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The role of nitrogen fixation in biogeochemical cycling in the subtropical North Pacific Ocean

Nature volume 388, pages 533–538 (1997)Cite this article

Abstract

Seven years of time-series observations of biogeochemical processes in the subtropical North Pacific Ocean gyre have revealed dramatic changes in the microbial community structure and in the mechanisms of nutrient cycling in response to large-scale ocean–atmosphere interactions. Several independent lines of evidence show that the fixation of atmospheric nitrogen by cyanobacteria can fuel up to half of the new production. These and other observations demand a reassessment of present views of nutrient and carbon cycling in one of the Earth′s largest biomes.

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Figure 1: Time series of N and P analyses of dissolved and particulate matter, expressed as N:P (mol:mol) ratios, for dissolved matter (upper panel), suspended particulate matter (centre panel) and exported particulate matter (lower panel).
Figure 2: Role of N2 fixation as a source of new nitrogen as determined by the N–P mass-balance model (see text).
Figure 3: Dissolved nitrogen pool dynamics for the upper portion of the water column (0–100 m) at station ALOHA during the 1991–92 ENSO event.
Figure 4: Dissolved phosphorus pool dynamics at station ALOHA for the period 1989–94, including the period corresponding to the extended 1991 –92 ENSO event.

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Acknowledgements

We thank the HOT Program scientists and staff, and the officers and crew members of the research vessels used in our field work for making this study possible, and E. Laws for comments on the manuscript. This work was supported in part by the National Science Foundation.

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Authors and Affiliations

  1. Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, 96822, Hawaii, USA

    D. Karl, L. Tupas, J. Dore & D. Hebel

  2. College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, 97331-5503, Oregon , USA

    R. Letelier

  3. Aquasearch Inc., 73-4460 Queen Kaahumanu Highway, Suite 110, Kailua-Kona, 96740, Hawaii, USA

    J. Dore

  4. Department of Oceanography, Dalhousie University, Halifax, B3H 4J1, Nova Scotia, Canada

    J. Christian

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Correspondence to D. Karl.

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Karl, D., Letelier, R., Tupas, L. et al. The role of nitrogen fixation in biogeochemical cycling in the subtropical North Pacific Ocean. Nature 388, 533–538 (1997). https://doi.org/10.1038/41474

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