Lake Trout Ecosystems in a Changing Environment - Chapter 1 pptx

... 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. ... Precambrian Shield lakes Charles H. Olver, Daniel Nadeau, and Henri Fournier Chapter 12 Lake trout stocking in small lakes: factors affecting success Michael J. Powell and Leon M....

Ngày tải lên: 11/08/2014, 10:21

... 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 ... America, 18 ,000–5,000 years ago Geological Survey of Canada, Map 17 0 3A. Evans, D.O. and Olver, C.H., 19 95, Introduction of lake trout (Salvelinus namaycush) to inland la...

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. ... in Lake Erie in 19 21, in Lake Michigan in 19 36, in Lake Huron in 19 37, and in Lake Superior in 19 38 (Smith and Tibbles, 19 80). By the 1...

Ngày tải lên: 11/08/2014, 10:21

... eggs hatch around March 1, but hatching may occur as early as the end of January or as late as the beginning of April (Chabot and Archambault, 19 81; Pariseau, 19 81) . Lake trout embryos can move ... 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-wate...

Ngày tải lên: 11/08/2014, 10:21

... (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 would be reduced ... C.T., 19 85, Partitioning light attenuation in an acidic lake, Canadian Journal of Fisheries and Aquatic Sciences 42 :17 07 17 11. Evans, D.O., 19 99, Meta...

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 < ;10 0 ha in area, about half the total (63%) of all those lakes Figure 7....

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, ... climatic variability on mixing depths in Canadian Shield lakes, Limnology and Oceanog- raphy 41: 912 –920. Gorham, E., 19 96, Lakes under a three-pronged attack, Nature 3 81: 1...

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., 19 90) and Hg in fish in lakes ... mercury dynamics in Lake Ontario lake trout (Salvelinus namaycush), Canadian Journal of Fisheries and Aquatic Sciences 49: 10 86 10 96. Cabana, G. and Rasmussen, J.B....

Ngày tải lên: 11/08/2014, 10:22

... since that time. We also estimate that past soil base saturation (circa 18 50) was ~20%, stream SO 4 2- concentra- tion was approximately 10 µeq L -1 , stream ANC was about 40 µeq L -1 , stream ... that total atmo- spheric deposition (wet + dry) of S at the HBEF increased from 7 kg SO 4 2- ha -1 yr -1 in 18 50 to a most recent peak of 68 kg SO 4 2- ha...

Ngày tải lên: 11/08/2014, 10:22

... fishermen in 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 19 80 in Nelson Lake, a 308-ha ... comparing winter and open-water lake trout fisheries occurred on Algonquin Park lakes in the late 19 40s and early 19 50s. Martin (19 54) found that in...

Ngày tải lên: 11/08/2014, 10:22