Hideki Mori1, Saneyoshi Ueno2, Asako Matsumoto2, Takashi Kamijo3, Yoshihiko Tsumura3, Takashi Masaki2. 1. Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki, Japan. 2. Forestry and Forest Products Research Institute, Tsukuba, Ibaraki, Japan. 3. Faculty of Life and Environmental Sciences, University of Tsukuba, Ibaraki, Japan.
Abstract
Background and Aims: Extensive clonal (vegetative) reproduction in lianas is a common and important life history strategy for regeneration and colonization success. However, few studies have evaluated the contribution of clonal reproduction to stand-level distribution of lianas in their natural habitat using genetic tools. The objectives of the present study were to investigate (1) the contribution of clonal reproduction to the distribution of Wisteria floribunda, (2) the size of clonal patches and (3) how the distribution patterns of W. floribunda clones are affected by micro-topography. Methods: The contribution of clonal reproduction to the distribution of the deciduous liana species W. floribunda was evaluated using genetic analysis across a 6-ha plot of an old-growth temperate forest in Japan and preference in landform between clonal ramets and non-clonal ramets was assessed. Key Results: Of the 391 ramets sampled, clonal reproduction contributed to 71 and 62 % of the total abundance and basal area, respectively, or 57 and 31 % when the largest ramet within a genet was excluded. The large contribution of clonal reproduction to the density and basal area of W. floribunda was consistent with previous observational studies. The largest genet included a patch size of 0.47 ha and ranged over 180 m. Preferred landforms of clonal and non-clonal ramets were significantly different when evaluated by both abundance and basal area. Non-clonal ramets distributed more on lower part of the slope than other landforms in comparison with clonal ramets and trees, possibly reflecting the limitation of clonal growth by stolons. Conclusions: Using genetic analysis, the present study found evidence of a large contribution of clonal reproduction on the distribution of W. floribunda in its natural habitat. The results indicate that clonal reproduction plays an important role not only in the formation of populations but also in determining the distribution patterns of liana species.
Background and Aims: Extensive clonal (vegetative) reproduction in lianas is a common and important life history strategy for regeneration and colonization success. However, few studies have evaluated the contribution of clonal reproduction to stand-level distribution of lianas in their natural habitat using genetic tools. The objectives of the present study were to investigate (1) the contribution of clonal reproduction to the distribution of Wisteria floribunda, (2) the size of clonal patches and (3) how the distribution patterns of W. floribunda clones are affected by micro-topography. Methods: The contribution of clonal reproduction to the distribution of the deciduous liana species W. floribunda was evaluated using genetic analysis across a 6-ha plot of an old-growth temperate forest in Japan and preference in landform between clonal ramets and non-clonal ramets was assessed. Key Results: Of the 391 ramets sampled, clonal reproduction contributed to 71 and 62 % of the total abundance and basal area, respectively, or 57 and 31 % when the largest ramet within a genet was excluded. The large contribution of clonal reproduction to the density and basal area of W. floribunda was consistent with previous observational studies. The largest genet included a patch size of 0.47 ha and ranged over 180 m. Preferred landforms of clonal and non-clonal ramets were significantly different when evaluated by both abundance and basal area. Non-clonal ramets distributed more on lower part of the slope than other landforms in comparison with clonal ramets and trees, possibly reflecting the limitation of clonal growth by stolons. Conclusions: Using genetic analysis, the present study found evidence of a large contribution of clonal reproduction on the distribution of W. floribunda in its natural habitat. The results indicate that clonal reproduction plays an important role not only in the formation of populations but also in determining the distribution patterns of liana species.
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