Oecologia

, Volume 119, Issue 2, pp 247–255 | Cite as

Nitrogen and phosphorus uptake in two Idaho (USA) headwater wilderness streams

  • Jeffrey C. Davis
  • G. Wayne Minshall
Article

Abstract

Nitrate and phosphate solutions were released into two reaches of two central Idaho streams to determine within- and between-stream variability in uptake lengths, uptake rates, and mass transfer coefficients. Physical and biotic stream characteristics and periphyton nitrate-uptake rates in recirculating chambers were measured to determine their influence on nutrient dynamics. Phosphate uptake length did not differ among the four reaches. There were no within-stream differences in nitrate uptake lengths but they did differ between the two streams. Long nitrate uptake lengths likely were due to instream concentrations above saturation but also may have been influenced by differences in active surface area and algal abundance. Nitrate and phosphate uptake lengths were longer, and uptake rates higher, than most other published values. However, mass transfer coefficients were comparable to measurements in other streams. Mass transfer coefficients may be a better parameter for temporal and spatial comparisons of instream nutrient dynamics, and for determining the underlying causes of variability in uptake length.

Key words Nitrogen Phosphorus Nutrient spiraling Uptake rate and length Stream nutrient cycling 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • Jeffrey C. Davis
    • 1
  • G. Wayne Minshall
    • 2
  1. 1.Streamside Environmental Services, P.O. Box 771428, Eagle River, AK 99577, USA Tel.: +1-907-6964240, Fax: +1-907-5616134US
  2. 2.Stream Ecology Center, Department of Biological Sciences, Idaho State University, Pocatello, ID 83209, USAUS

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