Search results for "Discoglossus"
showing 9 items of 9 documents
Is the painted frog Discoglossus pictus a declining species in Italy? On the reliability of a distributional atlas approach
2013
The conservation status of amphibians is often assessed using public databases because of a lack of up-to-date field data. However, it is crucial that this kind of data is used carefully, evaluating the reliability and the consistency of the information. In Italy, the conservation status of the painted frog, Discoglossus pictus, was recently assessed using public databases, and the outcome highlighted a worrying situation for the species. We analyzed the reliability of these conclusions and reassessed the status of the painted frog, taking into account its insular distribution and new data of species occurrence. Our results contrast with the previous analysis and show how an incautious use …
Analisi della dieta di Discoglossus pictus (Otth, 1837) in Sicilia (Anura: Alytidae).
2013
Analysis of diet in Discoglossus pictus (Otth, 1837) from Sicily (Anura: Alytidae). The Painted frog (Discoglossus pictus Otth, 1837) (Alytidae) is a monotypic species distributed in North Africa, Sicily and Malta. Many studies have been made in the past about morphological and genetical aspects, but as regards the diet very little can be found in bibliography. This study shows data of a sample of individuals from a breeding site of western Sicily. Samplings were taken from November 2009 to June 2010, during the night. A total of 82 specimens were collected (67 MM and 15 FF). From these we obtained 50 stomachal contents by using the stomach-flushing technique. From stomach contents analysis…
La distribuzione dell'attività proteasica nella blastula e nella giovane gastrula diDiscoglossus pictus
1956
Summary Protease activity has been measured in the animal and vegetal half of the blastula and in the dorsal and ventral regions of the early gastrula of Discoglossus pictus. A higher protease activity was found in the dorsal region of the early gastrula, where presumptive chordamesoderm and presumptive neuroectoderm are localized.
Testing alternative vicariance scenarios in Western Mediterranean discoglossid frogs
2004
Dated molecular phylogenies are often used to interpret evolutionary history with respect to paleogeographic events. Where more than one interpretation is possible, it is desirable but difficult to assess the alternatives in an objective manner. The present work demonstrates a formalized method for testing molecular clock calibrations and biogeographic scenarios based on them. We assessed the plausibility of several previously published biogeographic hypotheses, using the frog genera Alytes, Discoglossus, and Bombina as model groups. Our data set comprised ca. 900bp of partial mitochondrial 16S and 12S rRNA gene sequences (both genes evolved in a clock-like manner across genera) from nearly…
Immune Response ofDiscoglossus Pictus Pictusto a Protein Antigen
1974
Regeneration of the testes in the clawed toad (Discoglossus pictus Otth.) after complete surgical removal
1967
Dopo ablazione totale dei testicoli inDiscoglossus pictus si ha rigenerazione. Nei testicoli rigenerati si riscontrano spermatociti in tutti gli stadi di sviluppo e talvolta anche spermi. E avanzata l'ipotesi che la rigenerazione avvenga a partire da cellule somatiche degli spermidutti.
Caratterizzazione morfometrica di Discoglosso dipinto, Discoglossus pictus Otth 1837, in Sicilia
2010
Molecular markers and species delimitation: examples from the European batrachofauna
1996
AbstractMolecular techniques have revolutionised zoological systematics since the beginning of the seventies. Within the last twenty years numerous new amphibian species have been described in Europe almost solely on the basis of molecular data. This paper focuses on the use of molecular character state and genetic distance data for the delimitation of species. Case studies of European anurans (Discoglossus, water frogs of the genus Rana) are discussed in the framework of concurring species concepts to illustrate problems of assigning species status to divergent populations on the basis of molecular data.