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Uptake and regeneration of nitrogen in the Almeria-Oran frontal zone (SW Mediterranean) and adjacent (Atlantic and Mediterranean) systems were studied during the Almofront I cruise (JGOFS-France). The frontal zone was characterized by an upsloping of nitracline from about 50m in the adjacent systems to 25-30m within. Along with nitrate, ammonium, chlorophyll a and particulate organic nitrogen also...