[...]... L1646_C01.fm Page 7 Saturday, July 12, 2003 4:10 PM Chapter one: Factors that shape lake trout ecosystems 7 Figure 1.4 Boreal Shield lake trout lakes shape the distribution and dynamics of lake trout populations and their management challenges These lakes exhibit a rather narrow range of physical and chemical characteristics (Table 1.1) They are usually rather cold, clear, deep, and dilute lakes (Martin and... located on Precambrian Shield bedrock are included in the data set for this table Mean ± 1 S.D., median and sample size (N) are indicated The Laurentian Great Lakes and 33 other large lakes (>10,000 ha) were not included We tried to limit the data set only to lakes that supported reproducing lake trout populations Populations maintained by hatchery stocking are excluded when the information was available... II: Environmental factors that affect Boreal Shield ecosystems Chapter 4 Land, water, and human activity on Boreal watersheds 59 Robert J Steedman, Craig J Allan, Robert L France, and Robert S Kushneriuk Chapter 5 Impact of new reservoirs .87 Michel Legault, Jean Benoît, and Roger Bérubé Chapter 6 Lake trout (Salvelinus namaycush) habitat volumes and boundaries in Canadian Shield lakes... Page xxii Thursday, November 6, 2003 8:44 AM xxii Boreal Shield Watersheds: Lake Trout Ecosystems in a Changing Environment Bev J Clark, Peter J Dillon, and Lewis A Molot Chapter 7 The effects of phosphorus and nitrogen on lake trout (Salvelinus namaycush) production and habitat 119 Peter J Dillon, Bev J Clark, and Hayla E Evans Chapter 8 Dissolved organic carbon as a controlling variable in lake. .. 1 Lake trout, the Boreal Shield, and the factors that shape lake trout ecosystems .3 John M Gunn and Roger Pitblado Chapter 2 History and evolution of lake trout in Shield lakes: past and future challenges 21 Chris C Wilson and Nicholas E Mandrak Chapter 3 Rehabilitation of lake trout in the Great Lakes: past lessons and future challenges 37 Charles C Krueger and Mark... 1.5 Examples of lake trout ecosystems (A) Ultraclear lakes in Killarney Park, Ontario (photo by Ed Snucins) (B) Lake 233 at the Experimental Lakes Area in northwestern Ontario (photo by John Shearer) (C) Close-up of southern part of McCulloch Lake (47°20¢N, 80°42¢W) near the height of land for Ontario Lake shown again in Landsat image (Figure 1.7) (photo by Vic Liimatainen) (D) Trout Lake, Wisconsin (photo... one: Factors that shape lake trout ecosystems 5 (C) (D) Figure 1.1 (continued) (C) Embryos ready to hatch in early March (photo by Vic Liimatainen) (D) Emergent alevins in May (photo by Rod Sein) Arctic animals that live in unproductive ecosystems, the lake trout has evolved a life history strategy that invests in a few, long-lived, late maturing, large-bodied individuals This makes the lake trout. .. Thursday, November 6, 2003 8:44 AM xviii Boreal Shield Watersheds: Lake Trout Ecosystems in a Changing Environment Christopher Eagar Northeast Forest Experiment Station USDA Forest Service Durham, New Hampshire Mark P Ebener Great Lakes Fishery Commission Sault Saint Marie, Michigan Hayla E Evans RODA Environmental Research Limited Lake eld, Ontario Henri Fournier Direction de l’aménagement de la faune... Rod Sein, and Wayne Selinger (Ontario Ministry of Natural Resources), Michel Legault (Société de la faune et des parcs du Québec), Gary Siesennop and Mark Ebbers (Minnesota Department of Natural Resources), and Walter Kretser, Richard Costanza, Bill Gordon, and Richard Preall (Adirondack Lake Survey Corporation) Paul Morgan established the Canadian Shield Trout Scholarship Program at Laurentian University... University of Wisconsin L1646_C00.fm Page xi Thursday, November 6, 2003 8:44 AM Preface: Boreal Shield ecosystems Deep, clear Boreal Shield lakes carved from Precambrian bedrock have long defined the northern wilderness and are the ancestral home and interglacial refuge of the lake trout, Salvelinus namaycush The lakes, streams, and wetlands of this ecozone are tightly linked to the austere watersheds of the .