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Biogeochemistry

, Volume 94, Issue 2, pp 95–110 | Cite as

Nitrogen fixation varies spatially and seasonally in linked stream-lake ecosystems

  • Amy M. Marcarelli
  • Wayne A. Wurtsbaugh
Article

Abstract

We performed surveys of nitrogen (N2)-fixation in three oligotrophic lake-stream systems in the Sawtooth Mountains of central Idaho to address two questions: (1) Which habitat types within linked lake-stream systems (lake pelagic, lake benthic, and stream) exhibit the highest rates of N2 fixation?, and (2) How does N2 fixation compare to the hydrologic flux of nitrogen? A seasonal survey showed that N2 fixation in a single lake and its outlet stream peaked in late summer, when hydrologic N fluxes were lowest. Benthic lake N2-fixation rates by epiphytes were highest at mid-lake depths, where their percent cover was highest, while rates by epipelon were greatest at shallow lake depths. Pelagic N2 fixation was below detection. Stream N2-fixation rates were greatest on rock substrates and in the lake outlet stream. These patterns were supported by a baseflow survey (late July) in three lake-stream ecosystems which confirmed that N2-fixation rates peaked in the lake benthos at shallow depths and on rock substrates in outlet streams. Scaling N2-fixation rates to whole lake and stream areas revealed that N2 fixation could exceed the nitrate, and sometimes the total dissolved nitrogen flux during baseflow in lakes and outlet streams. Despite low rates, total N2-fixation contributions (kg/day) from lakes were greater because they had far larger surface areas than the stream environments. Fixed nitrogen contributions from stream outlets were also relatively high because of high N2-fixation rates and despite low surface areas. This study suggests that N2 fixation could be a seasonally important nitrogen source to nutrient deficient subalpine lake-stream ecosystems. In addition, the frequency and location of lakes could control N2-fixation contributions to watersheds by providing a large area for within-lake N2 fixation, and creating conditions favorable for N2 fixation in outlet streams.

Keywords

Hydrologic N flux Linked lake-stream ecosystems Nitrogen fixation Oligotrophic Subalpine watersheds Cyanobacteria 

Notes

Acknowledgments

Funding for this study was provided by NSF grant DEB 01-32983 to W. W. and by the Ecology Center at Utah State University. A. M. was also supported by the College of Natural Resources and the Ecology Center at U. S. U., and the NSF-Idaho EPSCoR program (EPS 04-47689) during manuscript preparation. R. Metz and K. Grover-Wier with Boise National Forest and L. Dean with the Sawtooth National Recreation Area arranged access to study sites. Field, lab, and intellectual support and assistance was provided by J. Anderson, C. Arp, M. Baker, B. Brandywie, M. Bozeman, P. Brown, P. Cole, J. Garrett, S. Meats, J. Moore, K. Nydick, D. Ratcliff, and L. Ratcliff. J. Anderson provided cartographic assistance. S. Durham assisted with statistical analyses. Earlier versions of this manuscript were improved by reviews from H. Van Miegroet, C. Luecke and four anonymous reviewers.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Department of Watershed Sciences and the Ecology CenterUtah State UniversityLoganUSA
  2. 2.Stream Ecology Center, Department of Biological SciencesIdaho State UniversityPocatelloUSA

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