Lake Trout Ecosystems in a Changing Environment - Chapter 11 ppsx

... 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

... 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. (1993). Lakes with pro- portionately larger catchment areas...

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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),...

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 ... 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 Ca...

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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. ... obstacles faced by lake trout in the Great Lakes. Approximately 330 million yearling and fingerling lake trout were released into the Great Lakes from 1950 to 2...

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 ... 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

... maximum and (b) mean depths between 1892 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 927 lak...

Ngày tải lên: 11/08/2014, 10:22

... 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, ... long-term integrity of lake trout habitat will require the management of activities in the catchments of lakes that affect DOC inputs to lakes. Climate change and acid rain als...

Ngày tải lên: 11/08/2014, 10:22

... 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 ... 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 elev...

Ngày tải lên: 11/08/2014, 10:22