Lake Trout Ecosystems in a Changing Environment - Chapter 2 doc

... Superior basin, and finally eastward into Lake Barlow-Ojib - way (Mandrak and Crossman, 19 92) . Lake Barlow-Ojibway extended across northeastern Ontario and northwestern Quebec, and drained into the ... et al. (1980); glacial refugia from Crossman and McAllister (1986). © 20 04 by CRC Press LLC and glacial lakes also drained into Lake Agassiz from the west, facilitating immigr...

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. ... This lake has the least lake trout habitat of any of the Great Lakes, and suitable waters are restricted to the eastern basin of the lake. Lake Erie was the last...

Ngày tải lên: 11/08/2014, 10:21

... 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 habitat by altering physical, ... chemical, and biological properties. Maintaining the long-term integrity of lake trout habitat will require the management of activities in the catchments of lakes that affect DO...

Ngày tải lên: 11/08/2014, 10:22

... dominated by jack pine (Pinus 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 ... Gunn (20 02) . 0 5 10 15 20 25 05-May 30-May 24 -Jun 19-Jul 13-Aug 07-Sep 0 2- Oct 27 -Oct Body Temperatures (°C) Gullrock Lake Michaud Lake © 20 04 by CRC Press LLC of cha...

Ngày tải lên: 11/08/2014, 10:21

... spawning areas in the littoral zones of Lake aux Sables using a tarp (Benoît and Legault, 20 02) led lake trout to abandon these areas and reproduce in the artificial deep-water spawning areas ... 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 dur...

Ngày tải lên: 11/08/2014, 10:21

... al. (in press) calculated that a 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 ... epilimnia in smaller lakes to increase in thickness by 1 to 2 m as a result of a twofold increase in atmospheric CO 2 levels. Acidification of lakes by the input of...

Ngày tải lên: 11/08/2014, 10:21

... Ontario. 40 30 20 10 0 0 -2 4-6 8-1 0 1 2- 1 4 1 6-1 8 2 0 -2 2 2 4 -2 6 2 8-3 0 Total Phosphorus (µg/L) 25 20 15 10 5 0 Lake Trout lakes Non -Lake Trout Lakes 10 0-1 50 15 0 -2 00 20 0 -2 50 25 0-3 00 30 0-3 50 35 0-4 00 40 0-4 50 45 0-5 00 50 0-5 50 55 0-6 00 >600 Percent ... trout lakes and 436 other non lake trout lakes with a...

Ngày tải lên: 11/08/2014, 10:22

... (Perca flavescens), Water Pollution Research Journal of Canada 28 : 21 7 23 6. Health and Welfare Canada, 1984, Methylmercury in Canada, Volume 2, Health and Welfare Canada, Ottawa, Ontario. Hesslein, ... 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...

Ngày tải lên: 11/08/2014, 10:22

... in 1973 and has decreased since that time. We also estimate that past soil base saturation (circa 1850) was ~20 %, stream SO 4 2- concentra- tion was approximately 10 µeq L -1 , stream ANC was ... concentrations increased and ANC values decreased during winter, with maximum NO 3 - concentrations and minimum ANC values occurring during spring snowmelt. Seasonal increases in NO...

Ngày tải lên: 11/08/2014, 10:22

... anglers using bait fish. Lakes with an abundance of small lake trout (usually the smaller lakes) may attract more anglers and have greater effort on a per-unit-area basis than other lakes because ... 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 trout ha...

Ngày tải lên: 11/08/2014, 10:22