ECOLOGY OF LACERTID LIZARDS IN A DESERT AREA OF EASTERN MOROCCO

Some basic aspects of the ecology of five lacertid lizards inhabiting the desert area of Tafilalet, in south-eastern Morocco, are considered: Mesalina guttulata, occupying almost exclusively the hammada habitat, Mesalina olivieri, Acanthodactylus boskianus and Acanthodactylus scutellatus found on sand and bare-ground reg; and Acanthodactylus longipes, inhabiting the sand-dune habitat, the erg. Acanthodactylus scutellatus, A. boskianus, A. longipes and M. olivieri had a bimodal diel activity pattern; in M. guttulata daily activity was centred on the morning hours. All species exhibit fairly precise thermoregulation with a strong relation between body and substratum temperature, particularly for species occupying softer substrata. Mesalina guttulata had a diverse diet during both seasons observed, while in the remaining species termites and ants formed the bulk of the food. The foraging behaviour, diet and ecological characteristics of Lacertidae from the Tafilalet, especially the genus Acanthodactylus, seem to be optimal for the challenging environmental conditions of this desert area. The implications of the foraging strategy of Tafilalet's Acanthodactylus for other species of the genus are discussed.