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Summer surface waters in the Gulf of California: Prime habitat for biological N₂ fixation Public Deposited

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  • We report significant rates of dinitrogen (N₂) fixation in the central basins of the Gulf of California (GC) during July–August 2005. Mixing model estimates based upon δ¹⁵N values of particulate matter in the surface mixed layer indicate that N₂ fixation provides as much as 35% to 48% of the phytoplankton-based nitrogen demand in the central Guaymas and Carmen basins. Microscopic analyses identify the responsible genera as the N₂-fixing endosymbiont, Richelia intracellularis, with lesser contributions from the large nonheterocystous diazotroph Trichodesmium. Analyses of remotely sensed chlorophyll a and sea surface temperature indicate that primary production levels are elevated in regions of the GC where oceanographic conditions are ideal in summertime for the growth of N₂-fixing organisms. These findings suggest that biological N₂ fixation must be taken into account when assessing past and present nitrogen dynamics in this environmentally important region.
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  • White, A. E., F. G. Prahl, R. M. Letelier, and B. N. Popp (2007), Summer surface waters in the Gulf of California: Prime habitat for biological N2 fixation, Global Biogeochem. Cycles, 21, GB2017, doi:10.1029/2006GB002779.
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  • 21
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  • 0886-6236

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