Abstract
Seed dispersal will be essential for plants to track future climate space, but dispersal capacity is rarely measured or incorporated into species distribution models. Using the entire alpine flora of the Snowy Mountains, south-eastern Australia, as a case study, we modelled the dispersal capacity of 198 species (93.4% of the flora) using the plant traits dispersal syndrome, seed mass, seed release height and growth form. The modelled maximum dispersal distances were mostly affected by dispersal syndrome of each species. The models reveal that 75% of species disperse up to 10 m, whilst 20% may disperse >100 m. Most species in this flora do not have any specific dispersal strategy, hence their inability to disperse >10 m. However, those species with longer modelled distances were dispersed by animals or wind (>600 and >140 m, respectively). This alpine flora has a low capacity for long-distance seed dispersal and is likely to suffer from migration lag as the local climate undergoes rapid changes.
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Acknowledgements
Sarah Fethers facilitated access to the ANBG seed bank database; Lydia Guja and Catherine Pickering kindly provided much of the seed mass data. Riin Tamme helped with dispersal modelling. Bob Parsons, Susanna Bryceson and Riin Tamme made helpful comments on the manuscript.
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Communicated by Paul M Ramsay.
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Appendix 1
Appendix 1
The mean maximum dispersal distance (m), and other species traits for all the species used in the study. Dispersal syndromes: animal, the seeds has hooks or barbs which catch on fur or hair, or the seed is bird dispersed; wind, the seeds have special appendages such as a bristle pappus which allows the seed to float through the air and be carried by the wind; ballistic, the seed is ejected from a dehiscent pod or capsule; gravity, the seed has no special dispersal adaptations and simply falls to the ground from the parent plant.
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Morgan, J.W., Venn, S.E. Alpine plant species have limited capacity for long-distance seed dispersal. Plant Ecol 218, 813–819 (2017). https://doi.org/10.1007/s11258-017-0731-0
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DOI: https://doi.org/10.1007/s11258-017-0731-0