. The Canadian field-naturalist. 1988 Parker, McKee, and Campbell: Status of Redside Dace 165. Figure 2. North American distribution of the Redside Dace [adapted from Gilbert (1980)]. watersheds. Wainio and Hester (1973) found the species widespread in the Humber River but not in sufficient numbers to be considered common, whereas Parker and McKee (1980) reported that, where captured, the species accounted for 1-78% of all fish caught. Holm and Grossman (1986) found the species occurring in lower frequncies in their 1985 collections. Parker and McKee (1980, 1981) indicated that the species had
. The Canadian field-naturalist. 1988 Parker, McKee, and Campbell: Status of Redside Dace 165. Figure 2. North American distribution of the Redside Dace [adapted from Gilbert (1980)]. watersheds. Wainio and Hester (1973) found the species widespread in the Humber River but not in sufficient numbers to be considered common, whereas Parker and McKee (1980) reported that, where captured, the species accounted for 1-78% of all fish caught. Holm and Grossman (1986) found the species occurring in lower frequncies in their 1985 collections. Parker and McKee (1980, 1981) indicated that the species had undergone a serious population decline based on their surveys and a review of the literature carried out in 1979-80. Collection of Redside Dace from Pringle, Lynde, Highland, Etobicoke, Twelve Mile, and Welland creeks as well as the Don and Nith rivers had not been made in over twenty years. The species had been known from Sixteen Mile Creek as recently as 1975 but was not collected in 1979 (Parker and McKee 1980). Based on this evidence and the general failure to collect the species in many streams where it once occurred Parker and McKee (1981) suggested that Ontario populations were threatened. Reduced populations levels could also be partially attributable to sampling technique as the species utilizes a habitat that might easily be overlooked during sampling. For instance, during the OMNR surveys of the Humber River in 1972, one survey team found the species at only two locations while a second team found it to be widespread throughout the watershed (Wainio and Hester 1973). Because of the uncertainties as to the status of the Redside Dace in Ontario, further surveys were conducted by E. Holm and E. J. Grossman of the Royal Ontario Museum (ROM) in 1985. These surveys were carried out in and around known areas of distribution in an attempt to determine the present status. This involved not only field surveys in 1985 but also a complete review and check of the documentation o
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