Rev. biol. mar. oceanogr. 47(3): 587-592

Nota Científica

Relevancia de fuentes nitrogenadas nuevas y regeneradas en la columna de agua en Bahía Magdalena (SO Península de Baja California), México

 Rafael Cervantes-Duarte^1,2, Silverio López-López¹, Fernando Aguirre-Bahena¹,

Eduardo González-Rodríguez³ & Sonia Futema-Jiménez¹

¹Centro Interdisciplinario de Ciencias Marinas, CICIMAR-IPN, Av. Instituto Politécnico Nacional, s/n Col. Playa Palo de Santa Rita, A.P. 592, La Paz, BCS, México. C.P. 23096. Becarios de la COFAA-IPN, EDI

²Instituto de Investigaciones Marinas (CSIC), Eduardo Cabello 6, 36208, Vigo, España

³Centro de Investigación Científica y de Educación Superior de Ensenada, CICESE, Unidad La Paz, Calle Miraflores 334, Fraccionamiento Bella Vista, A.P. 23050. La Paz, BCS, México

E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

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-a were analyzed in the Bay. During spring-early summer (April-June) seawaters were colder and richer in new nutrients and chlorophyll-a 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.

Key words:  New nutrient, regenerated nutrient, chlorophyll-a, coastal upwelling

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