Review: Egyptian science - how good is it ? Can it be improved ?

No Abstract

Editorial Committee

هيئة التحرير (عربي)Editorial Committee in Arabi

Editorial Committee

هيئة التحري

Polymorphism in the protein of the thoracic muscle of an endemic bee (Anthophora pauperata) in the St Katherine Protectorate

Genetic variability of the solitary bee Anthophora pauperata, endemic to the St Katherine Protectorate, was assessed within and between seven wadis in South Sinai, Egypt. Low levels of variation were found, with most diversity within rather than between sites. There were a total of 34 bands, of which only seven were polymorphic among individuals

A comparative study of two agamid lizards, Laudakia stellio and Pseudotrapelus sinaitus, in southern Sinai

The study compared habitat use and behaviour in two sympatric species of agamid lizard, Laudakia stellio and Pseudotrapelus sinaitus. Despite sharing the same habitat, the two species differed in their utilisation of microhabitats within it. Pseudotrapelus spent significantly longer on rocks compared to Laudakia. Pseudotrapelus showed evidence of heliothermic regulation, spending most of the time in the sun, but moving into the shade in the warmer afternoons. These varying temporal patterns may reflect differential thermoregulatory requirements between the two lizard species. Pseudotrapelus can change colour rapidly. There was no evidence of any thermoregulatory function in this ability; it is likely to be a form of social communication. Being brightly coloured was associated with behaviours implying increased conspicuousness: blue lizards were alert and vigilant for an average of 93% of each viewing session, compared to just 60% of the time in non-blue camouflaged lizards. The striking nature of the transitory blue colouration suggests it may have evolved for maximum salience, a trait common with signals. We simulated social encounters using blue model lizards and mirrors. Behavioural responses to these stimuli all involved colour changes, and support the social-signaling hypothesis

Patterns of resource use by milkweed insects in Sinai

Plant morphology and defensive chemistry are related to the insect community of herbivores on Gomphocarpus sinaicus (Boiss.) (Apocynaceae) in Sinai (Egypt). There appears to be significant variation among individual plants in the components of their chemical defences. The different components of the community respond differently to plant characters; plant defence appears to be an important determinant of the relative abundances of the insect species. The data showed an indications of different relationships of the insect herbivores to levels ofchemical defences, especially aphids. While weevil and bug densities covaried, those of aphids varied more independently, and possibly inversely. The community is compared with the much better known North American herbivore community on plants of the sister-genus Asclepias