54 research outputs found
Il centro antico di Pozzuoli: un esempio di interazione fra eventi geologici, articolazione del sottosuolo e storia degli insediamenti.
No full textIn this paper some scientific issues, analysed after the 1982.1984 bradyseismic crisis at Phlegrean
Fields, have been reviewed and re-examined.
After the analysis of the peculiar features of tlze area in terms of interaction between urban settlements
history and geo2ogical phenomena (bradyseismic aizd volcanic activiiy), the structural and
stratigraphic setting of the portion of Pozzuoli urban area, located around the Rione Terra and the
Anfiteatro Flavio, is described.
Drill-lzole data analysis, performed using a Geographical Ilzformation System, and tlze results of
geophysical investigations and laboratory and field geotechnical tests, allowed to recognize three main lithologic units: tuff bedrock; a sequence of marine and continental pyroclastic deposits; made-land and
filling malerial. The characters and the geometry of these units are described, with particular emphasis
on fills, which are vey interesting from the geoarcheological and geothecnical points of view. ,i
On the basis of: - the depth of the top of the tuff from the ground surface; - the thickness of
the fills; - the depth of the piezometric level; a partition of the area into three zone, important from
the point of view of the ground elfects related to the bradyseism, is proposed. The comparison with
the buildings damages distribution suggests interesting insights, in particular regarding to the coastal
belt and the Rione Terra-Anfiteatro Flavio sector
The impact of agro-pastoral abandonment on the Rock Partridge Alectoris graeca in the Apennines
No full textHuman depopulation of rural mountain areas and the consequent abandonment of tradi- tional land management are among the greatest driving forces behind changes in moun- tain ecosystems in Western Europe. Tree and shrub encroachment lead to an increase in landscape matrix uniformity and habitat fragmentation. For some animal species, this represents an unusual case of habitat loss caused by secondary succession. The animal species associated with this agro-pastoral habitat may suffer from decreased connectivity as a consequence. The Rock Partridge Alectoris graeca is a species endemic to European mountains that represents a model for investigating the impact of habitat loss. We com- pared the habitat suitability of the Apennine Rock Partridge prior to abandonment of traditional agro-pastoral activities by aerial photography with the current landscape, in order to investigate the effect of secondary succession on the distribution and viability of the species. We assessed the historical distribution (c. 1900–1950) by quantifying anec- dotal evidence from interviews, and the current distribution (2005) from survey data. We applied ecological niche factor analysis and connectivity approaches to evaluate change in habitat suitability over this time scale. Moreover, to quantify landscape connec- tivity, we evaluated the relative importance of each patch in the two periods. Results indicated that to maintain a viable population in the Apennines, the species requires an ensemble of ecological conditions considerably different from the current situation. We observed a drastic decrease in connectivity as a result of a reduction in numbers and size of high suitability patches. This is most probably the primary cause of the current decline of the Rock Partridge population in the Apennine
Molecular characterization of 18S rDNA partial sequence in Microcosmus (Stolidobranchiata, Pyuridae)
No full textWe present a 18S rDNA based molecular phylogeny of two species of the genus Microcosmus (M. sulcatus and M. claudicans) sampled in the Mediterranean, to investigate their phylogenetic position relative to species of the order Stolidobranchiata. The analysis is based on partial sequences (739 bp) of the 18S rDNA. Among the 18 variable sites found between the two species, 4 correspond to transi- tions (ts), 14 to transversions (tv) and 4 to deletions/insertions. In the considered Stolidobranchiata, we found 4.3% overall mean number of nucleotide differences and 0.06 (S.E. ±0.01) Kimura 2-parameter distance. The mean number of nucleotide differences between Microcosmus spp. and other Stolido- branchiata species was of 6% and 0.08 (S.E. ±0.01) Kimura 2-parameter distance. A molecular phyl- ogeny obtained by Maximum Parsimony corroborates results of the traditional taxonomy
Demographic dynamics of wild boar (Sus scrofa) populations in a National Park to management purpose
No full text
Passeri in crisi? Da "pest" a "species of conservation concern": biologia, problematiche e conservazione dei passeri
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