1,721,065 research outputs found
Environmental genetic variation in two sympatric rodent species (Apodemus flavicollis and A-sylvaticus) in central Italy
No full textThe genetic structure of populations of two sympatric rodent species (Apodemus flavicollis and A. sylvaticus) living in four different biotopes has been investigated by eleetrophoretic analysis of 38 loci. Among the 17 polymorphic loci observed Me-1, Got-1 and Est-3 for A. flavicollis and Got-1, Est-3, Mpi for A. sylvaticus showed a high degree of variation across the biotopes. The values of interpopulation genetic distance and estimated gene flow suggest that natural selection could have an important role in explaining such phenomena
Arvicanthis e Tatera (Rodentia, Murinae) come indicatori per la determinazione di aree filogeografiche di rilevanza conservazionistica nelle savane dell’Africa orientale
No full textA review of mono-and bispecific genera of amphibians worldwide
No full textMonospecific and bispecific genera are of particular interest in studies of taxonomic diversity and speciation evolution. Here, the distribution patterns of mono-and bispecific amphibians worldwide are investigated, with some discussion of on the conservation implications also presented. Based on an online database search (available from the American Museum of Natural History, New York), we found that the mean number of mono-and bispecific genera was similar among zoogeographic regions, with a total of 120 mono-(95 Anura, 17 Caudata, 8 Gymnophiona) and 65 bispecific (48 Anura, 10 Caudata, 7 Gymnophiona) genera. Out of 73 known amphibian families worldwide, only 35.6 % of them do not contain any mono-or bispecific genera. The frequency of mono-or bispecific genera by family was not significantly different among Anura, Caudata and Gymnophiona. There was a general tendency for the number of mono-and bispecific genera of amphibians to be positively correlated with the total number of genera in that family. In Anura, there was a preponderance of mono-specific genera in Afrotropical and Neotropical regions. Concerning bispecific genera, there was a clear preponderance in the Neotropical region for anurans. There was a positive correlation between the number of threatened genera (according to the IUCN Red List) in both the mono-and bispecific groups and the relative number of species in each taxon, thus showing that taxonomical speciosity clearly influences the frequency of occurrence of mono-and bispecific taxa in each family and order. In this regard, Anura dominated in both the number of worldwide described mono-and bispecific taxa as well as in that of the threatened ones according to IUCN Red List
Effetti della perdita e frammentazione degli habitat sui mammiferi (Carnivori, Insettivori e Roditori): implicazioni per la conservazione
No full textPleistocene refugial areas for two species of water shrew, Neomys anomalus and N. fodiens, in the Italian peninsula as revealed by mtDNA analysis.
No full textVariabilità genetica in Microtus savii (Rodentia, Arvicolidae): aspetti cromosomici e molecolari
No full textSpeciazione cromosomica, filogeografia e colonizzazione dell’arcipelago delle Eolie da parte di Mus musculus domesticus e l’ipotesi del “corridoio levantino”.
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