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  • Articles  (2)
  • Biodiversity Calcareous grassland Habitat fragmentation Species richness  (1)
  • Helicigona lapicida  (1)
  • Biology  (2)
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  • Articles  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Short-term responses of plants and invertebrates to experimental small-scale grassland fragmentation (2000)
    Springer
    Oecologia 125 (2000), S. 559-572 
    Details
    ISSN: 1432-1939
    Keywords: Biodiversity Calcareous grassland Habitat fragmentation Species richness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The fragmentation of natural habitats is generally considered to be a major threat to biodiversity. We investigated short-term responses of vascular plants (grasses and forbs) and four groups of invertebrates (ants, butterflies, grasshoppers and gastropods) to experimental fragmentation of calcareous grassland in the north-western Jura mountains, Switzerland. Three years after the initiation of fragmentation – which was created and maintained by mowing the area between the fragments – we compared species richness, diversity and composition of the different groups and the abundance of single species in fragments of different size (area: 20.25 m2, 2.25 m2 and 0.25 m2) with those in corresponding control plots. The abundances of 19 (29%) of the 65 common species examined were affected by fragmentation. However, the experimental fragmentation affected different taxonomic groups and single species to a different extent. Butterflies, the most mobile animals among the invertebrates studied, reacted most sensitively: species richness and foraging abundances of single butterfly species were lower in fragments than in control plots. Of the few other taxonomic groups or single species that were affected by the experimental fragmentation, most had a higher species richness or abundance in fragments than in control plots. This is probably because the type of fragmentation used is beneficial to some plants via decreased competition intensity along the fragment edges, and because some animals may use fragments as retreats between foraging bouts into the mown isolation area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420000483
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  • 2
    Electronic Resource
    Electronic Resource
    Sequestration of lichen compounds by three species of terrestrial snails (1995)
    Springer
    Journal of chemical ecology 21 (1995), S. 233-246 
    Details
    ISSN: 1573-1561
    Keywords: Balea perversa ; Chondrina clienta ; Helicigona lapicida ; Gastropoda ; Pulmonata ; crustous lichens ; lichen compounds ; sequestration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Three species of lichen-grazing snails,Balea perversa, Chondria clienta, andHelicigona lapicida, all from the Swedish island of Öland, were found to sequester lichen compounds when feeding on the crustous lichen speciesAspicila calcarea, Caloplaca flavovirescens, Lecanora muralis, Physcia adscendens, Tephromela atra, andXanthoria parietina. The lichen compounds detected in the soft bodies of the snail species analyzed included the anthraquinone parietin, the depside atranorin, as well as a presumable degradation product of the latter. Other lichen compounds such as (+)-usnic acid or α-collatolic acid were not found in the soft bodies but were only detected in the feces, suggesting selective uptake of lichen compounds by the snails. In individuals ofC. clienta initially fed on the lichenX. parietina, the amount of sequestered parietin decreased over time on a parietin-free diet but was still detectable in the soft bodies after 28 days. In the ovoviviparous land snail,B. perversa, sequestered parietin was transferred from the mother to the eggs in the reproductive tract.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02036654
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    Paper (German National Licenses)
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