. The Canadian field-naturalist. 1984 Parker and McKee: Status of the Spotted Sucker 105. Figure I. Spotted Sucker (Minytrema melanops). Courtesy of D. E. McAllister, National Museum of Natural Sciences. Habitat In Canada, the Spotted Sucker has been captured in lake and sluggish river environments. Trautman (1957) noted that this species has been captured in lakes, rivers, , sloughs and streams in Ohio. Elsewhere, it has been collected in all types of slow flowing water bodies from intermittent streams to large lakes and impoundments (Douglas 1974). Bottom substrates at Spotted Sucker
. The Canadian field-naturalist. 1984 Parker and McKee: Status of the Spotted Sucker 105. Figure I. Spotted Sucker (Minytrema melanops). Courtesy of D. E. McAllister, National Museum of Natural Sciences. Habitat In Canada, the Spotted Sucker has been captured in lake and sluggish river environments. Trautman (1957) noted that this species has been captured in lakes, rivers, , sloughs and streams in Ohio. Elsewhere, it has been collected in all types of slow flowing water bodies from intermittent streams to large lakes and impoundments (Douglas 1974). Bottom substrates at Spotted Sucker capture sites in Ontario range from hard clays to sand, gravel, and rubble. Pflieger (1975) reported this species was found over soft organic bottoms, but it is generally consi- dered to prefer firm to hard substrates (Cross 1967; Gilbert and Burgess 1980). The Spotted Sucker has been reported from water bodies with dense aquatic macrophyte growths (Cross 1967); however, records from Canadian collections of this species lack habitat data and the relationships between this species and aquatic macrophytes cannot be substantiated. The Spotted Sucker prefers clear, warm waters where turbidity is minimal (Trautman 1957). This species has been captured in the East Sydenham River where turbidity is moderate to heavy (Secchi disc approximately 45 cm). The Spotted Sucker is more tolerant to siltation than some other catostomids, especially if siltation is only intermittently heavy (Miller and Robinson 1973). Trautman (1957) stated that this species was found in water bodies where siltation was extremely low. He suggested that the closely-bound gill covers in this species make it toler- ant to turbid waters, pollutants and flocculent clay silt substrates. Cross (1967) suggested that the habitat of the Spotted Sucker was especially vulnerable to unfa- vourable change (mainly siltation) because of inten- sive cultivation along low gradient streams that are preferred by this species. Oxygen
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