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This paper presents a case study of the chromosomal complement of 16 mice Mus , musculus domesticus Linnaeus, r 1758 from the region near one of the most recent disastrous earthquakes in Italy (named Umbria-Marche 1997), with the aim of ex­amining chromosomal variability among the mice from the seismically active zones. For the present investigation, the sampling sites were chosen in the vicinity of some active faults, supposedly the main earthquake generators in the area. In the three localities, that lie approximately on the fault lines, mice with a reduced chromosomal number (2n = 36 to 39) were trapped. This reduction is due to the presence of three different Robertsonian metacentrics - Rb(9.14), Rb(10.12) and Rb(15.17) - in both the homo­zygous and heterozygous states. Mice trapped in four localities more distant from the fault zone only had the standard karyotype (2n = 40). These results increase the need to analyze in more detail the distribution of karyotypes in relation with active faults.
A number of geographically defined Robertsonian (Kb) populations of the wild house mouse Mus musculus domesticus Schwarz and Schwarz, 1943 occurs in several areas of Europe {including Greece) and northern Africa. A multivariate analysis of 26 morphometric characters studied in 6 populations from Greece was performed to detect possible morphological variability in populations having different chromosome number. A morphological polymorphism among alt the studied populations was found but this is attributed rather to geographical than to karyotypic relations.
The parasite fauna (protozoa, helminths and insects) of the two most widespread Murinae rodents in El Hierro (Canary Islands, Spain), the black rat (Rattus rattus) and the house mouse (Mus musculus domesticus) was studied. Faunistic, ecological, ecotoxicological data, as well as information on the biology of some nematode parasites of R. rattus are provided. The present work is unprecedented in the Canary Islands, and provides the first data on the parasite biodiversity in Murinae from the archipelago. Concerning to parasitofaunas stands out: a) impoverishment of biodiversity of helminths respect of which have the same hosts in other islands; b) increasing the number of species of Siphonaptera, even compared with flea species that parasitize the same hosts from continental biotopes.
Three morphological characters were used to depict the position of the hybrid zone between two species of house mice, M. musculus Linnaeus, 1758 and M. domesticus Schwarz et Schwarz, 1943, across a vast area covering countries of the former Yugo­slavia, Albania, Bulgaria and Greece. Quantitative approach based on a morphological index (MI), resembling the hybrid index widely used in allozyme-based genetic studies, was used. The zone crosses Slovenia south of the Sava River, and then follows the Dinaric Mts to Montenegro and northern Albania. Contrary to many previously published results, the zone was found to run parallel with northern borders of Albania and the former Yugoslavian Macedonia, about 150 km north of the Greek border, thus giving its course rather "shallow" appearance at this part of the Balkan Peninsula.
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