Lucentini L.,University of Perugia |
Puletti M.E.,University of Perugia |
Ricciolini C.,University of Perugia |
Gigliarelli L.,University of Perugia |
And 5 more authors.
PLoS ONE | Year: 2011
We address the taxonomic position of the southern European individuals of pike, performing a series of tests and comparisons from morphology, DNA taxonomy and population genetics parameters, in order to support the hypothesis that two species of pike, and not only one, exist in Europe. A strong relationship emerged between a northern genotype supported by COI, Cytb, AFLP and specific fragments, and a phenotype with round spot skin colour pattern and a large number of scales in the lateral line, clearly separated from a southern genotype with other skin colour pattern and a low number of scales in the lateral line. DNA taxonomy, based on a coalescent approach (GMYC) from phylogenetic reconstructions on COI and Cytb together with AFLP admixture analysis, supported the existence of two independently evolving entities. Such differences are not simply due to geographic distances, as northern European samples are more similar to Canadian and Chinese samples than the southern Europe ones. Thus, given that the differences between the two groups of European pike are significant at the phenotypic, genotypic and geographical levels, we propose the identification of two pike species: the already known northern pike (Esox lucius) and the southern pike (E. flaviae n.sp.). The correct identification of these two lineages as independent species should give rise to a ban on the introduction of northern pikes in southern Europe for recreational fishing, due to potential problems of hybridisation. © 2011 Lucentini et al.
Breccolotti M.,University of Perugia |
Beffa C.A.,Studio Beffa and Associates |
Rapicetta A.,Provincia di Perugia |
Pelliccia F.,Provincia di Perugia
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2013
This paper describes the analyses carried out to evaluate and improve the load-bearing capacity of an old riveted steel bridge located in the Province of Perugia, in the central part of Italy. The bridge was designed and constructed between 1914 and 1918 to carry pedestrian and light vehicle loads, well below the current transportation requirements. It is composed of two steel spans with three continuous truss beams and of three masonry arches with an overall length of 116 m. The metallic part of the bridge rests on two unreinforced concrete abutments and on a pier, also made of unreinforced concrete, built inside the Tiber riverbed. A detailed study of the assemblage of the riveted steel elements put in evidence instability problems that had caused a partial buckling in a lower chord close to the inner support. Furthermore, the actual support system, composed of fixed bearings on the central pier and longitudinal sliding bearings on the abutments, concentrates the longitudinal seismic forces on the central pier which is unable to carry relevant horizontal loads. In this paper, the works carried out to increase the admissible traffic load and those to improve the behaviour of the bridge under seismic actions are briefly described.
The riparian Passerines of lake Trasimeno (Umbria, Central Italy): A 11-years study by constant-effort mist-netting [I Passeriformi dell'ambiente ripariale del lago Trasimeno: Risultati di Undici anni di inanellamento a sforzo costante]
Muzzatti M.,Oasi Naturalistica La Valle |
Chiappini M.M.,Oasi Naturalistica La Valle |
Velatta F.,Provincia di Perugia |
Bonomi M.,Oasi Naturalistica La Valle
Avocetta | Year: 2010
From August 1996 to December 2007 at a reedbed site of lake Trasimeno we carried out 562 mist-netting sessions (at least once every ten days). Through the years we kept constantly the same numbers and positions of mist-nets. Mist-netting always started at dawn and stopped at midday, without using any recorded calling. We trapped 13512 birds belonging to 52 species. The collected data allowed us to investigate: the composition and the ecological parameters of the passerine community and their seasonal variations; trends of the most abundant species, calculated taking into account either the whole annual sample or only the breeding population (adult age-class during the breeding season). We found 12 species being dominant at least in one month: Prunella modularis, Cettia cetti, Acrocephalus melanopogon, A. schoenobaenus, A. scirpaceus, A. arundinaceus, Phylloscopus collybita, Sylvia atricapilla, Erithacus rubecula, Cyanistes caeruleus, Remiz pendulinus, Emberiza schoeniclus. The community parameters showed strong seasonal variations: abundance, biomass values and percentage of marshland species were highest from late spring to early autumn, while in the same period diversity and equitability reached their minimum. Considering for each species the complete annual sample, only three species out of 18 showed significant trends: Panurus biarmicus (decrease), Erithacus rubecula (increase), Emberiza schoeniclus (increase). Taking into account the breeding species, we found out significant negative trends for Panurus biarmicus, Cettia cetti, Remiz pendulinus; the remaining species (Acrocephalus scirpaceus, A. arundinaceus, Sylvia atricapilla, Parus major, Passer italiae) showed negative but not significant variations. The decrease of some marshland species might depend (at least in part) on the reedbed loss and degradation. © 2010 CISO - Centro Italiano Studi Ornitologici.
Aisa E.,Provincia di Perugia |
De Maria A.,Provincia di Perugia |
De Sortis A.,Presidenza Del Consiglio Dei Ministri |
Nasini U.,Provincia di Perugia
Ingegneria Sismica | Year: 2011
The paper addresses the analysis of the seismic damage of Onna, a village near L'Aquila almost completely destructed during the 6 April event. A purposely developed data form has been used to collect the observations of several surveyors. The analysis of the construction typologies, of the seismic vulnerability and of the damage lead to the conclusion that the poor characteristics of the masonry played a dramatic role in the seismic damage suffered by the buildings, despite that some typical historical seismic provisions were present (limited height of the buildings, wood ties). The low level of damage of some unreinforced masonry buildings in Onna, built following a good construction practice, indirectly confirms the heavy role played by the seismic vulnerability in the damage observed.