Great Lake Manitoulin: Georgian Bay and the North Channel

Hydrobiologia ◽  
1988 ◽  
Vol 163 (1) ◽  
pp. 1-19 ◽  
Author(s):  
P. G. Sly ◽  
M. Munawar
Keyword(s):  
Great Lake ◽  
Georgian Bay ◽  
The North

Chemical limnology of Georgian Bay and the North Channel between 1974 and 1980

Hydrobiologia ◽  
1988 ◽  
Vol 163 (1) ◽  
pp. 77-83 ◽  
Author(s):  
R. R. Weiler
Keyword(s):  
Georgian Bay ◽  
The North

The benthic macro-algae of Georgian Bay, the North Channel and their drainage basin

1988 ◽  
pp. 141-148 ◽  
Author(s):  
Robert G. Sheath ◽  
Julie A. Hambrook ◽  
Christopher A. Nerone
Keyword(s):  
Drainage Basin ◽  
Georgian Bay ◽  
The North ◽  
Macro Algae

Gravitational oscillations of Lake Huron, Saginaw Bay, Georgian Bay, and the North Channel

1977 ◽  
Vol 82 (15) ◽  
pp. 2105-2116 ◽  
Author(s):  
David J. Schwab ◽  
Desiraju B. Rao
Keyword(s):  
Lake Huron ◽  
Saginaw Bay ◽  
Georgian Bay ◽  
The North

Revision of the position of the Ordovician–Silurian boundary in southern Ontario: regional chronostratigraphic implications of δ13C chemostratigraphy of the Manitoulin Formation and associated strata

2011 ◽  
Vol 48 (11) ◽  
pp. 1447-1470 ◽  
Author(s):  
Stig M. Bergström ◽  
Mark Kleffner ◽  
Birger Schmitz ◽  
Bradley D. Cramer
Keyword(s):  
Middle Part ◽  
Adjacent Region ◽  
Geologic History ◽  
Southern Ontario ◽  
Georgian Bay ◽  
The North ◽  
Head Formation ◽  
Depositional Patterns ◽  
Baseline Values ◽  
Anticosti Island

δ13C values of 142 samples from the Manitoulin Formation and subjacent strata collected from 14 exposures and two drill-cores on Manitoulin Island, Bruce Peninsula, and the region south of Georgian Bay suggest that the Manitoulin Formation is latest Ordovician (Hirnantian) rather than earliest Silurian in age. A δ13C excursion identified as the Hirnantian isotope carbon excursion (HICE), which has a magnitude of nearly 2.5‰ above baseline values, is present in an interval from the upper Queenston Formation to the lower to middle part of the Manitoulin Formation in most of Bruce Peninsula and in the area south of Georgian Bay, whereas on Manitoulin Island the HICE appears to be absent. This indicates that a significant part of the Manitoulin Formation is older on the Bruce Peninsula and in its adjacent region than on Manitoulin Island. The chemostratigraphically based conclusions are consistent with biostratigraphic data from conodonts and brachiopods. The Hirnantian δ13C curve from Anticosti Island, Quebec is closely similar to those of southern Ontario. Traditionally, the Ordovician–Silurian boundary has been placed at the base of the Manitoulin Formation, but the new results suggest that it is more likely to be at, or near, the base of the overlying Cabot Head Formation. These new results have major implications for the interpretation of the geologic history and marine depositional patterns of the latest Ordovician of a large part of the North American Midcontinent.

Lake Huron: Effects of Exploitation, Introductions, and Eutrophication on the Salmonid Community

1972 ◽  
Vol 29 (6) ◽  
pp. 877-887 ◽  
Author(s):  
A. H. Berst ◽  
G. R. Spangler
Keyword(s):  
Water Quality ◽  
Fishery Management ◽  
Management Practices ◽  
Quality Criteria ◽  
Sea Lamprey ◽  
Lake Huron ◽  
Water Quality Criteria ◽  
Saginaw Bay ◽  
Georgian Bay ◽  
The North

Lake Huron is a large, deep, oligotrophic lake, centrally located in the St. Lawrence Great Lakes system. Manitoulin Island and the Bruce Peninsula divide the lake into the relatively discrete water masses of the North Channel, Georgian Bay, and Lake Huron proper. Water quality in Lake Huron has deteriorated only slightly since the early 1800s. The only significant changes are confined to areas adjacent to centers of human activity, chiefly Saginaw Bay and various harbours and estuaries in Georgian Bay and the North Channel. The lake has supported a commercial fishery which has produced annual catches as high as 13000 metric tons. A dramatic decline in landings of commercially valuable species and an instability in fisheries resources has occurred in all areas of the lake since the 1940s. This depression of populations of valued species was associated with the accidental introduction of the sea lamprey, instances of overfishing and deterioration of water quality in Saginaw Bay. The present depressed state of the fisheries will undoubtedly persist until sea lamprey control is achieved and climax predators are reestablished. Governments are proceeding toward the establishment of water quality criteria and fishery management practices which, hopefully, will stabilize the fisheries and prevent further deterioration of the aquatic environment.

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