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Morphometric and karyological differentiation among populations of Discoglossus pictus (Discoglossidae: Anura) in Eastern North Africa

100%

Nabil A., Sarra F., Slim B.-Y., Khaled S.

Annales Zoologici

2010

tom 60

nr 1

To assess karyological and morphometric diversity within Discoglossus pictus Otth 1837, morphometric and cytogenetic analyses were carried out on five populations from the northern Tunisia and Algeria. A total of eight morphometric adult traits were evaluated, tadpole oral disc structure was described and chromosome patterns were assessed by means of conventional staining and banding methods (C-, Ag-NOR and CMA₃ banding). Karyological data indicated the same chromosome and chromatin characters among the five populations. We observed also the same oral disk structure (LTRF: ⅔) in all studied Discoglossus tadpoles. However, we found significant differences in morphometric parameters of the specimens from these localities. Discriminant Function Analysis (DFA) of morphometric variables correctly classified 88% of individuals to their original localities. The pattern of morphometric variation does not match the genetic observation, which suggests that body shape differences result from the phenotypic plasticity correlated with local climatic factors.

Assessment of intraspecific mtDNA variability of the water frog Pelophylax saharicus in Eastern North Africa

88%

Nabil A., Sarra F., Paolo M., Slim B.-Y., Khaled S.

Annales Zoologici

2010

tom 60

nr 4

The water frog Pelophylax saharicus is the most widespread anuran in North Africa and thus subjected to widely differing environmental conditions in different parts of its distribution range. In this paper we examined genetic structure of species 15 populations across Tunisia and eastern Algeria. We evaluated a potential role of mountain ranges as significant barriers to gene flow, using a partial sequences of the mitochondrial cytochrome oxidase I gene (COI). Twenty haplotypes were recorded in a total sample of 38 individuals, whereas, an overall low genetic variation of 0.4% was observed. AMOVA revealed no significant genetic structuring related to the 4 groups across the studied area. Unimodal mismatch distributions and significantly negative values of Fu's Fs and Tajima's D statistics support a recent expansion of populations from a smaller founder population as the most plausible explanation of the observed significant deviations from neutrality in the North-East African green frog populations.

Ograniczanie wyników

2 Annales Zoologici

2 Khaled S.

2 Nabil A.

2 Sarra F.

2 Slim B.-Y.

1 Paolo M.

2 2010

Wyniki wyszukiwania

Morphometric and karyological differentiation among populations of Discoglossus pictus (Discoglossidae: Anura) in Eastern North Africa

Assessment of intraspecific mtDNA variability of the water frog Pelophylax saharicus in Eastern North Africa