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, leaving other areas of the lake unstocked. ... obstacles faced by lake trout in the Great Lakes. Approximately 33 0 million yearling and fingerling lake trout were released into the Great Lakes from 1950 to...

Ngày tải lên: 11/08/2014, 10:21

... 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 ... Burnham-Curtis, M.K., 19 93, Intralacustrine speciation of Salvelinus namaycush in Lake Superior: an investigation of genetic and morphological variation and evolution of lake...

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... Molot, L .A. , 20 03, Predicting optimal habitat boundaries for lake trout (Salvelinus namaycush Walbaum) in Canadian Shield lakes, Canadian Journal of Fisheries and Aquatic Sciences (in press). Dillon, ... organisms, leading Gorham (1996) to declare that lakes are under a “three-pronged attack” (Figure 8.7). In summary, DOC can have many important effects on lake trout habit...

Ngày tải lên: 11/08/2014, 10:22

... 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),...

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... in 85 lake trout lakes. A large number (50) of these lakes had drawdowns occurring after lake trout spawning. Draw- downs occurred before lake spawning on 39 lakes and during spawning on 14 lakes ... 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 the artificial de...

Ngày tải lên: 11/08/2014, 10:21

... 1-m increase in transparency would result in an increase in Z 10 of ca. 1 m. Following a 2-m increase in transparency, optimal habitat volumes in the same lakes would be reduced by between 8 and ... temperature boundaries and thus define usable lake trout habitat, or any other class of habitat. A 0 © 2004 by CRC Press LLC chapter six Lake trout (Salvelinus namaycush...

Ngày tải lên: 11/08/2014, 10:21

... Trout lakes Non -Lake Trout Lakes Maximum Depth (m) 0-1 0 1 0-2 0 2 0 -3 0 3 0-4 0 4 0-5 0 5 0-6 0 6 0-7 0 7 0-8 0 8 0-9 0 9 0-1 00 10 0-1 10 50 40 30 20 10 0 Percent of Lakes Lake Trout lakes Non -Lake Trout Lakes Mean ... of lake trout lakes in the smallest size category (<25 ha) than is the case for all lakes in the database (34 %). More tha...

Ngày tải lên: 11/08/2014, 10:22

... pollutants may be increasing Hg concentrations in lake trout in small Boreal lakes. Experimental lake acidification was observed to increase Hg in fish (Wiener et al., 1990) and Hg in fish in lakes ... to lake area in a study where the ratio of catchment to lake area was not kept constant as in Bodaly et al. (19 93) . Lakes with pro- portionately larger catchment are...

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... increased and ANC decreased during fall, coinciding with increased flow and decreased plant activity. Nitrate concentrations increased and ANC values decreased during winter, with maximum NO 3 - ... 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 bi...

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... open-water lake trout fisheries occurred on Algonquin Park lakes in the late 1940s and early 1950s. Martin (1954) found that 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 and applying it to their seasonal or annual quota. An individual tag-and-quota system for lake...

Ngày tải lên: 11/08/2014, 10:22