|Verhandlungen - Volume 137, (2000)
- HOFER A. & WAITZBAUER W., 2000: Contribution to the insect fauna of the Nature Reserve Eichkogel near Mödling/Lower Austria. 1. Selected groups of Diptera of dry grass habitats.
123 Diptera species from 28 families of the groups Orthorrhapha, Aschiza and Acalyptratae were captured with pitfall traps and hand nets on three dry turf sites of the Nature Reserve Eichkogel near Mödling in Lower Austria between March and November 1994. Tricimba brachyptera (Chloropidae) dominates all three research areas. Most remarkable is the occurrence of the Mediterranean species Phthiria gaedii (Bombyliidae) and Rhagio funebris (Rhagionidae) as well as the Pannonian species Dysmachus bifurcatus (Asilidae). The collections were carried out in the framework of a program designed to protect the unique composition of the fauna and flora at the Eichkogel.
- PEIRITSCH J., 2000: Beetles inhabiting sheep droppings in dry pastures on the Hundsheimer Berg (eastern Austria).
The species composition of the beetles inhabiting sheep droppings on the dry pastures in the Nature Reserve on the Hundsheimer Berg (eastern Austria) is analysed. Geotrupidae, Scarabaeidae, Aphodiidae (17 species), Staphylinidae (nine species determined), Histeridae (four species) and Hydrophilidae (four species) were found, whereby the first two families dominate in both the number of species and individuals. Twelve Scarabaeidae species, most of them Aphodiinae, were found on the Hundsheimer Berg for the first time. There are numerous records of interesting thermophilous beetles, for example Pachylister inaequalis OL. (Histeridae), Ontophagus verticicornis LAICH. and Ontophagus lemur F. (Scarabaeidae).
- PEIRITSCH J. & WAITZBAUER W., 2000: The impact of sheep grazing as a conservation measure for dry pastures in eastern Austria (Hundsheimer Berge).
On the periodically grazed dry pastures of the Hundsheimer Berg near Hainburg/ Donau (eastern Lower Austria) research took place to determine the effects of grazing by sheep. The surface biomass, its energy value and the utilization ratio during one season were the parameters measured. The temporal changes in nitrate and C/N ratio of soil and dung samples were also determined. The reduction in the quantity of the sheep dung at the pasture was recorded three times in one season. A maximum surface biomass of 396 g dry weight/m² was reached in August. The consumption of overall plant mass was low. At equal grazing intensity it amounted to 38 % in May and only 17 % in August. The total nitrogen of the soil samples was within standard range; the C/N ratio indicated high biological activity. The reduction of sheep dung occurred mainly in the first two weeks after defecation. Thereafter the reduction depended highly on the seasonal changes in moisture and temperature.
- POVOLNÝ D., 2000: Contribution to the flesh-fly fauna of the Hundsheimer Berg (Lower Austria).
In 1996-1998, the flesh-fly species composition of aggregations of so-called "hill-topping-situations" was periodically studied on the Hundsheimer Berg during the vegetation period. A total of 3618 males belonging to 34 species of flesh-flies was collected. The species diversity is 2.34. This study proved the Hundsheimer Berge to be a crossway where thermophilous Eastern Mediterranean elements meet in forest stands with the Carpathoendemic taxa accompanying the lower tiers of the deciduous forest. The comparatively extensive tourism also enables the occurrence of thermophilous subtropical-tropical elements such as Liopygia crassipalpis, whose present colony has reached one of its northwesternmost borderlines. The stenothermic flesh-fly Heteronychia rohdendorfi was recorded for Austria for the first time, as were Liosarcophaga portschinskyi, Sarcophaga bachmayeri and Sarcophaga zumptiana.
- RIEDL B., 2000: A survey of selected arthropod groups from a natural xerothermic dry grass site on the southwest slope of the Braunsberg near Hainburg (Lower Austria).
Seventynine spider species from 17 families were collected with pitfalls and by hand on a xerothermic site on the Hainburger Braunsberg in eastern Lower Austria between April 11th and October 30th 1996. Gnaphosidae and Erigonidae dominate, followed by Thomisidae and Lycosidae. Salticidae and Linyphiidae also have a high number of species. The record list contains a considerable number of thermophilic and often rare species, including numerous faunistically and zoogeographically important elements. Among the remaining arthropods 49 Heteroptera species from 13 families (Lygaeosoma sardeum dominates) were captured. The selected beetle groups were represented with 38 Staphylinidae species (Ocypus olens dominates), 31 Curculionidae species and 13 Halticinae species. The xerothermic sites in eastern Austria, specifically the natural areas, exhibit a high species richness because many elements are dependent on pristine open landscapes and are therefore missing in cultivated areas. A comparison with the grazed north slope will provide information on potential conservation measures.
- SCHRATT-EHRENDORFER L., 2000: History and present situation of xeric alluvial biotopes along the Danube near Vienna (Lobau).
The historical development since 1860 and the present situation of xeric alluvial biotopes along the Danube southeast of Vienna are compared and the successional processes documented. The floristic composition of the species-rich xeric alluvial vegetation is described. This vegetation type is important in respect to the conservation of rare and endangered species.
- SCHRATT-EHRENDORFER L., 2000: Successional tendencies of vegetation types at special habitats of the Danubian floodplains near Vienna (Untere Lobau).
The retreat and expansion as well as the new appearance of vegetation entities at special habitats of the "Untere Lobau" (alluvial area along the Danube downstream of Vienna) are documented. These changes of vegetation are shown to be linked to the regulation of the Danube in the second half of the 19th century. On that basis one can attempt to estimate the further development of these special habitats under the influence of a forthcoming water enhancement of the "Untere Lobau" with nutrient-rich water from the main channel of the Danube.
