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Author
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editScreen
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palette
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ASYM_HyperPath
ASYM_AutoHotwords
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---Intilization handlers
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initializeSystemVariables
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linkDLL "TB40WIN.
INT horizontalDisplayRes()
verticalDisplayRes()
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DisplayBitsPerPixel()
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discover
saguenay
saguenay
oak savannah
karner blue
state\figures\18_2_l.bmp
state\figures\oaksav1.bmp
state\figures\karner.bmp
scroll up
save page
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page number
page number
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page number
page number
tbk_backdrop
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Save this screen in file
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save page
c:\grtlakes.doc
buttonClick
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---
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*ClassTbl*
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box 6.6
Savannah
Oak savannah and tall-grass prairie are two of the most threatened vegetation types in North America. In Canada, oak savannah is indigenous only to the Carolinian Zone, in the very southern part of Ontario In the 1700s, these vegetation types covered 2.4% of southern Ontario; today, they amount to less than 0.1%. The disappearance of these ecosystems was at first the result of their suitability for agriculture and of the deliberate suppression of grass fires. Later, residential and commercial development and invasion by exotic species became contributing factors. Destruction and degradation of these habitats led to the decline of species associated with them (e.g., Frosted Elfin and Karner Blue butterflies, and others).
Walpole Island now contains the most significant tall-grass prairie and oak savannah in Canada, maintained by communal efforts (including deliberate, large-scale burning) of the Walpole Island First Nation. The preservation of this valuable habitat attests to the strengths of traditional knowledge and environmental stewardship still practised by this First Nation.
Other areas of prairie and oak savannah habitat are found at Pinery Provincial Park on Lake Huron and Ojibwa Park in Windsor. Elsewhere in southern Ontario, the degradation of the few remaining sites is such that rehabilitation is necessary. Seeds are being collected, research is being carried out, and projects to rehabilitate prairie and savannah habitat have begun on Long Point and Pinery provincial parks, in Point Pelee National Park, on private land, and, somewhat controversially, in High Park in Toronto.
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