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On the Relationship Between Clonal Traits and Small-Scale Spatial Patterns of Three Dominant Grasses and its Consequences on Community Diversity

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Abstract

In a secondary successional community, we focused on the role of local dispersion mediated by clonal growth in the density and spatial patterning of tillers of three dominant grass species (Elymus repens, Brachypodium pinnatum and Calamagrostis epigejos) on the plant neighbourhood scale. We also asked whether the spatial pattern/density of their tillers were linked to the local diversity structure. In ten 75 cm × 75 cm quadrats for each of the three species, we quantified i) the clonal morphology patterns from measuring spacer length, branching rate and the number of clumping tillers per module, ii) the spatial patterns and density of tillers in grids at four different resolutions (cell sizes varied between 1 cm × 1 cm; 2.5 cm × 2.5 cm; 5 cm × 5 cm and 7.5 cm × 7.5 cm), and iii) local species richness and local dominance based on botanical relevés. Then, we explored the relationships between iv) the clonal architecture pattern and the density/spatial pattern of tillers and v) the density/spatial pattern of tillers and local diversity variables, through regression analyses. Aggregation intensity on the smallest scales and tiller density were negatively linked to spacer length and positively linked to branching rate and number of clumping tillers. Species richness and dominance in quadrats were negatively and positively linked to tiller density, respectively. Dominance was positively linked to aggregation intensity on a 1-cm scale. This study emphasized and quantified the importance of clonal growth in the intensity and quality of grass tiller patterning in space on the plant neighbourhood scale. Our approach allowed the accurate positioning of species, or even clones on the phalanx-guerrilla continuum. This should help us to understand how dominant grass species affect the dynamics of stand communities.

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Acknowledgements

We are grateful to Sébastien De Danieli and Rémi Hanon for help in the field. We also would like to thank the associated editor and the referees for their valuable comments on the first versions of the manuscript.

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  1. Cemagref EMGR, Grenoble, 2 rue de la papeterie BP 76, FR-38402, Saint Martin d’Hères cedex, France

    Julien Pottier & André Evette

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  1. Julien Pottier
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  2. André Evette
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Correspondence to Julien Pottier.

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Pottier, J., Evette, A. On the Relationship Between Clonal Traits and Small-Scale Spatial Patterns of Three Dominant Grasses and its Consequences on Community Diversity. Folia Geobot 45, 59–75 (2010). https://doi.org/10.1007/s12224-009-9053-x

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