. The Canadian field-naturalist. 1990 Notes 289 <3 1970 q 1979 <s 1988 GRAHAM ISLAND. MORESBY IS â ^ Original release site â Secondary release sites \\\ Approximate distribution Figure 1. Geographical distribution of the Pacific Treefrog, Hyla regilla, on the Queen Charlotte Islands, British Columbia. Place names restricted to those used in the text. observed up to 10 km south of Mayer Lake (L. Rennie, personal communication) and by 1978, occurred an additional 30 km to the south. By 1986, I observed them in all of the major watersheds of central and mid-eastern Graham Island. Dispersal
. The Canadian field-naturalist. 1990 Notes 289 <3 1970 q 1979 <s 1988 GRAHAM ISLAND. MORESBY IS â ^ Original release site â Secondary release sites \\\ Approximate distribution Figure 1. Geographical distribution of the Pacific Treefrog, Hyla regilla, on the Queen Charlotte Islands, British Columbia. Place names restricted to those used in the text. observed up to 10 km south of Mayer Lake (L. Rennie, personal communication) and by 1978, occurred an additional 30 km to the south. By 1986, I observed them in all of the major watersheds of central and mid-eastern Graham Island. Dispersal from Mayer Lake also occurred to the east. In 1986, individuals were observed in a narrow corridor up the eastern side of Graham Island, probably as a consequence of access to north-flowing drainage. Presumably, this secon- dary northerly dispersal from Mayer Lake will merge with the easterly front that dispersed north and west from Port Clements (see Figure lc). Between 1975 and 1977, treefrogs were transplanted from roadside ponds in the southeastern region of Graham Island to Queen Charlotte City at the southern edge of Graham Island (K. Moore, personal communication) and by , were heard in roadside ponds up to 30 km northwest. In 1980 or 1981, treefrogs were transplanted (probably from the Port Clements area) to a logging camp near the south-western head of Masset Inlet on Graham Island (M. Dunderdale, personal communication). This population expanded and recently (May 1989) individuals have been observed in sub-alpine ponds 6 km to the west of release site (C. Williamson, personal communication), represent- ing the first sighting of treefrogs on the western slopes of the archipelago. In 1973, five adult treefrogs collected from Port Clements were transplanted to the north-eastern corner of Moresby Island near Sandspit (N. Blount, personal communication). These individu- als formed a successful breeding population and have greatly expanded their range, occurring over
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