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    Density dependence in demography and dispersal generates fluctuating invasion speeds

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    Sullivan_etal_density_dependent_invasions_BioRxiv.pdf (1.699Mb)
    Date
    2017-04
    Author
    Sullivan, Lauren L.  Concept link
    Li, Bingtuan  Concept link
    Miller, Tom E. X.  Concept link
    Neubert, Michael G.  Concept link
    Shaw, Allison K.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8962
    As published
    https://doi.org/10.1073/pnas.1618744114
    Keyword
     Allee effects; Density-dependent dispersal; Integrodifference equations; Invasive species 
    Abstract
    Mitigating the spread of invasive species remains difficult—substantial variability in invasion speed is increasingly well-documented, but the sources of this variability are poorly understood. We report a mechanism for invasion speed variability. The combined action of density dependence in demography and dispersal can cause invasions to fluctuate, even in constant environments. Speed fluctuations occur through creation of a pushed invasion wave that moves forward not from small populations at the leading edge but instead, from larger, more established populations that “jump” forward past the previous invasion front. Variability in strength of the push generates fluctuating invasion speeds. Conditions giving rise to fluctuations are widely documented in nature, suggesting that an important source of invasion variability may be overlooked.
    Description
    Author Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences of the United States of America 114 (2017): 5053-5058, doi:10.1073/pnas.1618744114.
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    • Biology
    Suggested Citation
    Preprint: Sullivan, Lauren L., Li, Bingtuan, Miller, Tom E. X., Neubert, Michael G., Shaw, Allison K., "Density dependence in demography and dispersal generates fluctuating invasion speeds", 2017-04, https://doi.org/10.1073/pnas.1618744114, https://hdl.handle.net/1912/8962
     

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