strategies between genders in dioecious species. However, little is known about the gender responses of dioecious species to nutrient availability. We experimentally fertirrigated a set of male and female Juniperus thurifera trees monthly for 2 yr. Water potential, photosynthesis rate and stomatal conductance were measured monthly for 2 yr, while shoot nitrogen (N) concentration, carbon isotopic composition (d13C), branch growth, trunk radial growth and reproductive investment per branch were measured yearly. Control males had lower gas exchange rates and radial growth but greater reproductive investment and higher water use efficiency (WUE; as inferred from more positive d13C values) than females. Fertirrigation did not affect water potential or WUE but genders responded differently to increased nutrient availability. The two genders similarly increased shoot N concentration when fertilized. The increase in shoot N was associated with increased photosynthesis in males but not in females, which presented consistently high photosynthetic rates across treatments. Our results suggest that genders invest N surplus in different functions, with females presenting a long-term strategy by increasing N storage to compensate for massive reproductive masting events, while males seem to be more reactive to current nutrient availability, promoting gas-exchange capacity., The authors wish to thank, in particular, Anna Sala and her lab staff for their valuable ideas on the interpretation of our data. Thanks also to Tono Bellido and Jorge Selle´s for their help with field and lab work. Many thanks also to the entire Puebla de San Miguel staff and especially to Luı´s María Alcusa and Jesus Monedero for their support. The research was funded by the Spanish Ministerio de Educación y Ciencia (AGL2001-1061 and AGL2011-24296) and The Madrid Regional Government (S2009AMB-1783 REMEDINAL 2). D.M. is grateful to have received an FPI grant from MEC (BES-2002-1828). AEMet kindly provided meteorological data free of charge.