File:The Canadian field-naturalist (1973) (20511786742).jpg

Title: The Canadian field-naturalist
Identifier: canadianfieldnat1973otta (find matches)
Year: 1973 (1970s)
Authors: Ottawa Field-Naturalists' Club
Subjects:
Publisher: Ottawa, Ottawa Field-Naturalists' Club
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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410 The Canadian Field-Naturalist Vol. 87 HUDSON BAY JAMES BAY^^O
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Figure 1. Map of northern Ontario showing some localities mentioned in the text. alder-willow forest with larger, deeper (1.5 m) ponds. Winisk Camp (22-28 June 1971). This camp is 4.8 km east of Winisk on the southeast shore of the Winisk River less than 1 mile from Hudson Bay. Peat tundra there, both dry and marshy, is dotted with many ponds, and is locally much disturbed by activities associated with the now-abandoned Winisk Royal Canadian Air Force Base. Winisk (28 June-5 July 1971). The town is on the elevated west bank of the Winisk River, surrounded by dense willow-birch (Betula sp.) and spruce-tamarack thickets. There are several large ponds near the town. Species Accounts American Toad. Bufo americanus. Abundant at Moosonee, Whitetop Creek, and Attawa- piskat. On 26 May 1972 we saw several aggre- gations of toads swimming in ditches along the Ontario Northland Railway right-of-way be- tween Cheepas River and Moosonee. Toads were breeding at Moosonee on 14 June 1971 and 26-27 May 1972, and at Whitetop Creek on 12-14 June 1971 and 1-2 June 1972. On these nights amplexing pairs, newly-laid eggs, and tadpoles were abundant in shallow ponds in open areas. Few or no toads were calling on the cold nights of 28-31 May 1972. We took newly-hatched tadpoles in Moosonee on 5 June 1972 and saw no eggs or amplexing pairs that night, although many males were calling vigor- ously. Near the Whitetop Creek camp toads laid eggs in ponds that tasted brackish in 1971, but that were more or less fresh in 1972. Karlstrom (1966) noted that Bufo boreas in Valdez, Alaska bred in brackish beach ponds. It may be that the fresh water in some northern areas is so pure that lack of salts limits tadpole growth or development, and that the higher ion

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