Acclimation and energy metabolism of the dingo, Cards dingo and the coyote, Canis latrans

摘要: Twelve dingos were divided into three groups each containing four animals. One group was warm-acclimated at +30° to +45°C, the second cool-acclimated −20° − 40°C and a third control kept in animal quarters maintained about +23°C. Three coyotes also but they had free access outside runs which used during all seasons. The animals tolerated temperatures of +45°C 25% relative humidity with mean rectal temperature 39.3°C O2 consumption rate 8.2 ml/kg min. Cool-acclimated became distressed ambient between +37.5 +42.5°C 40% this 40.6°C. The one an 16.7 min. The minimum for its thermal neutral range 4.4 min comparable 7.8 min, difference 77% their standard metabolic rates. At −70°C six times recorded range. Despite high energy usage low frostbitten when removed from chamber. The increased rates by factor only 2.2 compared zone. At 69% warm mean. With lower normal values did not suffer any frostbite. The weight fur insulation per unit area some body areas value that corresponding group. When calculated slope vs. relation below critical 64% more than group. The (17.7 min) equal same temperature. This 2.4 zone is proportional increase as shown dingos. However (−10°C) much cold-acclimated (+ 10°C). When other canid studies these results suggest that, even acclimated heat, have tolerance little or no better domestic dog. held moderate expenditure so metabolically economical wolf husky coyote. It concluded dingo species period geographical isolation Australia has changed ability tolerate extremes seasonal acclimatization part accouts acceptance wide environmental temperatures.