Hydrobiologia

, Volume 518, Issue 1, pp 47–57

The importance of hyporheic sediment respiration in several mid-order Michigan rivers: comparison between methods in estimates of lotic metabolism

Authors

  • D.G. Uzarski
    • Grand Valley State University, Annis Water Resources Institute
  • C.A. Stricker
    • Department of ZoologyMichigan State University
  • T.M. Burton
    • Department of ZoologyMichigan State University
    • Department of Fisheries and WildlifeMichigan State University
  • D.K. King
    • Department of BiologyCentral Michigan University
  • A.D. Steinman
    • Grand Valley State University, Annis Water Resources Institute
Article

DOI: 10.1023/B:HYDR.0000025056.18736.d6

Cite this article as:
Uzarski, D., Stricker, C., Burton, T. et al. Hydrobiologia (2004) 518: 47. doi:10.1023/B:HYDR.0000025056.18736.d6

Abstract

Metabolism was measured in four Michigan streams, comparing estimates made using a flow-through chamber designed to include the hyporheic zone to a 20 cm depth and a traditional closed chamber that enclosed to a 5 cm depth. Mean levels of gross primary productivity and community respiration were consistently greater in the flow-through chamber than the closed chamber in all streams. Ratios of productivity to respiration (P/R) were consistently greater in the closed chambers than the flow-through chambers. P/R ratios were consistently <1 in all streams when estimated with flow-through chambers, suggesting heterotrophic conditions. Maintenance of stream ecosystem structure and function therefore is dependent on subsidies either from the adjacent terrestrial system or upstream sources. Our results suggest that stream metabolism studies that rely on extrapolation of closed chambers to the whole reach will most likely underestimate gross primary productivity and community respiration.

stream metabolismgross primary productivitycommunity respirationhyporheic zoneP/R ratio

Copyright information

© Kluwer Academic Publishers 2004