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Conclusions

  • Relative abundance was strongly influenced by channelization but not significant influenced by the other test variables. This points to anthropogenic impact as one of the primary factors controlling the fish abundance in the studied streams.
  • Inceased channelization severeness results in a shift in species composition, causing changes in the stream ecosystem. In the present study, stream parts with low channelization severeness contain rheophilic and eurytopic species. A higher channelization severeness leads to a higher occurrence of eurytopic and limnophilic species.
  • The new method  (NSSN) provides the opportunity to sample areas in streams that are not normally investigated. Thus, the new approach contribute to a greater knowledge of fish communities in running water.                                                                           


Responsible for this page: Agneta Johansson
Last updated: 05/23/13