Tom Johnston

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Tom Johnston

T.A. Johnston, Ph.D.
Research Scientist and
Adjunct Professor
Ministry of Natural Resources (MNR)

Phone: (705) 671-3828
Fax: (705) 671-3857

Address:

Cooperative Freshwater Ecology Unit

Living with Lakes Centre

Laurentian University

840 Ramsey Lake Road

Sudbury, Ontario

P3E 2C6, Canada

Research Interests:

I am a fish ecologist with the Aquatic Research Section of the Ontario Ministry of Natural Resources and an Adjunct Professor in the Biology Department at Laurentian University. My research laboratory is located in the Living with Lakes Centre on the shores of Ramsey Lake.

My primary research interests are in the reproductive and trophic ecologies of fishes in the boreal shield region of northern Ontario. Current research projects in my lab are examining i) the role of maternal effects in shaping egg and offspring quality, ii) the factors driving phenotypic divergence and evolution of life history strategies in fishes, iii) the ecology of burbot in boreal lakes, iv) spatial and temporal patterns of mercury bioaccumulation in fishes, v) effects of water clarity on the trophic niches of smallmouth bass and walleye, and vi) how the choice of sampling gear may influence the interpretation of fish community survey data.

Recent Publications:

Cott, P.A., T.A. Johnston, and J.M. Gunn. 2011. Food web position of burbot relative to lake trout, northern pike, and lake whitefish in four sub-arctic boreal lakes. Journal of Applied Ichthyology, In press.

Johnston, T.A., W. Lysack, and W.C. Leggett. 2011. Abundance, growth and life history characteristics of sympatric walleye (Sander vitreus) and sauger (S. canadensis) in Lake Winnipeg, Manitoba. Journal of Great Lakes Research, In press.

Wiegand, M.D., T.A. Johnston, L.R. Brown, S.B. Brown, J.M. Casselman, and W.C. Leggett. 2011. Maternal influences on thiamine status of walleye (Sander vitreus) ova. Journal of Fish Biology 78: 810-824.

Moles, M.D., T.A. Johnston, B.W. Robinson, A.M. Bernard, C.C. Wilson, M.D. Wiegand, and W.C. Leggett. 2011. Reproductive divergence between growth forms of Lake Winnipeg walleye (Sander vitreus). Ecology of Freshwater Fish 20: 52-66.

Moles, M.D., B.W. Robinson, T.A. Johnston, R.A. Cunjak, T.D. Jardine, J.M. Casselman, and W.C. Leggett.. 2010. Morphological and trophic differentiation of growth morphotypes of Lake Winnipeg walleye (Sander vitreus). Canadian Journal of Zoology 88: 950-960.

Johnston, T.A., M. Power, and M. Keir. 2010. Response of native and naturalized fishes to salmonid cage culture farms in northern Lake Huron, Canada. Transactions of the American Fisheries Society 139: 660-670.

Venturelli, P.A., C.A. Murphy, B.J. Shuter, T.A. Johnston, P.J. van Coeverden de Groot, P.T. Boag, J.M. Casselman, R. Montgomerie, M.D. Wiegand, and W.C. Leggett. 2010. Maternal influences on population dynamics: evidence from an exploited freshwater fish. Ecology 91: 2003-2012.

Johnston, T.A., M.D. Wiegand, S. Mittermuller, J.M. Casselman, G.G. Pyle, and W.C. Leggett. 2008. Metal provisioning of ova in walleye and lake whitefish. Aquaculture 281: 131-137.

Johnston, T.A., S.D. Kaufman, M.D. Moles, M.D. Wiegand, and W.C. Leggett. 2008. Effects of delayed fertilization on embryo viability in walleye: the role of maternal effects. Journal of Fish Biology 72: 2634-2644.

Moles, M.D., T.A. Johnston, B.W. Robinson, W.C. Leggett, and J.M. Casselman. 2008. Is gonadal investment in walleye (Sander vitreus) dependent on body lipid reserves? A multipopulation comparative analysis. Canadian Journal of Fisheries and Aquatic Sciences 65: 600-614.

Kaufman, S.D., T.A. Johnston, W.C. Leggett, M.D. Moles, J.M. Casselman, and A.I. Schulte-Hostedde. 2007. Relationships between body condition indices and proximate composition in adult walleyes. Transactions of the American Fisheries Society 136: 1566-1576.

Wiegand, M.D., T.A. Johnston, W.C. Leggett, K.E. Watchorn, A.J. Ballevona, L.R. Porteous, and J.M. Casselman. 2007. Contrasting strategies of ova lipid provisioning in relation to maternal characteristics in three walleye populations. Canadian Journal of Fisheries and Aquatic Sciences 64: 700-712.

Johnston, T.A., M.D. Wiegand, W.C. Leggett, R.J. Pronyk, S.D. Dyal, K.E. Watchorn, S. Kollar, and J.M. Casselman. 2007. Hatching success of walleye embryos in relation to maternal and ova characteristics. Ecology of Freshwater Fish 16: 295-306.

Swanson, H.K., T.A. Johnston, D.W. Schindler, R.A. Bodaly, and D.M. Whittle. 2006. Mercury bioaccumulation in forage fish communities invaded by rainbow smelt (Osmerus mordax). Environmental Science and Technology 40: 1439-1446.