Resumen

CERVANTES-DUARTE, Rafael et al. Relevance of new and regenerated nitrogen sources in the water column of Magdalena Bay (SW Baja California Peninsula), Mexico. Rev. biol. mar. oceanogr. [online]. 2012, vol.47, n.3, pp.587-592. ISSN 0718-1957.  http://dx.doi.org/10.4067/S0718-19572012000300021.

Six bimonthly surveys during 2007 were carried out in Magdalena Bay (Mexico) during spring tide conditions. Spatiotemporal variations of temperature, salinity, nitrite, nitrate, ammonium, phosphate and chlorophyll-α were analyzed in the Bay. During spring-early summer (April-June) seawaters were colder and richer in new nutrients and chlorophyll-α than autumn and winter (February and October-December). The coastal upwelling during spring-early summer contributes with new nutrients to the Bay, whereas bottom-recycled nutrients should be the main input during the autumn-winter period. Thus, nutrients availability, dissolved inorganic nitrogen and phosphate, promote a seasonal pattern of phytoplankton biomass in Magdalena Bay.

Palabras clave : New nutrient; regenerated nutrient; chlorophyll-α; coastal upwelling.

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