Карта острова, 1999 год
English: Title: The Canadian field-naturalist Identifier: canadianfieldnat113otta (find matches) Year: 1919 (1910s) 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 View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: 482 The Canadian Field-Naturalist Vol. 113 Text Appearing After Image: Figure 1. The study area. Banks Island, Northwest Territories. All hares were collected in upland habitats during travel between Sachs Harbour, Camp Coyote and Camp Bernard. caused by increased cropping of willows during winter, could affect the Caribou population. The potential impact of small mammal herbivory on the dynamics of forage availability has largely gone unreported. In the present communication I: (1) document sea- sonal changes in the diet of Arctic Hares on Banks Island obtained by analysing plant fragments in fae- ces and the stomach, (2) assess differential digestibility of forage groups on a seasonal basis by comparing plant fragments found in the faeces and the stomach, and compare my findings with those of Klein and Bay (1995), and (3) discuss the potential impact hares may have on forage availability for other resident herbivores of Banks Island. Botanical nomenclature follows Hulten (1990). Study Area Banks Island is the most western island in the Canadian Arctic Archipelago and covers an area of approximately 70 000 km- (Figure 1). The climate is Arctic maritime along coastal areas where weather stations are located, tending toward Arctic desert inland. Winters are long, mean monthly temperatures are below 0°C from September through May, and cold, mean minimum daily temperatures range from -30° to ^0°C from December to March. Summers are short and cool, mean maximum daily tempera- tures range from 5° to 10°C from June through August. Precipitation is low with an annual mean of 9 cm (Zoltai et al. 1980*). Sachs Harbour is the only permanent settlement on the Island (71° 59' N, 125° 17' W), with a population of 125. Habitat types have been adapted from Kevan (1974), Wilkinson et al. (1976), and Ferguson (1991). There are four major terrestrial habitats: (1) wet-sedge meadow; (2) upland barren; (3) hummock tundra; and (4) stony barren. Wet-sedge meadows generally are level hydric lowlands characterized by Water Sedge (Carex aquatilis). Cotton Sedge (Eriophorum scheuchzeri), and Tundra Grass (Dupontia fisheri). Upland barrens are moist well-drained sites occurring on the upper and middle parts of slopes. Vegetation is dominated by Mountain Avens (Dtyas integrifoUa) and Arctic Willow (Salix arctica) with legumes and a variety of forbs also present. Hummock tundra occurs oti moderately steep slopes characterized by individual hummocks, which are vegetated primarily by dwai'f shrubs including Mountain Avens, Arctic Willow and Arctic Heather (Cassiope tetragona); legumes and a variety of forbs are also present. Stony barrens are sparsely vegetated (< 10% cover) with a coarse gravelly substrate. This habitat is located on wind-blown areas, ridges, gravel and sand bars. Note About Images 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 work.