Abstract
Insects include almost 60% of the described eukaryotic animals worldwide. However, the morphological measurements and assessment of the effects of isolation and habitat still lack many insect groups. The current study aimed to compare the morphometric measurements of dissimilar populations of darkling beetles “Pimelia nilotica” in Egypt. A variable comparison of morphometric variations was taken by a threaded micrometer for six different eco-geographical regions from Egypt fall under the Western Mediterranean Coastal Desert, Western Desert Oases, El-Faiyum Depression, the Eastern Desert, Nile Delta, and South Sinai. Twenty-one morphometric measurements were taken in the currents study. Traits best reminiscent of the excellence of populations were distinguished by cluster analysis, and also by the principal component analysis. The primary and second discriminants scores (score 1 and score 2) recorded 76.4% and 23.8%, respectively, of the full variation in samples. Multiple discriminant analysis disclosed clear morphometric differences between Western Desert, Eastern Desert, El-Faiyum Depression, and South Sinai populations. Traits clarifying the maximum of the changeability among populations were those associated with the morphological estimations.
Highlights
The location of Egypt between the faunal areas of the world is fairly unique since it consolidates the qualities of both Palaearctic and Afrotropical districts
Just the Coastal Strip, Gebel Elba, and higher mountains of southern Sinai get relatively a great rainfall, which reflects their composition of flora and fauna
A comparison of P. nilotica populations collected from six different eco-geographical areas based on 17 absolute morphometric characters and 4 ratios indicated significant differences between the six studied populations
Summary
The location of Egypt between the faunal areas of the world is fairly unique since it consolidates the qualities of both Palaearctic and Afrotropical districts. It generally belongs to the Palaearctic; the Afrotropical elements seem to be more frequent than normally suspected (Steyskal and El Bialy, 1967). Just the Coastal Strip, Gebel Elba, and higher mountains of southern Sinai get relatively a great rainfall, which reflects their composition of flora and fauna. Some ecologists divide Egypt into eight ecological regions, in particular: The Coastal Strip, lower Nile Valley and Delta, upper Nile Valley, El-Faiyum Depression, Eastern Desert, Western Desert, Gebel Elba, and Sinai (Larsen, 1991; El Hawagry and Gilbert, 2014). Insects include almost 60% of the described eukaryotic animals worldwide, the morphological measurements and comparison of the effect of isolation and habitat still lack for most insect groups, including the beetles (Coleoptera) (Riad, 2019). Tenebrionidae is one of the largest families of the order Coleoptera, which includes more
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