Lake Trout Ecosystems in a Changing Environment - Chapter 9 ppsx

... 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., 199 0) 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. ( 199 3). Lakes with pro- portionately larger catchment ar...

Ngày tải lên: 11/08/2014, 10:22

... open-water lake trout fisheries occurred on Algonquin Park lakes in the late 194 0s and early 195 0s. Martin ( 195 4) found that in lakes where lake trout mature at a young age (5 years) and a small ... since 199 1 in Clearwater Bay and adjacent Echo Bay and Cul de Sac, Lake of the Woods, Ontario, to curtail the harvest of trophy-size lake trout (Mosindy, 199 8). Catch...

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... 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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... Superior basin, and finally eastward into Lake Barlow-Ojib - way (Mandrak and Crossman, 199 2). Lake Barlow-Ojibway extended across northeastern Ontario and northwestern Quebec, and drained into the ... demonstrated that thermal characteristics of utilized habitats can vary considerably among lakes (Sellers et al., 199 8). Similarly, Snucins and Gunn ( 199 5) have shown that lake...

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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 197 0s and in Lake Erie in the late 198 0s and early 1...

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... 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 ... the many factors affecting lake trout s adaptation in reservoirs (Machniak, 197 5; Evans et al., 199 1). Among the foregoing factors, drawdown is often pinpointed as the cause of the...

Ngày tải lên: 11/08/2014, 10:21

... variability on mixing depths in Canadian Shield Lakes, Limnology and Oceanog- raphy 41 :91 2 92 0. France, R., 199 7, Land−water linkages: influences of riparian deforestation on lake thermocline ... 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...

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... maximum and (b) mean depths between 1 892 lake 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 ... concentration distributions in 293 lake trout lakes and 92...

Ngày tải lên: 11/08/2014, 10:22

... bleaching and removal in lakes increase as water and, hence, DOC residence times increase (Dillon and Molot, 199 7; Schindler et al., 199 7). Exacerbating the effects of acid rain and climate warming ... 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 (...

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... Catskills, and Appalachian Plateau of Pennsylvania (Wigington et al., 199 6). All streams had low ANC values and physical habitats judged suitable for fish survival and reproduction, and all had ... and were assumed to be 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 supple...

Ngày tải lên: 11/08/2014, 10:22