Lake Trout Ecosystems in a Changing Environment - Chapter 7 ppt

... 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 ... Research Board of Canada, 29: 975 –983. (a) (b) Figure 7. 6 Comparison of (a) maximum and (b) mean depths between 1892 lake trout...

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),...

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 ... 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 Shiel...

Ngày tải lên: 11/08/2014, 10:21

... hatchery stocked fish in Michaud Lake began in 1990. A permanent sanctuary status was established for Whitepine Lake in 1980 to prevent angling exploitation. On Michaud Lake a temporary angling ... m mean depth) with a 4 . 7- km shoreline. It has a 328-ha terrestrial catchment area consisting of thin sandy soil over granitic bedrock and has a few small wetland areas. The...

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... 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...

Ngày tải lên: 11/08/2014, 10:21

... 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 1 970 s and in Lake Erie in the late 1980s and early 1...

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

... 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, ... bleaching and removal in lakes increase as water and, hence, DOC residence times increase (Dillon and Molot, 19 97; Schindler et al., 19 97) . Exacerbating the effects of acid rain...

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 ... (Perca flavescens), Water Pollution Research Journal of Canada 28: 2 17 236. Health and Welfare Canada, 1984, Methylmercury in Canada, Volume 2, Health and Welfare Canada, Ot...

Ngày tải lên: 11/08/2014, 10:22

... naturally acidic lakes — organic anions accounted for 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 ... monomeric Al, in comparison to lakes with fish (Gallagher and Baker, 1990). Small, high-elevation lakes in the Adirondacks are more likely to be fishless than larger lakes at low elevation...

Ngày tải lên: 11/08/2014, 10:22