. Montana amphibian and reptile status assessment, literature review, and conservation plan. Amphibians; Reptiles; Indicators (Biology); Habitat (Ecology); Wildlife conservation. American Bullfrog (Rana catesbeiana) Up-to-date distribution and status information can be found on the Montana Natural Heritage Program's TRACKER website at EXOTIC SPECIES. Distribution/Taxonomy The bullfrog is recognized as a distinct species with a native range east of a line extending from northwest Wisconsin to south central Texas (Bury and Whelan 1984; Wiese 1990). However, they have now been widely in
. Montana amphibian and reptile status assessment, literature review, and conservation plan. Amphibians; Reptiles; Indicators (Biology); Habitat (Ecology); Wildlife conservation. American Bullfrog (Rana catesbeiana) Up-to-date distribution and status information can be found on the Montana Natural Heritage Program's TRACKER website at EXOTIC SPECIES. Distribution/Taxonomy The bullfrog is recognized as a distinct species with a native range east of a line extending from northwest Wisconsin to south central Texas (Bury and Whelan 1984; Wiese 1990). However, they have now been widely introduced throughout the western United States and around the world at elevations that are typically lower than 1,900 M (6,234 ft) (Bury and Whelan 1984). They were first introduced in Montana sometime prior to 1968 and have now been documented with an almost continuous distribution in the valley bottoms along the Bitterroot River downstream of Darby, the Clark Fork River downstream of Missoula, and the Flathead River downstream of Dixon (Black 1969a, \969b; Werner and Reichel 1994; Reichel 1995a; Hendricks and Reichel 1996b; Werner et al. 1998; Bryce Maxell, pers. obs.). In addition reproducing populations have been reported in Laurel, Billings, and Fort Peck, and individual adults have been reported in Helena, Belgrade, near Silver City northwest of Helena, near Lake Koocanusa near the Canadian border and in Carter County. Maximum Elevation 1,203 m (3,946 ft) in Flathead County (Werner et al. 2004). Identification Eggs: Deposited in a thin film, a few eggs thick, containing from 3,000 to 47,840 eggs, and spread out over a large surface area (Howard 1983; McAuliffe 1978 as cited in Bury and Whelan 1984; Bryce Maxell, pers. obs.). Each ovum is black above, whitish below, and is surrounded by a single jelly layer (Bryce Maxell, pers. obs.). Ovum diameters are mm, but, total egg 262. Please note that these images are extracted from scanned page images that may have been di
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Keywords: ., booksubjectamphibians, booksubjectreptiles, booksubjectwildlifec
