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Seasonal variability of particulate organic matter (POM) fluxes and the amount exported from the upper 200 m of the water column was studied during four oceanographic cruises in Guaymas Basin during autumn 1994 and spring, summer, and autumn 1995. We used an array of drifting sediment traps to measure the particulate fluxes at 50, 100, and 200 m depths in the upper water column. The mean depths of the mixed layer varied from 20.8 m in summer 1995 to 29.6 m in spring 1995, and of the euphotic zone from 33.2 m in spring 1995 to 51.6 m in summer 1995. Mean phytoplankton biomass ranged from 36.9 mg Chla m–2 in autumn 1995 to 85.9 mg Chla m–2 in spring 1995. Higher POM fluxes occurred during autumn 1994 and spring 1995, while lower fluxes occurred during summer and autumn 1995. The percentage of daily primary productivity exported from the upper 200 m of the water column varied from 3.6% to 8.9% and is within the range reported for other regions. The C:N ratios were homogeneous, regardless of depth, and varied from 9.0 to 13.8. The particulate organic carbon residence time varied from 3.7 to 11.2 d, and was higher in summer and lower in autumn. Consequently, benthonic heterotrophic organisms get their food from seasonal pulses. The total exported carbon for the area was estimated to be about 300 × 103 t yr–1, which suggests that during summer, this region acts as a carbon sink; however, more data are needed to understand the yearly balance.   Se efectuaron cuatro cruceros en la Cuenca de Guaymas (otono de 1994, y primavera, verano y otono de 1995) para estudiar las variaciones estacionales de los flujos de materia organica particulada (MOP) y la cantidad exportada desde los primeros 200 m de la columna de agua. Se uso un arreglo de trampas de sedimentacion de deriva colocadas a 50, 100 y 200 m en la capa superior de la columna de agua para medir los flujos de particulas. Las profundidades promedio de la capa de mezcla variaron entre 20.8 m en verano de 1995 y 29.6 m en primavera de 1995, y las de la zona eufotica entre 33.2 m en primavera de 1995 y 51.6 m en verano de 1995. El promedio de la biomasa del fitoplancton presento un intervalo entre 36.9 mg Cla m–2 en otono de 1995 y 85.9 mg Cla m–2 en primavera de 1995. Los flujos maximos de MOP ocurrieron en otono de 1994 y primavera de 1995, y los minimos en verano y otono de 1995. El porcentaje de la produccion primaria diaria exportada desde los primeros 200 m vario entre 3.6% y 8.9% y se encuentra dentro del intervalo documentado para otras regiones. Los valores de C:N se mantuvieron homogeneos, independientemente de la profundidad, variando entre 9.0 y 13.8. El tiempo de residencia del carbono organico particulado vario entre 3.7 y 11.2 d, siendo mayor en verano que en otono. Consecuentemente, los organismos heterotrofos que viven en el piso oceanico reciben alimento en pulsos estacionales. El carbono total exportado para el area se estimo en cerca de 300 × 103 t ano–1, lo cual sugiere que durante el verano esta region se comporta como un sumidero de carbono; sin embargo, es necesario contar con mayor informacion para conocer el balance anual.

Seasonal variability of the particulate organic matter vertical flux in the central region of the Gulf of California