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La diversità nei roditori africani del genere Tatera: un approccio di morfometria geometrica
No full textMus musculus domesticus: evoluzione cromosomica, filogeografia e morfometria geometrica delle popolazioni dell’arcipelago delle isole Eolie (Sicilia, Italia).
No full textA new chromosomal race of the house mouse - Mus musculus domesticus - in the Vulcano Island - Aeolian Archipelagos, Italy.
No full textSpeciazione cromosomica, filogeografia e colonizzazione dell’arcipelago delle Eolie da parte di Mus musculus domesticus e l’ipotesi del “corridoio levantino”.
No full textChromosomal speciation, phylogeography and colonization of aeolian islands by Mus musculus domesticus.
No full textThe phylogeography of Crocidura suaveolens from southern Italy reveals the absence of an endemic lineage and supports a Trans-Adriatic connection with the Balkanic refugium
No full textA molecular phylogeographic study using a fragment of the mitochondrial gene for cytochrome b (cytb) was performed on the lesser white-toothed shrew, Crocidura suaveolens, from seven localities in central and southern Italy. Comparison with cytb European haplotypes revealed the absence of endemic lineages in the region, in contrast to what has been observed for many other Italian terrestrial vertebrates. Indeed all the Italian specimens results nested with Balkanic conspecific within an Italo-Balkan clade. Historical demography of this clade showed a scenario of expansion which preceded the LGM. This evidence of glacial persistence indicates a certain flexibility of the classic models of Pleistocene biogeography
Multiple origins of the western European house mouse in the Aeolian Archipelago: clues from mtDNA and chromosomes
No full textThe expansion of Mus musculus domesticus from its origin has been studied in detail. The colonization routes and times depended on its commensal habits which favoured a rapid and recent dispersal, making it difficult to unravel the expansion pattern. The situation is still obscure in the central Mediterranean area. Mitochondrial D-loop was sequenced for 65 mice from the Aeolian Archipelago and the sixteen haplotypes identified were compared with the 528 available mouse haplotypes. The central Mediterranean phylogeography, the demographic history of the Aeolian mice and the relationships between mtDNA and karyotypes was investigate. Five lineages are present, belonging to five of the haplogroups previously described for the Mediterranean basin, and most individuals fall within the European haplogroups. The Archipelago was subjected to multiple colonizations and chromosomal and molecular data agree in indicating Sicily and Italy as possible sources of colonization in recent times. Nevertheless, the signatures of earlier colonizations might have been lost through extinction and admixing of mice due to human movements. Drastic events during the entire colonization process have led to the present-day random distribution of haplotypes. Furthermore, Salina emerges as an ancestral condition and no relation between karyotype composition and haplotype variability was highlighted
Pattern of shape variation in the eastern African gerbils of the genus Gerbilliscus (Rodentia, Muridae): Environmental correlations and implication for taxonomy and systematics
No full textGerbilliscus has been in recent years the subject of new molecular and karyological investigations that shed new light on the evolutionary processes of this taxon. However, the patterns of phenotypic diversification of Gerbilliscus remain poorly understood. Furthermore, the molecular phylogenetic analyses posed new questions concerning the systematics and taxonomy of the whole genus and revealed the possible occurrence of cryptic species and hence the need to carry out a taxonomic revision. We used geometric morphometrics to investigate the adaptive value of morphological changes and to elucidate the systematic relationships and taxonomic status of the Gerbilliscus species of east Africa. Our results show concordance between morphological and genetic species boundaries. However, the observed morphological differences appear not only related to hereditary characters. In fact, the correlation with the climatic variables suggests an adaptive value of shape changes related to different trophic resources availability. Finally, discriminant analysis of the eastern Africa Gerbilliscus species highlight the distinctiveness of G. vicinus, clearly separated from G. robustus and G. nigricaudus. (C) 2009 Deutsche Gesellschaft fur Saugetierkunde. Published by Elsevier GmbH. All rights reserved
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