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Contents : Entomol. Austriaca 5 /2002 Entomological Colloquium 2001 Salzburg Untersuchungen zur Ameisenfauna (Hymenoptera Formicidae) einer Wildflusslandschaft (Tennengau Salzburg) Studies into the ant fauna (Hymenoptera Formicidae) of a wild-river landscape (Tennengau Salzburg) Sonja Weber Institut f r Zoologie Universit t Salzburg Hellbrunnerstr. 34 A-5020 Salzburg Abstract Ecological field investigations of the ant fauna (Hymenoptera Formicidae) of a natural floodplain (Tennengau Salzburg). - In summer 1998 and 1999 the ant fauna of 5 biotopes - gravel bank Salicetum eleagnii Erico-Pinetum sylvestris Alnetum incanae and a pine forest - situated in the Tauglgries was investigated. Three methods were applied in this study (direct counting of ant nests baited pitfall traps and additional sampling by hand). A total of 27 ant species (about 25% from Austria) out of 10 genera (Lasius Formica Camponotus Manica Myrmica Leptothorax Myrmecina Fotmicoxenus Tetramorium Ponera) was identified in the area. The highest species number was found in the xerothermic Erico-Pinetum sylvestris (22 species). The average nest densities in the investigation areas were between 0 07 and 48 nests per 100 m! . By means of aj luster analysis of the nest-dominances 4 ant communities were found. The environmental needs of the ant species from 5 study areas were described by analysis of the relation of the species numbers and the nest densities to plant indicator values such as temperature soil moisture and soil nitrogen (ELLENBERG et a l. 1992) and vegetation density. The ecological characterization and analysis of autoecological requirements concerning ant habitats on the one hand were given by the division of ant species according to the average of tolerance towards temperature soil moisture soil nitrogen and vegetation density and on the other hand by the classification of biotopes through the number of nests and species and by the division of ant species according to their affiliation to preferred nesttypes. Since natural floodplains in Central Europe are already rare and endangered reasons for the need of protection were examined more closely. The most important aims of protection are the preservation and the promotion of the great variety F A (3 Arten) Manica rubida (63 1) Formica lefrancoisi (33 8) Myrmica hellenica (3 2) F.B (7 Arten) Manica rubida (35 3) Formica lefrancoisi (19 4) Myrmica hellenica (18 5) Ponera coarctata (18 3) Leptothorax acervorum (4 9) Camponotus ligniperda (3 6) Myrmica rubra of biotopes and the numerous but already threatened species of animals (especially invertebrates) which are especially adapted to xerothermic environmental standards. Keywords Ant fauna nest densities Xerothermophily affiliation to biotopes Red List of ants succession floodplain Tauglgries In den Sommern 1998 und 1999 wurde die Ameisenfauna von f nf Biotopen (Schotterbank Lavendelweidengeh lz Schneeheide-Kiefernwald Grauerlenau Fichtenwald) der Wildflusslandschaft an der Taugl (Tennengau Salzburg) untersucht. Die im (seit 2001) gesch tzten Landschaftsteil 'Tauglgries" gelegenen Biotope wurden durch die Bestimmung verschiedener Umweltparameter sowie die Berechnung mittlerer pflanzensoziologischer Zeigerwerte (ELLENBERG et al. 1992) charakterisiert. ber die Methoden der quantitativen Nestdichtenerhebungen in festgelegten Kartierungsfl chen der K der-Barberfallen und der qualitativen Aufsammlungen au erhalb der Kartierungsfl chen wurden 27 Ameisenarten (ca. ein Viertel der Arten sterreichs) aus 10 Gattungen (Lasius Formica Camponotus Manica Myrmica Leptothorax Myrmecina Formicoxenus Tetramorium Ponera) erfasst. Dabei entfielen auf den mikroklimatisch und strukturell vielf ltigsten Lebensraum des Schneeheide-Kiefernwaldes 22 Arten (81 5% aller Ameisenarten). F. C (22 Arten) Leptothorax nigriceps (20) Ponera coarctata (14 4) Tetramorium sp. (12 9) Lasius flavus( 2 &) Manica rubida (10 5) Leptothorax unifasciatus (6 7) Lasius paralienus (6 1) Myrmica hellenica (3 6) Leptothorax acervorum (3 3) Formica fiisca (2 5) Camponotus ligniperda (2 4) Myrmecina graminicola (1 7) Leptothorax interruptus (1 1) Leptothorax albipennis (0 5) Myrmica sabuleti (0 5) Formica cunicularia (0 4) Formica lefrancoisi (0 4) Formica truncorum (0 03) Myrmica rubra Myrmica schenki Lasius niger Lasius platythorax F. D (2 Arten) Myrmica rubra (100) Lasius platythorax F. E (4 Arten) Myrmica ruginodis (82 7) Formica polyctena (0 9) Leptothorax slavonicus (16 4) Formicoxenus nitidulus Tab. 1 : Artenspektrum der f nf Biotope. Fl che A Schotterbank B Lavendelweidengeh lz C Schneeheide-Kiefernwald D Grauerlenau F Fichtenwald. In Klammern angef hrte Zahlen: Nestdominanzen der Ameisenarten (Relative Anteile der Nestzahlen der einzelnen Arten an der Gesamtnestzahl der jeweiligen Biotope) Entomological Society of Austria 16 Entomol. Austriaca 5/2002 Entomologisches Kolloquium 2001

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