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  • 1
    Electronic Resource
    Electronic Resource
    Experimental study of pollination by ants in Mediterranean high mountain and arid habitats (1996)
    Springer
    Oecologia 105 (1996), S. 236-242 
    Details
    ISSN: 1432-1939
    Keywords: Ant pollination ; High-mountain ecology ; Mediterranean habitats ; Mutualism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In this paper, we report the results of an experimental study on ant pollination of three plant species inhabiting the Mediterranean high mountains (Alyssum purpureum, Arenaria tetraquetra and Sedum anglicum) and four species inhabiting the aridlands (Lepidium subulatum, Gypsophyla struthium, Frankenia thymifolia and Retama sphaerocarpa) of South-eastern Spain. We determined several plant and ant traits, as well as the composition and abundance of the pollinator assemblage. Insects belonging to 29 families and five orders visited the flowers of the plant species studied. In all but two, L. subulatum and G. struthium, the ants comprised 70–100% of the flower visitors. The results clearly show that five out of seven of these plant species were pollinated by ants. The role of the ants as pollinators seems to depend heavily on the relative abundance of the ants with respect to the other species of the pollinator assemblage, ant pollination becoming evident when ants outnumber other floral visitors. The ant-pollination systems analysed in this study may be the result of prevailing ecological conditions more than an evolutionary result of a specialized interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328552
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  • 2
    Electronic Resource
    Electronic Resource
    Dislocation dynamics in confined geometry (1999)
    Springer
    Journal of computer-aided materials design 6 (1999), S. 157-164 
    Details
    ISSN: 1573-4900
    Keywords: Dislocation dynamics ; Frank-Read source ; Plasticity ; Simulation ; Thin film
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A simulation of dislocation dynamics has been used to calculate the critical stress for a threading dislocation moving in a confined geometry. The optimum conditions for conducting simulations in systems of various sizes, down to the nanometer range, are defined. The results are critically compared with the available theoretical and numerical estimates for the problem of dislocation motion in capped layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008730711221
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