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Population structure of a threatened plant, Pulsatilla patens, in boreal forests: modelling relationships to overgrowth and site closure

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Abstract

Pulsatilla patens (L.) Mill. (Ranunculaceae) is a threatened plant which in Fennoscandia favours south-facing, warm slopes of pine-dominated esker forests. The cessation of cattle grazing, modern forestry practices, and especially efficient fire prevention have resulted in closure of undergrowth vegetation in these forests. Using generalized linear models (GLM), we studied the relationships between habitat factors (covers of field and ground layer and amount of litter) and the population structure of P. patens in 48 populations in Finland in order to identify favourable conditions for regeneration. The largest populations occurred at sites with intermediate values of both ground and field layer. The number of juvenile plants was also highest at intermediate values of ground layer. Dense moss layer and abundant litter had a negative effect on the flowering of P. patens. In conclusion, creation and maintenance of habitat heterogeneity to prevent the closure of undergrowth vegetation is of paramount importance for the successful reproduction of P. patens.

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Authors and Affiliations

  1. Nature Division, Finnish Environment Institute, P.O.Box 140, FIN-00251, Helsinki

    Mika Kalliovirta & Terhi Ryttäri

  2. Research Programme for Biodiversity, Finnish Environment Institute, P.O.Box 140, FIN-00251, Helsinki

    Risto K. Heikkinen

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  1. Mika Kalliovirta
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  2. Terhi Ryttäri
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  3. Risto K. Heikkinen
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Correspondence to Terhi Ryttäri.

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Kalliovirta, M., Ryttäri, T. & Heikkinen, R.K. Population structure of a threatened plant, Pulsatilla patens, in boreal forests: modelling relationships to overgrowth and site closure. Biodivers Conserv 15, 3095–3108 (2006). https://doi.org/10.1007/s10531-005-5403-z

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  • DOI: https://doi.org/10.1007/s10531-005-5403-z

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