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Biology Faculty |
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THOMAS HRABIK
Associate Professor
B.S., 1993, University of Wisconsin Stevens Point
M.S., 1995, University of Wisconsin Madison
Ph.D., 1999, University of Wisconsin Madison
Email: thrabik@d.umn.edu
Office: 11 SSB
Phone: 726-7626 |
Research
Aquatic Ecology, Fisheries, Hydroacoustics
My research program is presently examining several aspects of fisheries ecology. I have projects focused on studying the interactions between exotic and native fishes, the effects of changing climate on habitat quality for cold water fishes and nutrient regeneration-translocation by vertically migrating fauna in the recovering food web of Lake Superior. While this group of topics is diverse, each is important for they are focused on examining the influence of human induced environmental change on aquatic communities.
Fish populations are a vital source of revenue for economic interests in sport and commercial fisheries, as well as a vital link in ecosystem processes that influence water quality. Understanding linkages between aquatic species and ecosystems is vital to predicting the effects of changing the natural environment.
Recent Publications
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Jensen, O.P. D.J. Gilroy, M.J. Vander Zanden, S. Chandra, Z. Hogan, B.C. Allen, T.R. Hrabik, B.C. Weidel. 2009. Evaluating alternative fisheries for taimen, Hucho taimen, in Mongolia. In Press. Can. J. Fish. Aquat. Sci.
- Yule, D.L., J.D. Stockwell, D.R. Schreiner, L.M. Evrard, M. Balge, and T.R. Hrabik. 2009. Seasonal Abundance of Pelagic Forage Fishes and Spawning-Size Cisco in the Western Arm of Lake Superior. Fisheries Research 96:39-50.
- Stockwell, J.S., M.P. Ebener, J.A.Black, T.R. Hrabik, R.A. Kinnunen, W.P. Mattes, J.K. Oyadamari, S.T. Schram, D.R. Schreiner, M.J. Seider, S.P. Sitar, and D.P. Yule. 2009. A synthesis of cisco (Coregonus artedi) in Lake Superior: implications for native fish recovery in the Great Lakes. North American Journal of Fisheries Management.
- Jensen, O.P., P.M. Yurista, T.R. Hrabik, J.D. Stockwell. 2009. Densities and diel vertical migration of /Mysis relicta/ in Lake Superior: a comparison of optical plankton counter and net-based approaches. Verh. Internat. Verein. Limnol. 30:957-963.
- Stockwell, J., D. Yule, T.R. Hrabik and B. Holbrook. 2008. Vertical distribution of fish biomass in Lake Superior: implications for day bottom trawl surveys. North American Journal of Fisheries Management 27:735-749.
- Ray, B. A., T. R. Hrabik, M. P. Ebener, O. T. Gorman, D. R. Schreiner, S. T. Schram, S. Sitar, W. P. Mattes. 2007. Variability in Lake Superior salmonine predator diet characteristics and selectivity from 1986-2001. Journal of Great Lakes Research 33: 104-113.
Teaches
- BIOL 4761 Ichthyology
- BIOL 5805 Fisheries Ecology
- BIOL 2802 Ecology Lab
Current Graduate Student Projects
- Tyler Ahrenstorff. Ph.D. Diel vertical migration as a mediating factor in tropic interactions and nutrient transport in aquatic ecosystems.
- Edmund Issac. MSc. Evaluation of Mysis relicta as a keystone species in the food web of Lake Superior
- Allison Gamble. Ph.D. The influence of habitat characteristics on trophic exchange in Lake Superior
- Matt Balge. Ph.D. Spatial variability in the composition and biomass of Lake Superior pelagic fishes.
- Beth Holbrook. Ph.D. The role of mesoscale eddies in the ecology of offshore waters of Lake Superior.
Recently Completed Graduate Student Projects
- Beth Holbrook. (MSc. Biology) Factors influencing success of age-0 lake trout on reef complexes in Lake Superior. University of Minnesota Duluth. May 2006.
- Trent Liebich. (MSc., Biology) Water quality and Atlantic salmon survival: stream-side rearing studies on the Dennys, Pleasant and Kenduskeag Rivers. May 2007
- Tyler Ahrenstorff (MSc., Integrated Biosciences)(Primary Advisor). Seasonal variability in diel vertical migration of invertebrates and planktivorous fish in western Lake Superior. May 2009.
- Josh Dumke (MSc., Integrated Biosciences)(Primary Advisor). Thesis -- Evaluation of Channel Morphology Change and Biotic Response to a Habitat Improvement Technique in a Wisconsin Lake Superior Tributary. May 2009.
Recent UROP Student Projects
- Thomas Pevan. Seasonal variability of the zooplankton community in western Lake Superior. 2007.
- Jacob Olson. Seasonal variability in feeding habits of three coregonines in western Lake Superior. 2007.
Hobbies
Fishing, Skiing, Scuba Diving, Canoeing, Camping
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