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  • Cleistogamy  (1)
  • Plant density  (1)
  • Population analysis  (1)
  • 1985-1989  (2)
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  • 1985-1989  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Density-dependent flowering phenology, outcrossing, and reproduction in Impatiens capensis (1987)
    Springer
    Oecologia 72 (1987), S. 341-347 
    Details
    ISSN: 1432-1939
    Keywords: Plant density ; Cleistogamy ; Chasmogamy ; Phenology ; Seed production ; Impatiens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We investigated the effects of plant density on cleistogamous (CL) and chasmogamous (CH) flowering phenology and seed production in a natural Impatiens capensis population, by censusing individually marked plants at experimentally reduced and natural densities. CL flowering was earlier at natural density. This plastic density response may have resulted from a stress-related threshold for CL flowering; slower growing plants at natural density flowered earlier. Although apparently triggered by slow early growth, early CL flowering also involved an additional cost for later growth rate. In contrast, CH flowering was unrelated to relative growth rate, but apparently required a size threshold. Experimental density reduction resulted in earlier CH flowering and a dramatic increase in the percentage of plants producing CH flowers. Individual CL and CH flowering duration and flower production were greater at reduced density. These density-dependent effects caused differences between treatments in the shape and location of population flowering phenology curves. Moreover, the percentage of CH seeds produced per individual was much higher at reduced density. At natural density total seed production per plant was lower and more hierarchical than at lower density, suggesting that dominance and suppression shape jewelweed fitness distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377561
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  • 2
    Electronic Resource
    Electronic Resource
    Population analysis based on occupation numbers II. Relationship between shared electron numbers and bond energies and characterization of hypervalent contributions (1985)
    Springer
    Theoretical chemistry accounts 68 (1985), S. 231-245 
    Details
    ISSN: 1432-2234
    Keywords: Population analysis ; Bond energies ; Hypervalency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The population analysis based on occupation numbers, originally proposed by Davidson, is briefly reviewed. A new way is proposed to determine modified AOs and to characterize hypervalent contributions. This is discussed in application to the molecules NSF, NSF3, SF6, OPCl, OPCl2, O2PCl, SO2, ClO 4 − . It is the main objective of this work to investigate the connection between shared electron numbers σ — considered as a measure of covalent bond strength — and bond energies, σ is found to be a reliable measure of bond energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00526774
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    Paper (German National Licenses)
    Fulltext
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