Hydrobiologia

, Volume 579, Issue 1, pp 15–27

The importance of morphodynamic processes at riffles used as spawning grounds during the incubation time of nase (Chondrostoma nasus)

  • Christoph Hauer
  • Günther Unfer
  • Stefan Schmutz
  • Helmut Habersack
Opinion Paper

DOI: 10.1007/s10750-006-0406-7

Cite this article as:
Hauer, C., Unfer, G., Schmutz, S. et al. Hydrobiologia (2007) 579: 15. doi:10.1007/s10750-006-0406-7

Abstract

An ecologically orientated flood protection project was implemented at the Austrian lowland Sulm River. Habitat modelling was conducted during a 3-year monitoring program to assess the effects of river bed embankment and the initiation of a new meander by constructing an initial side channel, and allowing self-developing side erosion. Hydrodynamic and physical habitat models were combined with statistical methods. This study focused on the necessity for including stability analysis when modelling spawning grounds. The critical erosion parameter of the cobbles at spawning grounds was analysed using numerical modelling combined with substrate maps of potential spawning grounds of nase (Chondrostoma nasus). Due to the specific characteristics of this reach of the Sulm River, instability of the riffles can hamper successful reproduction in nase. Spawning grounds of Chondrostoma nasus and their stability must be guaranteed at least for the duration of incubation. This morphodynamic necessity should be incorporated in future restoration projects and when artificially restoring spawning habitats.

Keywords

Habitat modellingRestoration measuresRiver monitoringChondrostoma nasusRifflesSpawning habitats

Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Christoph Hauer
    • 1
    • 2
  • Günther Unfer
    • 1
    • 3
  • Stefan Schmutz
    • 1
    • 3
  • Helmut Habersack
    • 1
    • 2
  1. 1.Department of Water, Atmosphere and EnvironmentBOKU – University of Natural Resources & Applied Life Sciences ViennaViennaAustria
  2. 2.Institute of Water Management, Hydrology and Hydraulic EngineeringViennaAustria
  3. 3.Institute of Hydrobiology and Aquatic Ecosystem ManagementWienAustria