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A multi variate approach to the problem of decline in vigor of ammophila breviligulata



A multi variate approach to the problem of decline in vigor of ammophila breviligulata



Canadian Journal of Botany 60(8): 1371-1380



On stabilized sand dunes where sand deposition has ceased, A. breviligulata Fern. declines in vigor, flowers less prolifically and often remains vegetative. Many explanations for this decline have been put forward in the past. A comparative multivariate approach was chosen to address the problem. Random 1-m2 quadrats (59) were laid out over a young sand dune system near Port Franks, Ontario, Canada, on the southeastern, shore of Lake Huron. In each plot 6 environmental variables (sand deposition, sand flux, number of annual species, number of perennial species, soil temperature and the depth of the roots) and 4 plant characters of A. breviligulata (flowering percentage, shoot biomass, vegetative reproduction rate and shoot density) were recorded. The resulting data matrices were subjected to canonical correlation analysis. Of the environmental variables, sand deposition and root depth had strong relationships with shoot biomass (positive), flowering (positive) and vegetative reproduction rate (negative). Competition from annuals and perennials appeared a secondary factor in the decline of A. breviligulata. Flowering was rare in high shoot density sites with low levels of sand deposition and low density sites with greater number of annual species.

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Accession: 004590354

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