. The Canadian field-naturalist. 16 The Canadian Field-Naturalist Vol. 87. Figure 1. Capture locations of Manitoba specimens of Napaeozapiis: \. Caddie Lake (Soper, 1937) 2. Cedar Lake (Soper, 1938) 3. Forbes Lake (Buckner, collection number 159). 4. Whiteshell Nuclear Research Establishment. lation means. Only 5 young, ranging in weight from g, were captured. Natural History Males were in reproductive condition in late May and early June, as evidenced by testis lengths and positive epididymal smears. By July, testis lengths had decreased and fewer sperm were present. Only 2 females
. The Canadian field-naturalist. 16 The Canadian Field-Naturalist Vol. 87. Figure 1. Capture locations of Manitoba specimens of Napaeozapiis: \. Caddie Lake (Soper, 1937) 2. Cedar Lake (Soper, 1938) 3. Forbes Lake (Buckner, collection number 159). 4. Whiteshell Nuclear Research Establishment. lation means. Only 5 young, ranging in weight from g, were captured. Natural History Males were in reproductive condition in late May and early June, as evidenced by testis lengths and positive epididymal smears. By July, testis lengths had decreased and fewer sperm were present. Only 2 females were caught in June. One was in an early stage of pregnancy, whereas the other had already lit- tered. Small embryos were recorded in an early July specimen, indicating littering occurred until at least mid-July. No young animals were in reproductive condition. These data suggest only one litter per year, with young animals not breeding during the summer of birth. Capture dates indicate a short period of activity for Manitoba Napaeozapus. No animals were captured during the last 2 weeks of April. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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