- TRÖSTL R., 2000: On the occurrence of Orcula dolium (DRAPARNAUD, 1801) in the Flysch-Wienerwald.
Orcula dolium specimens were collected in the north-eastern part of the Wienerwald from 1988-1990. Shell morphology indicates that the separation of the subspecies Orcula d. dolium and O. d. infima may be invalid.
- TRÖSTL R., 2000: Defining supraspecific gastropod taxa: a faunistic-ecological approach.
How to define supraspecific taxa remains a topic of discussion in malacology. The present paper focuses on this issue from a faunistic-ecological viewpoint, developing a classificatory model.
- FISCHER R., 2000: Rare forest communities along the Traunsee.
During the vegetation period 1999, rare forest communities along the shores of the Traunsee were described and classified according to the BRAUN-BLANQUET (1964) approach. Four forest communities were described: Calamigrostio variae-Pinetum sylvestris (OBERDORFER 57), Arunco-Aceretum (MOOR 52), Phyllitido-Aceretum (MOOR 52), Aceri platanoidis-Tilietum plathyphylli (FABER 36). The forest communities described here are typical shelter forests.
- BARTOSOVÁ M. & POVOLNÝ D., 1999: Heavy metal contents of flesh-flies and their hosts from selected habitats in Lower Austria and South Moravia.
Heavy metal analyses in the chain soil - plants - earthworms - snails - flesh-flies were performed in 1996-1998 in three habitats of South Moravia and four habitats of Lower Austria. Samples of all above groups were taken in regular intervals to shed light on the environmental heavy metal impact within the frame of long-term ecotoxicological investigations in Central Europe. The following numbers of samples were chemically analysed in individual groups: soil (128 samples), plants (137), earthworms (307), snails (365) and flesh-flies (303). The soil analyses show that South Moravian habitats generally suffered from Cd and Pb impact more than those of neighbouring Lower Austria. The low Pb impact on habitats in Lower Austria possibly results from the long-term use of lead-free fuel in traffic. Increased Cu values were found in the vicinity of vineyarding districts. Highest Cd values were generally found in earthworms, which are used as bioindicators of environmental heavy metal impact in ecotoxicology. Cd levels in snails and flesh-flies amounted to about half those in earthworms. Zn and Cu levels were comparatively low in invertebrates. Pb contents in plants were several times higher than Cd contents. In these cases the distance of the plant samples from heavy metal sources was decisive.
- BALÁTOVÁ-TULÁCKOVÁ E., 2000: Communities of the Molinietalia order in the "Orlické hory Protected Landscape Area" (Northeast Bohemia).
In the Orlické hory Protected Landscape Area, eleven associations of the Molinietalia order were established. They are as follows: (A) moist meadows of the Calthenion suballiance: Chaerophyllo hirsuti-Calthetum, Scirpetum sylvatici, Polygono-Cirsietum palustris, Angelico-Cirsietum palustris, Junco filiformis-Polygonetum, Cirsietum rivularis and Trollio-Cirsietum rivularis; (B) forb-rich communities of the Filipendulenion suballiance: Chaerophyllo hirsuti-Filipenduletum, Lysimachio vulgaris-Filipenduletum and Valeriano procurrentis-Filipenduletum; (C) community of the Molinion caeruleae alliance: Sanguisorbo-Festucetum commutatae (syn. Succiso-Festucetum commutatae). Each association is presented by a characteristic species combination and by phyto-sociological relevés. Attention was also paid to their chorology and macroecology as well as to their diversity in relation to the number of species in one relevé and to the number of subassociations.
- KIRÁLY G., 2000: New results of floristic research in the western border region of Hungary.
In Hungary's western border region, adjacent to Austria and Slovenia, floristic research had been interrupted for several decades. In spite of its small surface area, the region is biogeographically important because of its high proportion of subalpine floristic elements. In the late 1980s, botanical fieldwork was taken up again, yielding remarkable results. The present study reports on the occurrence of 23 vascular plant taxa. New for Hungary are Lysimachia nemorum, Epipactis gracilis, E. nordeniorum and E. albensis, new for western Hungary Campanula latifolia and Epipogium aphyllum. Other species have been confirmed by new records after an interval of more than fifty years: Chaerophyllum hirsutum, Teucrium scorodonia, Thlaspi caerulescens, Cardamine trifolia, Glyceria declinata. New for the Austrian province of Burgenland is Asplenium scolopendrium.
- SIEGHARDT H., PUNZ W. & REIMITZ R., 2000: Anatomical studies on plants from the "Eislöcher" in Eppan (South Tyrol/Italy).
The leaf and stem anatomy of eight plant species from a hypothermic locality were compared with the same species from the surroundings. In stems, a thicker secondary cortex and narrower annual rings were recorded. Only slight differences could be observed in leaves.
- PAVLICEV M., PUNZ W. & MAIER R., 2000: Ecosystem-based analysis of material and energy fluxes in Ptuj (Slovenia).
The area of Ptuj, a city in Northern Slovenia, was investigated by means of the ÖSSA, a synoptical method combining ecosystem-based structural analysis with calculations of natural and anthropogenic fluxes. Per-capita-data of annual resource consumption are 510 kg food, 605 kg goods, 98 880 l water, and 20.1 MWh energy, showing the same order of magnitude as other towns in the First World. Solar irradiation (1 010 MWh) exceeds the anthropogenic energy input by a factor of 100, providing a high potential for substitution of fossil energy. Due to the high percentage of agricultural area (46 %), natural and anthropogenic carbon are nearly balanced, and a high degree of self-sufficiency in the overall "urban ecosystem" would be possible. The results of the ÖSSA are designed to demonstrate the ecological "status" on a communal level, thus providing a new tool for sustainability-guided urban planning.
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