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To monitor the composition and the vertical flux of particulate matter from the sea surface, a sediment trap was moored in Cuenca Alfonso, Bahía de La Paz, a zone of high productivity in the southwestern Gulf of California. Carbonate-free samples from 2002 to 2005 were analyzed for C_org, N, d¹³C, and d¹⁵N. The results show seasonal and interannual variability, with the d¹³C and d¹⁵N values larger in spring and summer than in fall and winter. The C:N ratio and d¹³C increased by 1.5 units from 2002 to 2003–2005, suggesting a change in the supply of organic matter and-or the use or preferential degradation of N_org. There was no interannual variation in d¹⁵N. The occasional high d¹⁵N values suggest that physical mechanisms, such as the shoaling and advection into the bay of ¹⁵N-rich subsurface equatorial water, occur over short time periods. The latter is presumed to be related to the periodic development of a significant cyclonic gyre in the southern Gulf.

Palabras clave: Guadalupe fur seal; Ciclo biogeoquímico del carbono; particulate element fluxes; Body growth; Organic carbon and nitrógeno; C:N ratio

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