. The Canadian field-naturalist. 1966 Thomas: Benthos of Lake Superior Bays 201 I- BATCHAWANA BAY 2-GOULAIS BAY 3-MOUNTAIN BAY 4-PIGEON BAY. Figure 1. Lake Superior showing the location of the four bays in which collections were made. Pigeon Bay at the Canadian-United States border at the west end of Lake Superior is cold, deep and narrow. Much of the bay is over 30 m deep but sampling was mainly confined to shallower parts. Water temperatures are low, only the upper few meters ever rising above 10°C. Bottom deposits are mainly soft brown mud but granite outcroppings occur. The Fauna Collected
. The Canadian field-naturalist. 1966 Thomas: Benthos of Lake Superior Bays 201 I- BATCHAWANA BAY 2-GOULAIS BAY 3-MOUNTAIN BAY 4-PIGEON BAY. Figure 1. Lake Superior showing the location of the four bays in which collections were made. Pigeon Bay at the Canadian-United States border at the west end of Lake Superior is cold, deep and narrow. Much of the bay is over 30 m deep but sampling was mainly confined to shallower parts. Water temperatures are low, only the upper few meters ever rising above 10°C. Bottom deposits are mainly soft brown mud but granite outcroppings occur. The Fauna Collected Most of the fauna collected was identified. Table 1 lists all species or groups determined and shows the number of stations in each general locality at which they were taken. Where the total number of specimens of each species for each locality was recorded this is also presented. As sampling was not quantitative numbers indicate only relative abundance. Complete details of sampling stations and specimens collected are reported elsewhere (Thomas, 1965). Table 1 is self-explanatory; the following notes are limited to ecological information and special situations. ANNELIDA : HIRUDINEA Among the annelids only the Hirudinea have been identified; oligochaetes were frequent in many of the collections. Distribution of some leeches was correlated with depth. All species were most common in relatively shallow water, none being taken at deeper than 30 m. Erpobdella punctata was taken only in shore collections in the eastern bays. Haemopis grandis was not found in over 9 m, and most frequently taken. 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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