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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-Duarte1,2, 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: rcervan@ipn.mx

 

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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