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sur le développement des zones arides et semi-arides

Titre : Ecological Factors affecting Biodiversity, Activity and Parasitic infection of some lizards inhabiting different egyptian habitats

Auteur : Lithy, Usama Khamis.

Etablissement de soutenance : Beni-Suef University

Grade : Master of Science (MS) in Zoology 2008

Résumé
The present study was carried out to determine the effect of climatic factors on the biodiversity, activity and parasitic infection of some burrowing t reptiles (Genus Acanthodactylus) inhabiting at the different territories of the Egyptian desert, where reptile species diversity in arid lands is influenced by a variety of abiotic (Air, soil temperature at different depths and soil moisture) and anthropogenic factors (food and water availability). The present study aimed also to determine the effect of human impacts on biodiversity, I distribution and activity of these reptiles. A total of 875 living reptiles belonging to family Lacertidae order Squamata were recorded from 5-different territories in the Egyptian deserts ; ^feu-Rawash and El-Saliba (El-Giza province), Wadi El-Natroun (El-Behira ■province), Balteem and Borg El-Borolos (Kafr El-Sheikh province). The different climatic factors of the studied territories were recorded to scrutinize the microhabitats of Acanthodactylus sp. in order to inspect the [relationship between the ecological factors and the parasitic abundance, distribution and percentage of infection with Haemogregarines. The research was divided into : P Effect of climatic factors on the collected lizards : The Acanthodactylus lizards were divided into three species ; vthodactylus boskianus, Acanthodactylus scutellatus and Acanthodactylus rdalis. The highest number (313) recorded in Borg El-Borolos territory and lowest one was (90) in Wadi El-Natroun regions, while the highest « imber (237) was during spring and the lowest (185) was during autumn. [ During the collection of lizards from their microhabitats (surface, hcrrow^ and under shrubs), the highest average number (15±0.4) during spring from under shrubs and the lowest (1.3±0.4) during winter. The highest ■ arerage from their burrows was 13±0.4 recorded during winter and the lowest Iwas (0) recorded during summer, while the highest average number of Summary and Conclusion tected lizards from the surface was (8.7±0.2) recorded during spring and lowest one was (0) recorded during summer. \ The seasonal variations of the microhabitats of the studied lizards aerred to the fluctuation in the differences among the collected numbers of nrds from the three microhabitats (surface, burrows and under shrubs) at r different territories. There are highly significant correlations between soil moisture and the ■ numbers of collected lizards from the surface and under shrubs .678 & 0.689). Air temperatures were reported a negatively correlation ■lie average of collected lizards from the surface (r =-0.460). Soil surface lure, 10, 20 & 40cm were recorded a negatively correlation with the :e of collected ones from the burrows (r —0.473, -0.465, -0.535 & M5), respectively. Regional and seasonal variation between the collected lizards : • Air temperature : •

Présentation étendue (EULC)