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Modelling forest recolonization by an epiphytic lichen using a landscape genetic approach

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Abstract

The process of recolonization after disturbance is crucial for the persistence and dynamics of patch-tracking metapopulations. We developed a model to compare the spatial distribution and spatial genetic structure of the epiphytic lichen Lobaria pulmonaria within the perimeter of two reconstructed 19th century disturbances with a nearby reference area without stand-level disturbance. Population genetic data suggested that after stand-replacing disturbance, each plot was colonized by one or a few genotypes only, which subsequently spread clonally within a local neighborhood. The model (cellular automaton) aimed at testing the validity of this interpretation and at assessing the relative importance of local dispersal of clonal propagules vs. long-distance dispersal of clonal and/or sexual diaspores. A reasonable model fit was reached for the empirical data on host tree distribution, lichen distribution, and tree- and plot-level genotype diversity of the lichen in the reference area. Although model calibration suggested a predominance of local dispersal of clonal propagules, a substantial contribution of immigration of non-local genotypes by long-distance dispersal was needed to reach the observed levels of genotype diversity. The model could not fully explain the high degree of clonality after stand-replacing disturbance, suggesting that the dispersal process itself may not be stationary but depend on the ecological conditions related to disturbance.

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Authors and Affiliations

  1. WSL Swiss Federal Research Institute, 8903, Birmensdorf, Switzerland

    Helene H. Wagner, Silke Werth, Jesse M. Kalwij, Jacqueline C. Bolli & Christoph Scheidegger

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  1. Helene H. Wagner
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  2. Silke Werth
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  3. Jesse M. Kalwij
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  4. Jacqueline C. Bolli
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  5. Christoph Scheidegger
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Correspondence to Helene H. Wagner.

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Wagner, H.H., Werth, S., Kalwij, J.M. et al. Modelling forest recolonization by an epiphytic lichen using a landscape genetic approach. Landscape Ecol 21, 849–865 (2006). https://doi.org/10.1007/s10980-005-5567-7

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