Influences of Lake Trout (Salvelinus namaycush) and Mysis diluviana on kokanee (Oncorhynchus nerka) in Lake Pend Oreille, Idaho
- 43 Downloads
Research on Lake Pend Oreille, Idaho, has focused on the influence of two potential limiting factors for kokanee Oncorhynchus nerka (Walbaum, 1792): competition for food with Mysis diluviana (Loven, 1862, hereafter Mysis) and predation by lake trout Salvelinus namaycush (Walbaum, 1792). Population fluctuations of Mysis and lake trout have resulted in substantial heterogeneity in food web conditions, apparently altering both bottom-up and top-down dynamics. Therefore, relative importance of predation and competition were evaluated as drivers of kokanee abundance, biomass, and production. A series of general linear models was used to evaluate relative influences of Mysis and lake trout on kokanee. Kokanee production was a density-dependent process and the collapse of Mysis corresponded to an increase in the modeled maximum annual production of kokanee from 224 tonnes to 408 tonnes. Lake trout also negatively influenced kokanee biomass. A Mysis-mediated, predator-induced kokanee biomass collapse occurred when lake trout and Mysis abundances were both high. Sustainable management of this fishery requires recognition that competition with Mysis will define the scope of kokanee production and therefore the scope of sustainable predation.
KeywordsDensity-dependence Competition Predation Predator suppression Thresholds
This study was supported by U.S. Department of Energy - Bonneville Power Administration (Grant No. 1994-047-00). Avista Utilities provided funding for lake trout netting operations. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The authors would like to thank the numerous professionals who have contributed to the Lake Pend Oreille Fishery Research Program over the last two decades.
- Ashley, K., L. C. Thompson, D. C. Lasenby, L. McEachern, K. E. Smokorowski & D. Sebastian, 1997. Restoration of an interior lake ecosystem: the Kootenay Lake fertilization experiment. Water Quality Research Journal of Canada 32: 295–323.Google Scholar
- Bowles, E. C., B. E. Rieman, G. R. Mauser & D. H. Bennett, 1991. Effects of introductions of Mysis relicta on fisheries in northern Idaho. In Nesler, T. P. & E. P. Bergerson (eds), Mysids in Fisheries: Hard Lessons from Headlong Introductions. American Fisheries Society Symposium 9: 65–74.Google Scholar
- Burnham, K. P. & D. R. Anderson, 2003. Model Selection and Multimodel Inference: A Practical Information-Theoretic Approach. Springer, New York.Google Scholar
- Chipps, S. R. & D. H. Bennett, 2000. Zooplanktivory and nutrient regeneration by invertebrate (Mysis relicta) and vertebrate (Oncorhynchus nerka) planktivores: implications for trophic interactions in oligotrophic lakes. Transactions of the American Fisheries Society 129: 569–583.CrossRefGoogle Scholar
- Dux, A. M., M. J. Hansen, M. P. Corsi, N. C. Wahl, J. P. Fredericks, C. E. Corsi, D. J. Schill & N. J. Horner, 2019. Effectiveness of Lake Trout (Salvelinus namaycush) Suppression in Lake Pend Oreille, Idaho: 2006–2016. Hydrobiologia, this issue.Google Scholar
- Ellis, B. K., J. A. Stanford, D. Goodman, C. P. Stafford, D. L. Gustafson, D. Beauchamp, D. W. Chess, J. A. Craft, M. A. Deleray & B. S. Hansen, 2011. Long-term effects of a trophic cascade in a large lake ecosystem. Proceedings of the National Academy of Sciences 108: 1070–1075.CrossRefGoogle Scholar
- Hansen, M. J., M. P. Corsi & A. M. Dux. 2019. Long-term suppression of the Lake Trout (Salvelinus namaycush) population in Lake Pend Oreille, Idaho. Hydrobiologia.Google Scholar
- Hayes, D. B., J. R. Bence, T. J. Kwak & B. E. Thompson, 2007. Abundance, biomass, and production estimation. In Guy, C. S. & M. L. Brown (eds), Analysis and Interpretation of Freshwater Fisheries Data. American Fisheries Society, Bethesda, Maryland: 327–374.Google Scholar
- Northcote, T. G., 1991. Success, problems, and control of introduced mysid populations in lakes and reservoirs. In Nesler, T.P. & E.P. Bergerson (eds), Mysids in Fisheries: Hard Lessons from Headlong Introductions. American Fisheries Society Symposium 9: 5–16.Google Scholar
- Parker-Stetter, S. L., L. G. Rudstam, P. J. Sullivan & D. M. Warner, 2009. Standard operating procedures for fisheries acoustic surveys in the Great Lakes. Great Lakes Fishery Commission, Special Publication 09-01. Ann Arbor, Michigan [available on internet at http://www.glfc.org/glfc-publications-reports.php 07/13/2018].
- Quinn II, T. J. & R. B. Deriso, 1999. Quantitative Fish Dynamics. Oxford University Press, New York.Google Scholar
- Quiros, R. & M. B. Boveri, 1999. Fish effects on reservoir trophic relationships. Theoretical Reservoir Ecology and its Applications 1999: 529–536.Google Scholar
- Ricker, W. E., 1975. Computation and interpretation of biological statistics of fish populations. Bulletin 191 of the Fisheries Research Board of Canada, Ottawa, Canada.Google Scholar
- Vidergar, D. T., 2000. Population estimates, food habits and estimates of consumption of selected predatory fishes in Lake Pend Oreille, Idaho. Master’s thesis. University of Idaho.Google Scholar
- Whitlock, S. L., M. C. Quist & A. M. Dux, In Press. Effects of water-level management and hatchery supplementation on kokanee recruitment in Lake Pend Oreille, Idaho. Northwest Science.Google Scholar