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A theoretical analysis of the Allee effect in wind-pollinated cordgrass plant invasions

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  • Murphy, James T.
  • Johnson, Mark P.

Abstract

A new individual-based model is presented for investigating an important group of invasive plant species, from the genus Spartina, that threaten biodiversity in coastal and intertidal habitats around the world. The role of pollen limitation in influencing the early development of an invasion is explored in order to gain a greater understanding of the mechanistic basis for an apparent Allee effect (causal relationship between population size/density and mean individual fitness) observed in populations of invasive Spartina species. The model is used to explore how various factors such as atmospheric stability, wind direction/speed, pollen characteristics and spatial structure of the population affect the overall invasion dynamics and reproductive success. Comparisons were also made between invasive species of Spartina (S. alterniflora, S. anglica) and a non-invasive species (S. foliosa), showing a reduced Allee effect was associated with invasion success. Furthermore, the conclusions drawn here may give insights into some of the fundamental processes affecting the growth and population dynamics of other invasive wind-pollinated plants.

Suggested Citation

  • Murphy, James T. & Johnson, Mark P., 2015. "A theoretical analysis of the Allee effect in wind-pollinated cordgrass plant invasions," Theoretical Population Biology, Elsevier, vol. 106(C), pages 14-21.
    • Handle: RePEc:eee:thpobi:v:106:y:2015:i:c:p:14-21
    DOI: 10.1016/j.tpb.2015.10.004
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    1. James T. Murphy & Mark P. Johnson & Ray Walshe, 2013. "Modeling The Impact Of Spatial Structure On Growth Dynamics Of Invasive Plant Species," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 24(07), pages 1-20.
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    Cited by:

    1. Takahashi, Daisuke & Sim, Seung-Woo & Park, Eun-Jin, 2019. "Colonial population dynamics of Spartina alterniflora," Ecological Modelling, Elsevier, vol. 395(C), pages 45-50.

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    1. Takahashi, Daisuke & Sim, Seung-Woo & Park, Eun-Jin, 2019. "Colonial population dynamics of Spartina alterniflora," Ecological Modelling, Elsevier, vol. 395(C), pages 45-50.

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