. The Canadian field-naturalist. 104 The Canadian Field-Naturalist Vol. 104. Figure L Drawing of Golden Redhorse, Moxostoma erythrurum [drawing by Anker Odum, from Scott and Grossman (1973) by permission]. Lee et al. (1980) include the Upper Red River of the North, the Lake of the Woods drainage, and the Roanoke and James drainages on the Atlantic slope. Recently, it has also been found (perhaps introduced) in the Potomac drainage. The Potomac records apparently reflect a new range extension since it is absent from most Atlantic coast streams (Cooper 1983). The range of the Golden Redhorse may


. The Canadian field-naturalist. 104 The Canadian Field-Naturalist Vol. 104. Figure L Drawing of Golden Redhorse, Moxostoma erythrurum [drawing by Anker Odum, from Scott and Grossman (1973) by permission]. Lee et al. (1980) include the Upper Red River of the North, the Lake of the Woods drainage, and the Roanoke and James drainages on the Atlantic slope. Recently, it has also been found (perhaps introduced) in the Potomac drainage. The Potomac records apparently reflect a new range extension since it is absent from most Atlantic coast streams (Cooper 1983). The range of the Golden Redhorse may be expanding westward as well. In Kansas, Clarke and Clarke (1984) have reported it from the Arkansas River 160 km (100 miles) west of previously known localities. Canada: Until recently, in Canada, the Golden Redhorse was believed to be restricted to the drainages of Lake Erie, Lake St. Clair and southern Lake Huron, in southwestern Ontario. Golden Redhorse have been collected from 125 different locations in southwestern Ontario (Figure 3). The majority of the collections, however, have been made from a few major rivers and streams as follows: Catfish Creek, Grand River, Thames River, Nith River, Saugeen River, Sydenham River, Maitland River, and Nanticoke Creek. Scott and Grossman (1973) state that it was present in the Lake Erie system as far east as the Grand River, but not apparently in the Niagara River. More recent evidence suggests it may also be present in the Niagara River drainage in south- central Ontario. A single specimen was collected at the mouth of Miller Creek, near its confluence with the upper Niagara River in 1980 [Royal Ontario Museum, Toronto: ROM 37372]. This is perhaps not surprising as in New York State it is known from many streams draining into the Niagara River as well as in tributaries to Lake Ontario (Smith 1985). Dispersal into southwestern Ontario probably occurred before the arrival of man and was probably limited by temperature and suitable h


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