B.S., 1993, University of Wisconsin Stevens Point
M.S., 1995, University of Wisconsin Madison
Ph.D., 1999, University of Wisconsin Madison
SSB 11, 726-7626
Ecology, Fisheries, Hydroacoustics
research program is presently examining several aspects of fisheries
ecology. I have projects focused on studying the local and regional
factors influencing the fish diversity and dispersal small and large
lake ecosystems, the interactions between exotic and native fishes,
and the accumulation of toxic chemicals in fish tissue. While this group
of topics is diverse, each is extremely important for they are focused
on examining the influence of anthropogenically induced environmental
change on fish communities.
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
fishes and the ever changing environment is vital to predicting the
effects of changing the natural environment.
T.R ., O. P. Jensen, S. J. D. Martell, C. J. Walters and J. F. Kitchell. 2006. Evidence for persistent diel vertical migration in the Lake Superior pelagic foodweb. In Press. Canadian Journal of Fisheries and Aquatic Sciences.
Jensen, O. P., T. R. Hrabik, S. J. D. Martell, C. J. Walters and J. F. Kitchell. 2006. Diel vertical migration in a Lake Superior pelagic community: modeling trade-offs at three trophic levels. In Press: Canadian Journal of Fisheries and Aquatic Sciences.
- Ray, B. A., T. R. Hrabik, M. P. Ebener, O. T. Gorman, D. R. Schreiner, S. T. Schram, S. Sitar, W. P. Mattes. 2006. Variability in Lake Superior salmonine predator diet characteristics and selectivity from 1986-2001. Accepted: Journal of Great Lakes Research.
- Holbrook, B. V., T. R. Hrabik, D. K. Branstrator, D. Yule and J. Stockwell. 2006. Estimation of zooplankton biomass using hydroacoustic backscatter at two shoals in the Apostle Island region of Lake Superior. In Press: Journal of Great Lakes Research.
- Sass, G. G., J. F. Kitchell, S. R. Carpenter, T. R. Hrabik, A. Sugden-Newberry, T. K. Kratz and M. G. Turner. Fish community and food web responses to a whole-lake removal of coarse woody habitat. In Press. Fisheries
- Krueger, D. M. and T. Hrabik. 2005. Foodweb alterations that promote native species: the recovery of native cisco (Coregonus artedi) populations through management of native piscivores. Canadian Journal of Fisheries and Aquatic Sciences. 62:2177-2188.
- BIOL 4761
- BIOL 5805
- BIOL 1011
Graduate Student Projects:
Recently Completed Graduate Student Projects
- Beth Holbrook. Factors influencing success of age-0 lake trout on reef complexes in Lake Superior. M.S. Biology University of Minnesota Duluth. May 2006.
- Bradley Ray. Spatial
and Temporal Variability in Prey Fish Composition and Predator Diet
Characteristics in Lake Superior from 1986-2001. M.S. Biology University
of Minnesota Duluth. May 2004.
- John Schwalbe.
Mercury Deposition and Cycling in Northern Wisconsin Lakes and the Effect
of a Decrease in Mercury Deposition on Yellow Perch (Perca Flavescens)
Mercury Concentrations. M.S. Biology University of Minnesota Duluth.
- Damon Krueger.
Management applications for mitigating the negative effects of rainbow
smelt on native fishes. M.S. Biology University of Minnesota Duluth.
- Hazel Richmond
(co-adviser w/A. Mensinger). Foraging mechanisms of age-0 yellow perch.
M.S. Biology University of Minnesota Duluth. May 2003.
UROP Student Projects:
- Tyler Winter. Population
Assessment of Exotic Goldfish and Native Fish Specials in a Small Impoundment.
Skiing, Scuba Diving, Canoeing, Camping