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  • 1
    Electronic Resource
    Electronic Resource
    Plant communities and conservation of Botrychium-rich grasslands in the Bitcherland (Northern Vosges Biosphere Reserve, France) (1999)
    Springer
    Biodiversity and conservation 8 (1999), S. 1519-1532 
    Details
    ISSN: 1572-9710
    Keywords: Botrychium ; Pteridophyte ; grassland ; conservation ; plant community
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two species of Botrychium are present in the Bitcherland grasslands, B. lunaria and B. matricariifolium, and both are protected in this territory. They occur in five different continental grassland communities, (i) a dune grassland (Diantho-Armerietum), (ii) a mesotrophic sandy grassland (Viscario-Avenetum), composed of three sub-units, therophitic ( V.A. airetosum), meso-eutrophic (V.A. saxifragetosum) and acidic (V.A. violetosum caninae), and (iii) an oligotrophic sandy grassland (Aveno-Genistetum). Both species of Botrychium appear in the three sub-units of Viscario-Avenetum, but only one in Diantho-Armerietum (B. matricariifolium) and in Aveno-Genistetum (B. lunaria). These Botrychium species are present in quite similar habitats in other lowland areas in Central Europe. The conservation of these threatened species, sensitive to plant competition, requires the maintenance or restoration of extensive agricultural management with late cutting and no fertilization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008988709046
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  • 2
    Electronic Resource
    Electronic Resource
    Phytosociology and conservation of Carex hordeistichos Vill. in the Lorraine region (France) (1999)
    Springer
    Biodiversity and conservation 8 (1999), S. 1435-1445 
    Details
    ISSN: 1572-9710
    Keywords: clay ; conservation ; pasture ; phytosociology ; ruderal plant ; trampling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Carex hordeistichos is a peri-Mediterranean species, which is rare over all its distribution range. In Lorraine (France), where the field investigations were conducted, as in other Western European areas, it is present only in secondary habitats, constituted of heavily trampled wet pastures and vehicle tracks on clayed soils. All plant communities with Carex hordeistichos described from Western European areas can be linked to the Carici hordeistichi-Trifolietum fragiferi association, classified in the Agropyro-Rumicion wet pasture alliance. The conservation of this threatened ruderal plant requires the maintenance of a high disturbance level through grazing, trampling and soil packing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008956506479
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Assessment of the bio-indicator capacity of aquatic macrophytes using multivariate analysis (1995)
    Springer
    Hydrobiologia 300-301 (1995), S. 115-122 
    Details
    ISSN: 1573-5117
    Keywords: macrophytes ; streams ; PCA ; HAC ; bio-indicator ; water chemistry ; geology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aquatic vegetation of twenty one streams, located at the head of watersheds and representative of the geological diversity of the Lorraine, was analysed with regard to its environmental d escriptors (geology, morphometry and water chemistry). A Principal Components Analysis was carried out on the data (230 stations and 134 variables). using 40 active chemical and morphometrical variables. This procedure was followed by a Hierarchical Ascending Classification for grouping the variables into classes. The analysis of the mesological and chemical structures of the streams indicated the dominance of geochemical parameters compared to pollution parameters. The indicator capacity of several species was revealed, e.g. Scapania undulata for weakly mineralized, oligotrophic waters; Potamogeton pectinatus for eutrophicated waters and Ranunculus fluitans for high nitrate levels. Five species groups characterizing the geology and mineralization as well as the perturbations in the quality of the water or the environment were identified (e.g. pollution, eutrophication, reposition and reshaping).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024453
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  • 4
    Electronic Resource
    Electronic Resource
    A macrophyte communities sequence as an indicator of eutrophication and acidification levels in weakly mineralised streams in north-eastern France (1999)
    Springer
    Hydrobiologia 410 (1999), S. 17-24 
    Details
    ISSN: 1573-5117
    Keywords: eutrophication ; acidification ; macrophyte communities ; weakly mineralized streams ; France
