Weinlander M.,University of Innsbruck |
Weinlander M.,REVITAL Integrative Naturraumplanung GmbH |
Bou-Vinals A.,University of Innsbruck |
Fureder L.,University of Innsbruck
Freshwater Crayfish | Year: 2014
Despite the knowledge on the mechanisms causing population declines in European crayfish stocks (e.g., crayfish plague, alien species, habitat loss), the assessment and quantification of their threats have received insufficient attention. We aimed to assess the potential range of indigenous (ICS) and nonindigenous crayfish species (NICS) in Carinthia (Austria) by developing habitat suitability models of the native Astacus astacus and Austropotamobius torrentium, as well as the invasive Pacifastacus leniusculus. Based on landscape elements, we defined the level of fragmentation in catchments having ICS and NICS. This information was used, together with spatial distances to potentially plague carrying NICS, roads and settlements, to calculate a threat index evaluating the endangerment of each remaining ICS population (including Austropotamobius pallipes). We found A. torrentium had the widest potential distribution, while the potential range of A. astacus and P. leniusculus was mainly overlapping. Riverine and lacustrine landscapes with ICS and NICS occurrence were highly fragmented and logistic regression models showed that extinct ICS populations were positively associated with settlements, but negatively so to barriers. Existing stocks of Austropotamobius were less endangered than those of A. astacus since populations of the former are located at higher elevations resulting with lower human impacts. In contrast, P. leniusculus was associated with human infrastructures in the lowlands. The threat index identified the most endangered ICS populations. The tools and analyses applied here at the landscape level are helpful to establish catchment-based conservation plans for threatened ICS, and to predict the further spread of NICS. Copyright © 2014 by The Author(s).
Schumann K.,Goethe University Frankfurt |
Schumann K.,Biodiversity and Climate Research Center |
Gewolf S.,REVITAL Integrative Naturraumplanung GmbH |
Tackenberg O.,Goethe University Frankfurt
Alpine Botany | Year: 2016
Vegetation succession on glacier forelands has been well-studied. However, most of the studies investigated only one or few glacier forelands. We studied regional variations in vegetation succession on 16 glacier forelands in the European Alps. To improve our understanding of how vegetation succession is regulated by environmental conditions, we took edaphic and climatic factors into account. We collected vegetation data in three stages (early; middle; late) along a successional gradient on glacier forelands in the Eastern and Western European Alps. The progressions of species richness, vegetation cover and composition during primary succession were compared between these two regions. In addition, the effects of climatic and edaphic factors and grazing were tested. Our results reveal that the vegetation from the early stage did not differ between the regions and different elevations. With progressing time, and especially in the late successional stage, several vegetation differences emerged. The forelands of the Western Alps already developed to open shrubland, while the forelands of the Eastern Alps so far only developed toward grassland. Surprisingly, these differences cannot be explained by different precipitation amounts, but possibly by different regional species pools and elevations of the treelines. We conclude that a complex of edaphic factors closely related to terrain age, regional differences in the species pool, and the different elevation of the treeline in the eastern and western Alps mostly influenced later stages of primary succession on glacier forelands. © 2016 Swiss Botanical Society
Water power and/or nature conservation? - Analysis of options for the rehabilitation of the Lower Salzach River [Wasserkraft und/oder naturschutz? - Variantenuntersuchung zur Sanierung der Unteren Salzach]
Spannring M.,SKI GmbH Co.KG |
Hengl M.,Institute For Wasserbau Und Hydrometrische |
Michor K.,REVITAL Integrative Naturraumplanung GmbH |
Schaufler R.,Gewasserbezirk Braunau Am Inn |
Zinsser T.,Wasserwirtschaftsamt Traunstein
WasserWirtschaft | Year: 2013
For a river reach of the Lower Salzach River at the border between Germany and Austria an option analysis for a rehabilitation is currently being conducted concerning water engineering as well as freshwater-ecological measures. In addition to three options including only river engineering components, two further alternatives also offer an energy recovery model. In order to evaluate the different options, their impact is analysed in reference to clearly defined criteria. The findings will provide the basis for a decision for one alternative.
Michor K.,REVITAL Integrative Naturraumplanung GmbH
WasserWirtschaft | Year: 2013
Over the last 20 years a flood control strategy has been pursued on the Upper Drau in Carinthia (Austria), which is not set on "hard" control structures but natural water dynamics and synergies with nature conservation and recreational use. The basis for this is a water development concept from 1992, one of the first of its kind in Austria. Meanwhile, with financial support from the European Unions' LIFE-Natur-Fonds, around a quarter of the Upper Drau has been revitalised and the river together with its riparian zone has been declared a European Protected Area.
Hengl M.,Institute For Wasserbau Und Hydrometrische Prufung |
Aufleger M.,University of Innsbruck |
de Mas V.,Amt der Salzburger Landesregierung |
Eggertsberger J.,Amt der Salzburger Landesregierung |
And 8 more authors.
Osterreichische Wasser- und Abfallwirtschaft | Year: 2012
This example of the Lower Salzach's self-forming widening without bank reinforcements in the hinterland illustrates the complete process from creating a general concept of morphology- based measures, to planning and obtaining the necessary authorization, to the implementation and the first highly promising experiences from a hydrological year marked by a flood with a return period of once in 30 years. The idea of doing without state-of-the-art bank reinforcement techniques was a bold step on the part of the Bavarian and Austrian water management authorities. This not only serves the environment, but also saves the costs of building new bank reinforcements for the purpose of flood control that are normally necessary when rivers are widened. Self-forming widening is part of an overall concept employed to help the Lower Salzach gradually recover from its eroded state to a revitalized, morphologically dynamic and balanced one. It also creates a region that can simultaneously serve as an essential biotope and as a rest and recreation area for the local populace. © Springer-Verlag 2012.