Theoretical Ecology

, Volume 4, Issue 2, pp 113–132 | Cite as

Mechanistic models of seed dispersal by wind

  • Ran Nathan
  • Gabriel G. Katul
  • Gil Bohrer
  • Anna Kuparinen
  • Merel B. Soons
  • Sally E. Thompson
  • Ana Trakhtenbrot
  • Henry S. Horn
Original paper

Abstract

Over the past century, various mechanistic models have been developed to estimate the magnitude of seed dispersal by wind, and to elucidate the relative importance of physical and biological factors affecting this passive transport process. The conceptual development has progressed from ballistic models, through models incorporating vertically variable mean horizontal windspeed and turbulent excursions, to models accounting for discrepancies between airflow and seed motion. Over hourly timescales, accounting for turbulent fluctuations in the vertical velocity component generally leads to a power-law dispersal kernel that is censored by an exponential cutoff far from the seed source. The parameters of this kernel vary with the flow field inside the canopy and the seed terminal velocity. Over the timescale of a dispersal season, with mean wind statistics derived from an “extreme-value” distribution, these distribution-tail effects are compounded by turbulent diffusion to yield seed dispersal distances that are two to three orders of magnitude longer than the corresponding ballistic models. These findings from analytic models engendered explicit simulations of the effects of turbulence on seed dispersal using computationally intensive fluid dynamics tools. This development marks a bifurcation in the approaches to wind dispersal, seeking either finer resolution of the dispersal mechanism at the scale of a single dispersal event, or mechanistically derived analytical dispersal kernels needed to resolve long-term and large-scale processes such as meta-population dynamics and range expansion. Because seed dispersal by wind is molded by processes operating over multiple scales, new insights will require novel theoretical tactics that blend these two approaches while preserving the key interactions across scales.

Keywords

Advection–diffusion models Ballistic models Canopy turbulence Large-eddy simulations Long-distance dispersal WALD dispersal kernel 

Supplementary material

12080_2011_115_MOESM1_ESM.pdf (88 kb)
ESM 1(PDF 88 kb)

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Ran Nathan
    • 1
  • Gabriel G. Katul
    • 2
    • 3
    • 4
  • Gil Bohrer
    • 5
  • Anna Kuparinen
    • 6
  • Merel B. Soons
    • 7
  • Sally E. Thompson
    • 2
  • Ana Trakhtenbrot
    • 1
  • Henry S. Horn
    • 8
  1. 1.Movement Ecology Laboratory, Department of Ecology, Evolution and Behavior, The Alexander Silberman Institute of Life Sciences, Edmond J. Safra CampusThe Hebrew University of JerusalemJerusalemIsrael
  2. 2.Nicholas School of the EnvironmentDuke UniversityDurhamUSA
  3. 3.Department of Civil and Environmental EngineeringDuke UniversityDurhamUSA
  4. 4.Dipartimento di Idraulica, Trasporti ed Infrastrutture CiviliPolitecnico di TorinoTorinoItaly
  5. 5.Department of Civil, Environmental & Geodetic EngineeringOhio State UniversityColumbusUSA
  6. 6.Ecological Genetics Research Unit, Department of BiosciencesUniversity of HelsinkiHelsinkiFinland
  7. 7.Ecology and Biodiversity Group, Institute of Environmental BiologyUtrecht UniversityUtrechtThe Netherlands
  8. 8.Department of Ecology and Evolutionary BiologyPrinceton UniversityPrincetonUSA

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