Status of the Crested newts (Triturus cristatus, T. carnifex) in Salzburg and neighbouring regions: Distribution and Conservation

0374789 - ÚBO 2012 DE eng A - Abstrakt
Maletzky, A. - Goldschmid, A. - Gruber, H.-J. - Kyek, M. - Mikulíček, Peter
Status of the Crested newts (Triturus cristatus, T. carnifex) in Salzburg and neighbouring regions: Distribution and Conservation.
13th Ordinary General Meeting of the Societas Europaea Herpetologica (SEH). Německo: Deutsche Forschungsgemeinschaft, 2005. s. 44.
[Ordinary General Meeting of the Societas Europaea Herpetologica /13./. 27.09.2005-02.10.2005, Bonn]
Výzkumný záměr: CEZ:AV0Z60930519
Klíčová slova: Amphibia * Austria * genetic variation * habitat requirements * Triturus cristatus superspecies
Kód oboru RIV: EG - Zoologie
http://www.seh-herpetology.org/files/SEH_Abstracts_Final_20-09.pdf

Central European amphibians are strongly affected by intensive anthropogenic pressure, especially in lowland areas. Destruction and fragmentation of habitats lead to isolation of populations, culminating in a continuous decline of population numbers. Increasing and often insurmountable distances in-between populations finally result in low genetic diversity. Crested newts (Triturus cristatus superspecies) are particularly threatened by these developments, because they require diverse aquatic and terrestrial habitats. In the Province of Salzburg (Austria), and neighbouring areas in Bavaria, two Crested newt species (Triturus cristatus, T. carnifex) are distributed and some records of hybrid populations are documented, basing on morphological and biometrical data. During the year 2004 and 2005 these populations were surveyed. Historical and current distribution data were collected and compared, showing a large decline from 69 locations recorded between 1924 and 2003 to only 15 in 2005. For each remaining population the quality of aquatic and terrestrial habitats was assessed and population sizes were estimated by mark recapture censuses. Furthermore, potential areas of distribution and dispersion, as well as migration corridors and barriers were delineated. Additionally 35 populations originating from south-eastern Bavaria (Germany), Salzburg, Upper Austria and Styria were used for genetic analysis. Genetic variation based on 7 polymorphic microsatellite loci was examined. In all Austrian populations tissue was sampled non-invasively by means of buccal swabs which proved as useful as toe-clips obtained from Bavarian populations. Analysis of mitochondrial DNA together with biometrical data were used to locate the specific distribution of the two parapatric species T. cristatus and T. carnifex and their hybrids.
Trvalý link: http://hdl.handle.net/11104/0207621