1,720,994 research outputs found
Distribution, ecology and conservation of Archaeolacerta bedriagae in Sardinia (Reptilia, Lacertidae)
No full textThis paper is a revision of the distribution of this endemic species in Sardinia, based on both literature and unpublished records, and focused to assess the conservation status of its populations. Two sampling sites were selected for a comparative analysis: in the mountain site, a population density twenty times higher than that found at sea level site was estimated. Underestimation is possible due to the elusivity of this species which usually occurs in rocky habitats where observation is difficult. Some conservation actions were proposed
Reptiles of sardinia: Updating the knowledge on their distribution
No full textSardinia shows a clear lack of herpetological data due to an evident paucity of herpetological surveys. Tis gap of knowledge is worthy of attention, since Sardinia hosts a rich herpetofauna with a large proportion of endemic species, and distribution data are crucial for targeting conservation eforts. In this paper we provide new distribution data for Sardinian reptiles, with the aim of updating our knowledge on their specifc distribution. Data were opportunistically recorded during ten years of feld research in Sardinia, carried out in more than twenty campaigns from April 1999 to June 2009. All the eighteen reptile species belonging to the Sardinian fauna were recorded. A total amount of 293 faunistic data were collected from 178 diferent localities covering the entire study area. Within this dataset, 137 faunistic data fall outside known species' ranges as reported in the Atlas of Italian amphibians and reptiles. In conclusion, data presented here produced a remarkable increase of knowledge on Sardinian reptiles' distribution. Nevertheless, it should be evidenced that, notwithstanding the present updating, the knowledge of Sardinian reptiles' distribution is probably still far from being exhaustive. Tus, further investigations are strongly required for obtaining a complete picture and identifying conservation priorities in terms of isolated species/populations and areas of high diversity and endemicity. © Firenze University Press
La "nazionalità" influenza la morfometria di Archaeolacerta bedriagae?
No full textThe oral communcation deals with some aspects of the geographic variation of the species which occurs in both Sardinia and Corsica and shows some differences in the morphometric character status
Studio degli effetti del fuoco e del taglio di bonifica su popolazioni di due specie sintopiche di Lacertidae (Podarcis sicula e P. muralis)
No full textThe effect of fire and cutting of burnt trees on the lizard populations was studied within a protected area near Rome. The study was focused on the ecological and ethological changes in the local populations of two lizard species (Podarcis sicula and P.muralis) in response to environmental stress and alteration
Nicchia trofica del tritone alpino (Triturus alpestris apuanus Laurenti, 1768)in uno stagno montano delle Alpi Liguri: variazioni stagionali della dieta e differenze tra sessi e stadi vitali.
No full textThe diet of the alpine newt was studied through the stomach flushing method in order to define its ecological role within the pond community
Effetto della variazione altitudinale su Podarcis muralis: termoregolazione e nicchia trofica, pp. 172-175.
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La frammentazione dell’areale di Archaeolacerta bedriagae (Reptilia, Lacertidae): analisi attraverso modelli di idoneità ambientale
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Modelling correlates of microhabitat use of two sympatric lizards: A model selection approach
No full textStudies of the ecological characteristics of sympatric species are important for developing and testing ecological theory, but may be of interest also for conservation biology research when the study species are threatened, endemic and with narrow distribution. Here, we studied a particular aspect of the ecology (i.e. microhabitat use) of two sympatric lizards Archaeolacerta bedriagae, Podareis tiliguerta) endemic to Sardinia and Corsica (Tyrrhenian islands). We studied this issue by modelling procedures, using field data collected at six study areas in both Sardinia and Corsica. We recorded 18 microhabitat variables for each lizard spot. The variables were entered as independent variables in logistic regression analysis with the presence/absence data for the lizards as the dependent variable, and Akaike Information Criterion was applied to select the best models describing the ecological equation of each study species. In total, we based our modelling approach on 296 individuals of A, bedriagae and 182 of P. tiliguerta. The general logistic regression models revealed that five distinct variables were significantly correlated to the presence/absence of A, bedriagae, and six to that of P tiliguerta. We found that three variables were important for only P tiliguerta, two for only A. bedriagae, and three for both species and with an identical sign. We also found some similarities in microhabitat choice between species. Indeed, some variables were always present in the best models of both A. bedriagae and P tiliguerta. In general, A. bedriagae was more related to spots with large stones and low vegetation than P tiliguerta, which, on the contrary, choose spots relatively closer to vegetation. The various reasons explaining the observed similarities and differences between species were examined. It is suggested that our modelling procedure may be widely used for studies of lizard community ecology, because it easy to use and allows a more-in-depth analysis than normal 'count approaches'. © 2009 Koninklijke Brill NV, Leiden
How many Archaeolacerta inhabit the Corso-Sardinian Plate? Allozyme variation and differentiation in Archaeolacerta bedriagae (Camerano, 1885)
No full textArchaeolacerta bedriagae is a rock lizard endemic to Corsica and Sardinia. Four subspecies have been recozied to date on the basis of morphological traits. Previous allozyme investigations revealed high genetic differentiation among populations of the species. Based on these results some authors hypothesized that more than one species of Archaeolacerta may occur on Corsica and Sardinia. In this paper we investigated allozyme variation at 19 gene loci in 5 populations belonging to all subspecies of A. bedriagae in order to study genetic differentiation among populations from Corsica and Sardinia, and to compare our results with those obtained in previous studies carried out on allozyme variation and taxonomy of the species. Low levels of genetic differentiation (average Nei's D = 0.026) and heterogeneity (mean F ST = 0.147) were found comparing the A. bedriagae populations, and there was no evidence of interruption or restriction of gene flow. This is in agreement with the available molecular and morphometric data, while it is not in accordance with allozyme data reported in the previous studies. Our data do not support the hypothesis of an unrecognized criptic species of Archaeolacerta in Corsica and Sardinia, and indicate that the definitive assessment of the taxonomic status of the A. bedriagae populations requires further investigation. © 2009 Koninklijke Brill NV, Leiden
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