The potential effect of nitrogen removal processes on the δ15N from different taxa in the mexican subtropical north eastern Pacific

J. Camalich; A. Sánchez; S. Aguí­ñiga; E. F. Balart

doi:10.37543/oceanides.v27i2.114

Autores/as

J. Camalich
A. Sánchez
S. Aguíñiga
E. F. Balart

DOI:

https://doi.org/10.37543/oceanides.v27i2.114

Palabras clave:

Pácifico nororiental subtropical, ciclo del nitrógeno, δ15N, zona de mínimo oxígeno

Resumen

El Pacífico subtropical noroeste es una de las zonas más importantes del océano en las cuales el
nitrógeno es utilizado por procesos bacterianos que se intensifican bajo condiciones bajas de oxígeno como las que se encuentran comúnmente en las zonas de surgencia a lo largo de las costas del Pacifico. El incremento en la señal isotópica de N con respecto al nivel trófico (δ15N) es bien conocido, sin embargo su transferencia desde la fracción disuelta hasta niveles tróficos altos no ha sido estudiada a profundidad en zonas del océano en las
cuales las concentraciones de oxígeno son bajas. Los objetivos de este estudio son: 1) reportar valores de δ15N de diferentes compartimentos (abióticos y bióticos) recolectados en la zona oceánica de baja concentración de oxígeno frente a Bahía Magdalena (Pacifico subtropical noreste Mexicano); 2) comparar δ15N de diferentes
niveles tróficos con organismos análogos de regiones en las cuales la fijación de nitrógeno es el procesos dominante; esto nos permitirá evaluar la transferencia real de δ15N enriquecido en 15N a través de la red trófica hasta depredadores tope. El δ15N de los componentes abióticos y abióticos fue más alto que los reportados en regiones con una alta tasa de fijación de N. Las concentraciones de oxígeno en la zona de estudio son bajas (< 2ml/l) a profundidades superficiales (< 100m) aunque no anóxicas. No obstante, la señal de δ15N refleja desnitrificación y esta señal es transferida a lo largo de la cadena trófica.

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Citas

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