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Northern Vosges streams are subjected to acidification upstream and to eutrophication downstream. A bio-indicator scale of the degree of eutrophication and of the level of acidification, based on four aquatic macrophyte communities, was established in these weakly mineralized streams. Aquatic plant communities therefore begin as Group A, develop into Group B and become Group C or D downstream. The A community was characterized by bryophytes (Scapania undulata, Sphagnum sp.) and Potamogeton polygonifolius in oligotrophic, acidified to weakly acidified, and poorly buffered streams. The B community, defined by P. polygonifolius and the appearance of Ranunculus peltatus and Callitriche species (C. platycarpa, C. hamulata) was found in oligotrophic waters with a higher buffer capacity than the A community. The C community was determined by the disappearance of P. polygonifolius and the appearance of Elodea species (E. canadensis, E. nuttallii) and rare species in mesotrophic and neutral streams. The D community, with very high nutrient loading, was characterized by the abundance of Callitriche obtusangula, by the presence of Amblystegium riparium, Fissidens crassipes and the development of filamentous algae. This macrophyte sequence corresponded to an upstream to downstream zonation, which was characterized by an increase in buffer capacity and in nutrient levels and a decrease in protons and aluminium load.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003829921752
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Automated Synthesis of Recursive Programs from a ∀∃ Logical Specification (1998)
    Springer
    Journal of automated reasoning 21 (1998), S. 233-275 
    Details
    ISSN: 1573-0670
    Keywords: automated reasoning ; program synthesis ; theorem proving ; test set ; inductive reasoning ; term rewriting systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The specification of a function is often given by a logical formula, called a ∀∃-formula, of the following form: ∀x∃yΦ(x,y). More precisely, a specification is given in the context of a certain theory E and is stated by the judgment E ⊢ ∀x∃y Φ(x,y). In this paper, we consider the case in which E is an equational theory. It is divided into two parts. In the first part, we develop a theory for the automated proof of such judgments in the initial model ofE . The validity in the initial model means that we consider not only equational theorems but also inductive ones. From our theory we deduce an automated method for the proof of a class of such judgments. In the second part, we present an automatedmethod for program synthesis. We show how the previous proof method can be used to generate a recursive program for a function f that satisfies a judgment E ⊢ ∀x Φ(x, f(x)). We illustrate our method with the automated synthesis of some recursive programs on domains such as integers and lists. Finally, we describe our system LEMMA, which is an implementation in Common Lisp of these new methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005903504159
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  • 6
    Electronic Resource
    Electronic Resource
    The impact of eutrophication on aquaticmacrophyte diversity in weakly mineralized streams in the Northern Vosges mountains(NE France) (1998)
    Springer
    Biodiversity and conservation 7 (1998), S. 1051-1068 
    Details
    ISSN: 1572-9710
    Keywords: specific richness ; diversity ; macrophyte communities ; stream ; Northern Vosges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationships between water chemistry and aquatic macrophyte species were studied in an attempt to evaluate the impact of eutrophication on aquatic macrophyte diversity in weakly mineralized streams in the Northern Vosges mountains (NE France). The macrophyte specific richness and abundance increased along an upstream to downstream zonation, which was characterized by an increase in mineralization and nutrient levels. A comparison of aquatic macrophyte diversity of two streams has shown the impact of human-induced perturbations (fish-farms, domestic sewage) in such weakly mineralized and poorly buffered waters. Disturbed sites with very high nutrient loading were characterized by a low vascular plant richness and by the presence of filamentous algae. In order to preserve the floristic diversity of weakly mineralized streams, water quality should be improved, the riverbanks restored and discharges reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008809131487
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  • 7
    Electronic Resource
    Electronic Resource
    Assessing occurrence and habitat of Ophioglossum vulgatum L. and other Ophioglossaceae in European forests. Significance for nature conservation (2000)
    Springer
    Biodiversity and conservation 9 (2000), S. 673-681 
    Details
    ISSN: 1572-9710
    Keywords: adder's Tongue ; Botrychium sp. ; grapefern ; oak-ash forest ; phytosociology ; pteridophytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ophioglossum vulgatum has been discovered in several Lorraine forests with numerous populations on Keuper clay substrata. In all these forests, it occurs in the same plant community type, a hygrophilic oak-ash forest belonging to the Carpinion alliance. O. vulgatum is present in all stages of the forest cycle, but it is most abundant in young succession stages. This misrecognized forest habitat of O. vulgatum represents a primary habitat for this species and also a refuge, in which it is much less threatened than in wet grassland ecosystems. A review is given of all published data related to this Ophioglossum in European forests and comparisons are made with the occurrence of other European Ophioglossaceae in forest communities, in particular Botrychium virginianum in boreal and subalpine forests and B. matricariifolium in montane and lowland forests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008996613350
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    Paper (German National Licenses)
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