Original Paper

Biological Invasions

, Volume 10, Issue 3, pp 359-368

First online:

Competitive exclusion after invasion?

  • Thomas BøhnAffiliated withNorwegian Institute of Gene Ecology, The Science Park Email author 
  • , Per-Arne AmundsenAffiliated withNorwegian College of Fishery Science, University of Tromsø
  • , Ashley SparrowAffiliated withDepartment of Natural Resources and Environmental Science, University of Nevada

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The ‘Competitive Exclusion Principle’ is a foundation stone in the understanding of interspecific competition and niche relationships between species. In spite of having the status of a biological law, the principle has limited empirical support. In this study, we document strong effects of competition from the invading fish species vendace Coregonus albula over a 14-year period in the sub-arctic Pasvik watercourse. The native d.r. whitefish, that shared food and habitat niche with the invader, was displaced from its original niche and showed a more than 90% decline in population density over the study period. The study thus provides a unique record of how an exotic fish species excludes a native species from its original niche. Our data support the competitive exclusion principle, but also indicate that the vulnerability of the inferior competitor depends on a lack of alternative resources and on indirect ecological interactions.


Community structure Competitive exclusion Introduced exotic species Long-term empirical data Resource limitation