. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Bonner zoologische Beiträge 56 263 TTTi i 1111 â -, â â I â â I^T s s s s s 100 90 80 70 60 50 40 30 20 10 O rrnii--,ii,, _ iiilliiiiiiiiiiililiiil. c. 20 1 10- S S S 8 § i i i 100 90 80 70 60 50 40 30 20 10 O i -en d. 15 10 5 â â â 1 m 1 0 s g : s Ã- S S 8 3 S S 8 8 i i i i ! 1 i ^. Ã- 8 8 8 ¿ 100 90 80 70 60 50 40 30 20 10 O Fig. 4. Visibility profiles of Uromastyx aeg\>ptia microlepis at Mahazat as-Sayd at different seasons; a. Spring; b. Early Sum-
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Bonner zoologische Beiträge 56 263 TTTi i 1111 â -, â â I â â I^T s s s s s 100 90 80 70 60 50 40 30 20 10 O rrnii--,ii,, _ iiilliiiiiiiiiiililiiil. c. 20 1 10- S S S 8 § i i i 100 90 80 70 60 50 40 30 20 10 O i -en d. 15 10 5 â â â 1 m 1 0 s g : s Ã- S S 8 3 S S 8 8 i i i i ! 1 i ^. Ã- 8 8 8 ¿ 100 90 80 70 60 50 40 30 20 10 O Fig. 4. Visibility profiles of Uromastyx aeg\>ptia microlepis at Mahazat as-Sayd at different seasons; a. Spring; b. Early Sum- mer; c. Summer; d. Autumn. Results Activitx' structures Fig. 5. Distribution of different behavioral activities as abso- lute numbers (black bars) and as percentage of total observati- ons (grey bars) at different seasons; a. Spring; b. Early Sum- mer; c. Summer; d. Autumn. Behavior: 1. Basking near bun^ow entrance; 2. Animal far away from burrow entrance; 3. Shading under/icac/fl tree; 4. Feeding; 5. Basking on a bush; 6. Basking on a stone. A total of 245 Uromastyx were sighted while driving the transects. The absolute numbers for the respective seasons are: 97 (spring), 82 (early summer), 52 (summer), 14 (au- tumn). This is equivalent to % (spring), % (early summer), % (summer) and % (autumn) of total observed presence above ground. There is a very restricted activity during winter (deduced from own data on body temperatures, data not shown; Bouskila 1986, Al-Hazmi et al. 2005). These observations show that Uro- mastyx a. microlepis is highly seasonal at Mahazat as-Sayd (X2 = , P < , df = 3), with a maximum visibili- ty from spring to early summer. Profiles of daily visibility were produced for every sea- son by adding up the specimens observed within respec- tive intervals of 30 minutes (Fig. 4). The diagrams show, that U. a. microlepis exhibits a bimodal rhythm in spring and early summer with two relatively high visibil
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