Competitive exclusion after invasion?
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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.
- Competitive exclusion after invasion?
Volume 10, Issue 3 , pp 359-368
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- Print ISSN
- Online ISSN
- Springer Netherlands
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- Community structure
- Competitive exclusion
- Introduced exotic species
- Long-term empirical data
- Resource limitation
- Industry Sectors
- Author Affiliations
- 1. Norwegian Institute of Gene Ecology, The Science Park, P.O. Box 6418, Tromso, 9294, Norway
- 2. Norwegian College of Fishery Science, University of Tromsø, Tromso, 9037, Norway
- 3. Department of Natural Resources and Environmental Science, University of Nevada, Reno, Mail Stop 186/1000 Valley Road, Reno, NV, 89012-0013, USA