By M.J. Berridge, J.E. Treherne, V.B. Wigglesworth (Eds.)
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Extra resources for Advances in Insect Physiology, Vol. 16
An alternative water source permitting continuous active life in deserts is shown by another representative of the orthopteroid orders, the desert cockroach Arenivugu. This insect can absorb water vapour from air above 82% RH, (Edney, 1966; O’Donnell 1978) and Edney el al. (1974) have shown that these conditions can be found only 45 cm below the surface in the habitat where it makes its sand burrows, even in summer. The vertical distribution of this roach showed a good correlation with its preferred temperature and R H range; and even if it does get caught on the surface and subjected to stress it shows very high tolerance of osmotic change and good regulatory responses (Edney, 1968).
Tbis maintained continuously when using high-reward flowers, but is allowed to drop when walking between clumped small florets with limited nectar, underlining the high costs of thermoregulation and the necessity for the insect to work out the economics of foraging “correctly”. There are still some inconclusive aspects of the bumble-bee story; some controversy remains over the role of colour in terms of thermal regulation for the genus (see Stiles, 1979; Plowright and Owen, 1980), but it is probable that for such large insects colour can be of only limited importance.
C. ) pp. 15-77. Academic Press, New York Cloudsley-Thompson, J. L. (1975). Adaptations of Arthropoda to arid environments. Ann. Rev. Ent. 20,261-283 Coenen-Stass, D. (1976). Vorzugstemperatur und Vorzugsluftfeuchtigkeit der beiden Schabenarten Periplaneta americana und Blaberus trapezoideus. Ent. exp. Appl. 143-1 53 M I C R 0 C L I M A T E S A N D EN V I R 0 N M E N T A L P H Y S I 0 L O G Y 47 Corbet, P. S. (1966). T. Can. Entomol. 98, 1238-1252 Corbet, P. S. (1972). The microclimate of arctic plants and animals, on land and in fresh water.