. The Canadian field-naturalist. 1976 Williams and Williams: Faunas of Brackish-Water Pools, Quebec 411 ^. 0 Amory p Cove IMI Sand Scale: h 300nn Gulf of St Lawrence Figure L Map of sampling area. Locations of individual rock pools are marked with the letters A to N. conditions are favorable. They have been formed mostly in depressions or fissures in the rock and whereas surface area varies from approximately 2 m^ to 6 m-, their depths are all close to 20 cm. The pool bottoms consist of bare rock covered with patches of sand and mud. The flora is dominated by algae ranging from Cladophora and
. The Canadian field-naturalist. 1976 Williams and Williams: Faunas of Brackish-Water Pools, Quebec 411 ^. 0 Amory p Cove IMI Sand Scale: h 300nn Gulf of St Lawrence Figure L Map of sampling area. Locations of individual rock pools are marked with the letters A to N. conditions are favorable. They have been formed mostly in depressions or fissures in the rock and whereas surface area varies from approximately 2 m^ to 6 m-, their depths are all close to 20 cm. The pool bottoms consist of bare rock covered with patches of sand and mud. The flora is dominated by algae ranging from Cladophora and some blue-green algae in the less saline pools, to Pelvetia, Cladophora, Enteromorpha, and Ectocarpus in the more saline ones. Only two vertebrates are commonly encountered in these pools, the toad, Biifo americanus Holbrook, and the three-spine stickleback, Gasterosteus aculeatus L. For a detailed description of the latter species in these habitats see Coad and Power (1973). Materials and Methods After some preliminary observations were made in the summer of 1971, faunal samples were collected from representative parts of each of 14 rock pools during late July 1974. Two samples were taken from each pool with the aid of a 135-yu mesh dip net, and a 3-min sampling period served to standardize the collecting method. The samples were preserved in 5% formalin and later the animals were separated from the sediment by a flotation technique (Hynes 1961). Representatives of the various taxa present were then hand-picked under a binocular microscope and identified. No at- tempt was made to quantify the animals col- lected other than to rate each species on a scale of. 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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