Abstract

The sand goanna, Varanus griseus is an ubiquitous terrestrial species which is found throughout the Saharan-Indian desert, especially in sandy wet areas like erg and wadi. The study was confined to two localities in the north-western Saharan desert: the Saoura wadi and the Guir hamada. There were marked differences in the diurnal activity pattern of Varanus griseus, not only in these two areas, but also in the same area. This activity was conditioned more by availability of prey than by climate factors. Water influx and efflux ranged respectively from 0·26 to 3·61 ml (100 g)−1 (d)−1 and 0·86 to 4·54 ml (100 g)−1 (d)−1. Water turnover of individuals in balance was 2·83 ml. (100 g)−1(d)−1. Production of metabolic water was estimated to about 0·30 ml (100 g)−1 (d)−1 at 31°C. A significant correlation was established between activity, diet and water flux.

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