Articolele autorului Istvan Sas
Link la profilul stiintific al lui Istvan Sas

Distribution and Status of the Moor Frog (Rana arvalis) in Romania

In Romania, Rana arvalis is distributed in four large geographical regions: the Western Plains, the Transylvanian Plateau, the Eastern Carpathians (all of these are in Transylvania) and the northern areas of Romanian Moldavia. However, the species has also been recorded in the, Tisa River Basin north of Maramures. From current knowledge, R. arvalis populations in Romania occupy very differing, however always humid habitats, all of which are surrounded

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Amfibienii apelor termale din vestul Romaniei

The Amphibians from the Western Romanian Thermal Waters In Romanian with English summary. Book covered by Thomson ISI in BIOSIS Previews and in BIOSIS Procedings and Meetings "In north-western Romania there is a special category of amphibian-populating habitats represented by thermal waters. In the region there is a series of natural thermal springs, situated in the contact area between the Pannonic Plain and the neighboring hill and mountain units

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The reproductive dynamics of temperate amphibians: a review

The annual life cycle of pond breeding amphibians is characterized by periodical migrations between three critical habitats: breeding, post breeding - feeding - and hibernating. The breeding season starts with the migration of the reproductive adults toward the breeding site and is characterized by intense manifestations in behavior and development of secondary sexual characters. Time spent in the water is strongly influenced by the outcome of success

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Overwintering without winter: the exceptional case of two terrestrial anurans from the thermal habitats in Romania

In the winter period of December 2006 – February 2007, in the thermal waters from north-western Romania we encountered two terrestrial amphibian species which did not display the hibernation phenomenon: Bufo bufo and Rana temporaria. We hypothesize that the specimens of the two species were dispersing individuals that, being outside their home ranges, were trapped in the thermal ponds in late autumn.

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Revista de zoologie, „North-Western Journal of Zoology”, editata in Romania, a fost cotata ISI

Revista de zoologie, "North-Western Journal of Zoology", editata in Romania, a fost cotata ISI. Incepand cu numerele din anul 2007, NW J Zoology apare pe "Web of Science - Science Citation index". Factorul de impact al revistei va fi disponibil in cel mult doi ani. http://herp-or.uv.ro/nwjz

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Food habits of a Pelophylax lessonae – Pelophylax kl. esculentus population from North-Western Romania

In the April-July period of the year 2004, we had analysed the trophic spectrum of a total number of 114 green frogs (74 Pelophylax kl. esculentus, 40 Pelophylax lessonae) from a habitat near Livada localityin the north-western part of Romania. We extracted a total number of 693 prey items (386 from Pelophylax kl. esculentus and 307 from Pelophylax lessone). Beside invertebrate preys, plant materials and remainings of molted skin were identified

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Seasonal variation in the the diet of a Hyla arborea population from Romania.

We examined the diet of Hyla arborea over its entire activity period (March to late September, 2004), and analysed a total of 585 adult samples. From the stomach contents we identified plant remains, shed-skin fragments, and animals. We identified a total of 2976 prey items, almost all of which originated from the terrestrial environment. Adult araneans and coleopterans were the most abundant prey items in the diet of the studied tree frogs. Some

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Food habits of Rana lessonae and Rana arvalis in Covasna County (Romania)

The objective of our study was to bring data upon the feeding of Rana lessonae, Rana arvalis from Reci region, Covasna County. We watched at the trophic spectrum of this two Rana species the variation depending on species, sex, habitat and diurnal activity. The feeding of moor frogs is more intense in twilight period. The largest diversity of preys was presented in the stomach contents of Rana lessonae samples captured from the pool. The females

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Phylogeography of two European newt species-discordance between mtDNA and morphology

The newts Triturus vulgaris and Triturus montandoni are sister species that exhibit contrasting levels of intraspecific morphological variation. Triturus vulgaris has a broad Eurasiatic distribution encompassing both formerly glaciated and unglaciated areas and shows substantial morphological differentiation in the southern part of its range, while T. montandoni , confined to the Carpathians, is morphologically uniform. We analysed sequence variation

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