In the axial zone of the Umbria-Marche Apennines, several fault-bounded intermontane basins (i.e., Colfiorito, Norcia, Castelluccio, and Leonessa) were generated at the end of Lower Pleistocene. The analysis of the master fault of the basins, the relicts of planation surfaces and the drainage network arrangements, allowed us the improvement of knowledge on the Pleistocene morphotectonic evolution of those basins.\ud
Morphometry and geostatistics of the topography have been performed to obtain indexes suitable for assessing the role of faults displacements on the landscape development. Furthermore, a gravimetric analysis realized along some basins has furnished new data on their sedimentary infill. The basins are filled by Pleistocene to Holocene fluvial-lacustrine coarse-grained deposits, and the bedrock consists of Jurassic to Miocene\ud
limestone and marls belonging to the Umbria-Marche succession. Several historical and instrumental highly destructive earthquakes occurred in this area: January 14, 1703 (X MCS, M = 6.6); September 19, 1979 (Ms = 5.9, focal depth of 6–8 km); September 26, 1997 (Mw = 6.0, focal depth of 6–8 km). Faults and earthquake focal mechanisms are compatible with a predominant NE–SW extension, but strike-slip and reverse mechanisms have been also documented. The fault activity appears to have had a predominant role in controlling the sedimentation processes inside the intermontane basins, as well as in controlling their Pliocene to Quaternary evolution
The study shows a significant net precipitation and surficial runoff decrease in the Province of Pesaro-Urbino during the 1950-2010 period, especially affecting mountain areas and the water-surplus winter season. Runoff variation is also related to a significant land use change, due to a progressive natural reafforestation process that has taken place in the mountain area. Candigliano river’s base-flow, fed by carbonate aquifers’ groundwater discharge, was found more stable over time, due to an aquifers’ capacity largely exceeding that of existing surface reservoirs. The latter have been affected by a significant silting process, which is still active, as suggested by specific erosion rates of watersheds, particularly in the Foglia basin. Important implications both on sediment mobility, surface water-supply reliability, minimum flow constraints and effectiveness of volume-recovery projects of reservoirs were preliminarly evaluated. In the perspective of a necessary adaptation process to the climate change, the study suggests a gradual transition from the present prevailing use of surface water, to an integrated management of the carbonate aquifers’ dynamic resources, on a seasonal base, as a sustainable strategy for the next future.
The Valdes Peninsula is a high-value natural area located on the Atlantic coast of the Argentine Patagonia. This research sought to survey raptor species of the peninsula, which has been little investigated. Roadside raptor surveys were carried out along a 451-km roadside transect in November 2012 and in April 2013. Ninety-five diurnal raptors were observed (43 in 2012 and 52 in 2013) comprising a total of 9 species. The most detected species were Cathartes aura and Milvago chimango. The abundances recorded in our study were lower than those obtained in other similar studies in continental Patagonia.
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