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 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 habi...

Ngày tải lên: 11/08/2014, 10:22

... 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 ... America, 18, 000–5,000 years ago Geological Survey of Canada, Map 170 3A. Evans, D.O. and Olver, C.H., 1995, Introduction of lake trout (Salvelinus namaycush) to inland lakes of...

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... 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. ... of past stockings. Similar increases in lake trout abundance occurred in Lake Ontario in the late 1970s and in Lake Erie in the late 1 980 s and early 1...

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... to 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 virgini...

Ngày tải lên: 11/08/2014, 10:21

... 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 deep-water spawning areas ... occurring after lake trout spawning. Draw- downs occurred before lake spawning on 39 lakes and during spawning on 14 lakes (some lakes had drawdowns occurring at more than one time)...

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 ... m as a result of a twofold increase in atmospheric CO 2 levels. Acidification of lakes by the input of mineral acids also results in increased transparency (Effler et al.,...

Ngày tải lên: 11/08/2014, 10:21

... trout lakes and 436 other non lake trout lakes with available data. Lake 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 ... known lake trout lakes are <100 ha in area, about half the total (63%) of all those lakes Figure 7.5 Distr...

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... 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 ... (Perca flavescens), Water Pollution Research Journal of Canada 28: 217–236. Health and Welfare Canada, 1 984 , Methylmercury in Canada, Volume 2, Health and Welfare Canada, O...

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... 1 982 ). 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 ... and blacknose dace were monitored in streams in the Adirondacks, Catskills, and Appalachian Plateau of Pennsylvania (Wigington et al., 1996). All streams had low ANC values and phys...

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... 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 1 980 in Nelson Lake, a 3 0 8- ha rehabilitated ... 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...

Ngày tải lên: 11/08/2014, 10:22