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Article Dans Une Revue Diversity and Distributions Année : 2018

Modelling the distribution and compositional variation of plant communities at the continental scale

Borja Jiménez-Alfaro
Milan Chytrý
Michal Hájek
Jose Alvarez-Martinez
  • Fonction : Auteur
Jörg Brunet
Daniel Dítě
Xavier Font
  • Fonction : Auteur
Florian Jansen
Ute Jandt
Zygmunt Kącki
  • Fonction : Auteur
John Rodwell
  • Fonction : Auteur
Lucia Sekulová
  • Fonction : Auteur
Jozef Šibík
Željko Škvorc

Résumé

Aim: We investigate whether (1) environmental predictors allow to delineate the distribution of discrete community types at the continental scale and (2) how data completeness influences model generalization in relation to the compositional variation of the modelled entities. Location: Europe. Methods: We used comprehensive datasets of two community types of conservation concern in Europe: acidophilous beech forests and base‐rich fens. We computed community distribution models (CDMs) calibrated with environmental predictors to predict the occurrence of both community types, evaluating geographical transferability, interpolation and extrapolation under different scenarios of sampling bias. We used generalized dissimilarity modelling (GDM) to assess the role of geographical and environmental drivers in compositional variation within the predicted distributions. Results. For the two community types, CDMs computed for the whole study area provided good performance when evaluated by random cross‐validation and external validation. Geographical transferability provided lower but relatively good performance, while model extrapolation performed poorly when compared with interpolation. Generalized dissimilarity modelling showed a predominant effect of geographical distance on compositional variation, complemented with the environmental predictors that also influenced habitat suitability. Main conclusions: Correlative approaches typically used for modelling the distribution of individual species are also useful for delineating the potential area of occupancy of community types at the continental scale, when using consistent definitions of the modelled entity and high data completeness. The combination of CDMs with GDM further improves the understanding of diversity patterns of plant communities, providing spatially explicit information for mapping vegetation diversity and related habitat types at large scales.
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Dates et versions

hal-02357324 , version 1 (25-06-2024)

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Borja Jiménez-Alfaro, Susana Suárez-Seoane, Milan Chytrý, Stephan Hennekens, Wolfgang Willner, et al.. Modelling the distribution and compositional variation of plant communities at the continental scale. Diversity and Distributions, 2018, 24 (7), pp.978-990. ⟨10.1111/ddi.12736⟩. ⟨hal-02357324⟩
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