Abstract
The heat transfer through Svalbard reindeer (Rangifer tarandus platyrhynchus) fur samples was studied with respect to wind velocity, season and animal age. A total of 33 dorsal fur sections were investigated using a wind tunnel. Insulation varied with season (calving, summer, autumn and winter). At zero wind velocity, fur insulation was significantly different between seasons for both calf and adult fur samples. At the same time, there was no significant difference between calf and adult insulation for the summer, autumn and winter seasons. Calf fur insulated as well as adult fur. Winter insulation of Svalbard reindeer was approximately 3 times that of summer. Increasing wind veloci¬ty increased heat loss, however, the increase was not dramatic. When wind coefficients (slope) of the heat transfer regression lines were compared, between season and between calf and adult, no significant differences were reported. All fur samples showed similar increases in heat transfer for wind velocities between 0 and 10 m.s-1. The conductance of winter fur of Svalbard reindeer was almost half that of caribou fur. Also, conductance was not as greatly influenced by wind as caribou fur
Highlights
Forced convection by wind is a major parameter affecting fur heat loss, and a major avenue of heat transfer for homeotherms
When calm air conductance was com¬ pared between adults and calves within seasons, no significant difference was observed regardless of the season
Increasing wind velocity does effect heat transfer through the fur samples tested, since typically the regression lines presented in Figs. 1 and 2 have slopes significantly different from zero (Table 3)
Summary
Forced convection by wind is a major parameter affecting fur heat loss, and a major avenue of heat transfer for homeotherms. Abstract: The heat transfer through Svalbard reindeer (Rangifer tarandus platyrhynchus) fur samples was studied with respect to wind velocity, season and animal age. A t zero wind velocity, fur insulation was significantly different between seasons for both calf and adult fur samples.
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