Internal heterogeneity of ramet and flower densities of <Emphasis Type="Italic">Typha angustifolia</Emphasis> near the boundary of the stand |
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Authors: | Takashi Asaeda Le Quoc Hung |
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Institution: | (1) Department of Environmental Science and Human Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama-ken 338-8570, Japan |
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Abstract: | Fifteen relatively narrow stands of Typha angustifolia, including both stands bounded to open water and ridged boundary, were investigated in terms of the distributions of ramet
density as well as the fraction of flowering ramets. The ramet density, fraction of flowering ramet and morphological characteristics
of ramets were measured continuously from one side of the stand to the other, together with depth and the nutrient concentration
of pore water. The rhizome biomass was also measured at the periphery and at the center of the stand. The results indicated
that the shoot density declined gradually from the edge to the center, however, the fraction of the flowering ramets were
significantly higher at the edge while it rapidly declined away from the edge. Statistical analyses indicate that the ramet
density depends on either depth or nutrient level of the pore water; however, the distance from the edge was the most probable
factor to reduce the fraction of the flowering ramets. The rhizome biomass was mostly larger at the periphery than at the
center, likely because the accumulation of the horizontal rhizomes as extension was blocked by the boundary. High flowering
fraction near the periphery was probably induced by the hormonal change caused by the blockage. However, a large fraction
of ramets flowered simultaneously with large rhizome biomass at the periphery, likely because of the preferable light climates
compared with inside the stand. |
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Keywords: | Typha angustifolia Reproduction strategy Flowering ramets Vegetative reproduction Boundary effects |
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