. The Canadian field-naturalist. 1988 Parker, McKee, and Campbell: Status of Redside Dace 167 â RCM ⦠Cntario Ministxy of Natural Resources ⢠Ontario Ministry of the E^virorment * Uni\«rsity of Ttironto. Figure 4. Collection records of Clinostomus elongatus in Ontario 1980-1985. There is no evidence that Clinostomus elongatus occurs any longer in Welland or Lincoln counties. The Kettleby Creek (Lake Simcoe drainage) population appears stable as does the Irvine Creek group in the headwaters of the Grand River (Holm and Crossman 1986). The Gully and Meux creek populations of the Lake Huron sy
. The Canadian field-naturalist. 1988 Parker, McKee, and Campbell: Status of Redside Dace 167 â RCM ⦠Cntario Ministxy of Natural Resources ⢠Ontario Ministry of the E^virorment * Uni\«rsity of Ttironto. Figure 4. Collection records of Clinostomus elongatus in Ontario 1980-1985. There is no evidence that Clinostomus elongatus occurs any longer in Welland or Lincoln counties. The Kettleby Creek (Lake Simcoe drainage) population appears stable as does the Irvine Creek group in the headwaters of the Grand River (Holm and Crossman 1986). The Gully and Meux creek populations of the Lake Huron system would also appear to be holding their own although these populations may be the most vulnerable. Parker and McKee (1980, 1981) cited records of the species in the Teeswater River of the Saugeen drainage and suggested that the disjunction of the species in Ontario is indicative of a species that was once more widespread. Gilbert (1980) and Trautman (1981) stated that the Redside Dace had disappeared from many areas in the United States where it once occurred and Greene (1935) suggested that the species was moving to extinction. Previous ODPD records also reported the species in the headwaters of the Saugeen but they are not there now (Holm and Crossman 1986). Usually a species may survive in the headwaters of a system even after they have been decimated or extirpated from mid- or lower sections if the headwater habitat is still suitable. The recent surveys indicate that many of the populations in Ontario are approaching this point. However adult and juvenile specimens were collected in the recent studies indicating the continued existence of reproducing populations. Yet, the increasingly discontinuous distribution of this species in Ontario indicates that the Redside Dace is becoming less common. Deleterious alteration of natural stream habitat by urbaniza- tion, industry and agriculture in Lake Ontario watersheds threaten the continued existence of this species in C
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