. The Canadian field-naturalist. Natural history. 2. 1. 0 Annelida Y = X + r2 = p> Hydracarina Y = X + m r2 = p> 0 10 20 30 40 50 60 70 80 90 Day of winter Figure 3. Regression plot of the number of aquatic invertebrates in six different orders found on the substrate (organisms / cm2) on different days from 16 December 1998 to 8 March 1999 in the Grand River, Ontario. 1990). Mean freeze-over dates, mean ice thickness, surface ice cover until spring break-up (Prowse and mean ice-free dates are provided by Allen 1995). This occur
. The Canadian field-naturalist. Natural history. 2. 1. 0 Annelida Y = X + r2 = p> Hydracarina Y = X + m r2 = p> 0 10 20 30 40 50 60 70 80 90 Day of winter Figure 3. Regression plot of the number of aquatic invertebrates in six different orders found on the substrate (organisms / cm2) on different days from 16 December 1998 to 8 March 1999 in the Grand River, Ontario. 1990). Mean freeze-over dates, mean ice thickness, surface ice cover until spring break-up (Prowse and mean ice-free dates are provided by Allen 1995). This occurs in the northern part of the coun- (1977) and reviewed by Prowse (1990). In many of try, and much of the prairie provinces (Beltaos the colder parts of Canada, streams have a short 1997). In more moderate areas of Canada, such as freeze-up period followed by a fairly stable period of the southern parts of Ontario, Quebec, and British. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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