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First published online September 9, 2003

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Discontinuous gas exchange and the significance of respiratory water loss in scarabaeine beetles

Steven L. Chown^1,* and Adrian L. V. Davis²

¹ Spatial Physiological and Conservation Ecology Group, Department of Zoology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
² Department of Zoology and Entomology, University of Pretoria, Pretoria 0002, South Africa

View larger version (11K): [in a new window]   Fig. 1. (A) Water loss rate (mg h-1) adjusted for body mass, and (B) proportional contribution of spiracular to total water loss (%), adjusted for body mass, at 20°C in the five Scarabaeus species investigated in this study. Variation in rate of water loss is in the direction expected from the mean annual rainfall of the area from which the species was collected. Values are means ± S.E.M. Gari, S. gariepinus; Stri, S. striatus; Gale, S. galenus; Rust, S. rusticus; West, S. westwoodi.