Lake Trout Ecosystems in a Changing Environment - Chapter 11 ppsx
Lake Trout Ecosystems in a Changing Environment - Chapter 11 ppsx
... open-water lake trout fisheriesoccurred on Algonquin Park lakes in the late 1940s and early 1950s. Martin (1954) foundthat in lakes where lake trout mature at a young age (5 years) and a small ... Anglers with tags have the choice of releasing a fish or keeping and tagging it andapplying it to their seasonal or annual quota.An individual tag-and-quota system for lake trout has been in ... 1 day.The impact that winter angling can have on a small Precambrian Shield lake trout lake is shown in Figure 11. 1. A similar exploitation pattern occurred in 1980 in Nelson Lake, a 308-ha rehabilitated...
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Lake Trout Ecosystems in a Changing Environment - Chapter 9 ppsx
... pollutants may be increasingHg concentrations in lake trout in small Boreal lakes. Experimental lake acidification wasobserved to increase Hg in fish (Wiener et al., 1990) and Hg in fish in lakes ... to lake area in a study where the ratio ofcatchment to lake area was not kept constant as in Bodaly et al. (1993). Lakes with pro-portionately larger catchment areas will have greater inputs ... (Perca flavescens), Water Pollution ResearchJournal of Canada 28: 217–236.Health and Welfare Canada, 1984, Methylmercury in Canada, Volume 2, Health and Welfare Canada,Ottawa, Ontario.Hesslein,...
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Lake Trout Ecosystems in a Changing Environment - Chapter 1 pptx
... 8,000 years ago. Lake Agassiz was impounded between the retreating ice margins and the Manitoba Escarpment — the present-day remnants including Lakes Manitoba, Winnipeg, Dauphin, and Winnipegosis. ... banksiana) and red pine (Pinus resinosa); poorly drained sites are characterized by black and white spruce, balsam fir, tamarack (Larix laracina), eastern red cedar (Juniperus virginiana), and willow ... Winnipegosis. In addition to these Manitoban areas, at various stages of its life Lake Agassiz also extended well into Ontario and Saskatchewan in Canada and the northern parts of the states of North Dakota...
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Lake Trout Ecosystems in a Changing Environment - Chapter 2 doc
... Superior basin, and finally eastward into Lake Barlow-Ojib - way (Mandrak and Crossman, 1992). Lake Barlow-Ojibway extended across northeastern Ontario and northwestern Quebec, and drained into the ... variants have been identified in Shield lake trout populations, including black fins (e.g., Redstone Lake) and pale or dark background coloration (e.g., Lost Dog Lake and Canisbay Lake in Algonquin ... Burnham-Curtis, M.K., 1993, Intralacustrine speciation of Salvelinus namaycush in Lake Superior: an investigation of genetic and morphological variation and evolution of lake trout in the Laurentian...
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Lake Trout Ecosystems in a Changing Environment - Chapter 3 doc
... propose stocking all available hatchery-reared lake trout allocated to a lake in a given year into one selected locality that has an abundance of spawning habitat, leavingother areas of the lake unstocked. ... obstacles faced by lake trout in the Great Lakes.Approximately 330 million yearling and fingerling lake trout were released into the GreatLakes from 1950 to 2001, primarily into near-shore areas ... these lake trout were hatchery-origin fish, the survivors of past stockings. Similar increases in lake trout abundance occurred in Lake Ontario in the late 1970s and in Lake Erie in the late 1980sand...
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Lake Trout Ecosystems in a Changing Environment - Chapter 5 pot
... spawning areas in the littoral zones of Lake aux Sables using a tarp(Benoît and Legault, 2002) led lake trout to abandon these areas and reproduce in theartificial deep-water spawning areas ... occurring after lake trout spawning. Draw-downs occurred before lake spawning on 39 lakes and during spawning on 14 lakes (somelakes had drawdowns occurring at more than one time). The modal drawdown ... for many lakes on the Precambrian Shield (Schindler and Gunn,Table 5.1 Characteristics of Québec's Natural Lakes and Reservoirs having a Lake Trout PopulationParameters Natural lakes...
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Lake Trout Ecosystems in a Changing Environment - Chapter 6 ppt
... 1-m increase in transparency would result in an increase in Z10 ofca. 1 m. Following a 2-m increase in transparency, optimal habitat volumes in the samelakes would be reduced by between 8 and ... trout habitat, or any other class of habitat. A 0 © 2004 by CRC Press LLC chapter six Lake trout (Salvelinus namaycush) habitat volumes and boundaries in Canadian Shield lakesBev J. ClarkDorset ... m as a result of a twofold increase in atmospheric CO2 levels. Acidification of lakesby the input of mineral acids also results in increased transparency (Effler et al., 1985),again via removal...
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Lake Trout Ecosystems in a Changing Environment - Chapter 7 ppt
... maximum and (b) mean depths between 1892 lake trout lakes and 436other non lake trout lakes with available data. Lake Trout lakes Non -Lake Trout LakesMaximum Depth (m) 0-1 01 0-2 02 0-3 03 0-4 04 0-5 05 0-6 06 0-7 07 0-8 08 0-9 09 0-1 0010 0-1 1050403020100Percent ... concentration distributions in 293 lake trout lakes and 927 lakes withno lake trout in Ontario. Lake Trout Lakes Non -Lake Trout Lakes 0-2 4-6 8-1 01 2-1 41 6-1 8 2 0-2 22 4-2 6 2 8-3 0Total Phosphorus (µg/L)403020100Percent ... of lake surface areas for 1916 Ontario lake trout lakes and 6824 other lakes in Ontario.403020100All Lakes Lake Trout Lakes 0-2 55 0-7 510 0-1 2515 0-1 7520 0-2 2525 0-2 7530 0-3 2535 0-3 7540 0-4 2545 0-4 75>500Lake...
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Lake Trout Ecosystems in a Changing Environment - Chapter 8 doc
... Molot, L .A. , 2003, Predicting optimal habitat boundaries for lake trout (Salvelinus namaycush Walbaum) in Canadian Shield lakes, Canadian Journal of Fisheries andAquatic Sciences (in press).Dillon, ... long-term integrity of lake trout habitat will require the management of activities in the catchments of lakes thataffect DOC inputs to lakes. Climate change and acid rain also affect fish habitats ... lakes are under a “three-pronged attack” (Figure 8.7). In summary, DOC can have many important effects on lake trout habitat by alteringphysical, chemical, and biological properties. Maintaining...
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Lake Trout Ecosystems in a Changing Environment - Chapter 10 potx
... 1982). Although Al is abundant in nature,it is relatively insoluble in the neutral pH range and thus unavailable biologically. Acid-neutralizing capacity largely controls pH and the bioavailability ... monomericAl, in comparison to lakes with fish (Gallagher and Baker, 1990).Small, high-elevation lakes in the Adirondacks are more likely to be fishless thanlarger lakes at low elevation (Gallagher and ... naturally acidic lakes — organic anions accountedfor an average of 71% of the total anions in that group of lakes. The acidity of organic-acid-dominated lakes was supplemented by sulfuric acid...
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