Hydrobiologia

, Volume 87, Issue 1, pp 77–97

Production of Gammarus pulex L. (Amphipoda) in a small Danish stream

  • Erik Mortensen
Article

DOI: 10.1007/BF00016664

Cite this article as:
Mortensen, E. Hydrobiologia (1982) 87: 77. doi:10.1007/BF00016664

Abstract

Quantitative samples of Gammarus pulex L. taken from a small Danish stream during 1975 showed mean annual population densities varying from 500 m−2 in early May to 5 500 m−2 in late September. The mean annual biomass was 1.5 g dry weight m−2. No discrete cohorts could be distinguished from the size frequency distributions. Annual production, estimated by the size-frequency method, was 3.9 g dry weight M-2 and P/B ratio was 2.6. The contribution to trout energetics may have been as much as 17%.

Keywords

stream production Gammarus food source energy requirement trout 

Copyright information

© Dr W. Junk Publisher 1982

Authors and Affiliations

  • Erik Mortensen
    • 1
  1. 1.The Freshwater LaboratoryNational Agency of Environmental ProtectionSilkeborgDenmark

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