. The Canadian field-naturalist. 1984 BOONSTRA AND SINCLAIR: DISTRIBUTION AND HABITAT OF CARIBOU AND MOOSE 13. THUTAOE LAKE Figure I, The Spatsizi area in northern British Columbia (from Surveys and Mapping Branch, Lands Service, 1976 edition). total precipitation is not high (550 mm) and it is spread fairly evenly through the year. The lowest pre- cipitation occurs in March-June. There is a gradient of temperature and precipitation in the area, with the warmest and driest parts being in the north and north-east along the lower Stikine and Spatsizi Rivers. The snow cover here is 30-50 cm
. The Canadian field-naturalist. 1984 BOONSTRA AND SINCLAIR: DISTRIBUTION AND HABITAT OF CARIBOU AND MOOSE 13. THUTAOE LAKE Figure I, The Spatsizi area in northern British Columbia (from Surveys and Mapping Branch, Lands Service, 1976 edition). total precipitation is not high (550 mm) and it is spread fairly evenly through the year. The lowest pre- cipitation occurs in March-June. There is a gradient of temperature and precipitation in the area, with the warmest and driest parts being in the north and north-east along the lower Stikine and Spatsizi Rivers. The snow cover here is 30-50 cm in depth. In the higher mountain ranges south- west, precipitation is higher and snow cover is 150- 200 cm. The southeast of the Spatsizi Park and Tatla- tui Park are higher and therefore colder than the northwest of the study area. We surveyed the region by systematic aerial recon- naissance using the methods described in Sinclair (1972), Pennycuick (1975), and Maddock (1979). Over the wide valleys and flat plateau regions, we flew parallel transects 5 km apart. In the narrow valleys, we flew along them but ensured that every block on the map was surveyed. After the initial survey of the whole area in February 1976, we excluded the steep, rugged alpine terrain of glaciers and vertical faces not suitable for Caribou and Moose. A Cessna 185 air- craft was used with pilot and navigator in front and two observers in the back. Each observer surveyed his side of the aircraft up to 1 km from the plane. We also counted all animals within a transect of approxi- mately 150 km width that formed an inner sub-sample of the 1 kmwidth. Thel km transect was delimited by a mark on the aircraft struts and the 150 m inner transects had similar marks with strings attached. We calibrated the transects by the methods described in Sinclair (1972) and Norton-Griffiths (1978). The data. Please note that these images are extracted from scanned page images that may have been digitally enhanced fo
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