Spinal arthritis in invasive cane toads is linked to rate of dispersal as well as to latitude

Gregory P. Brown, Lin Schwarzkopf, Ross A. Alford, Deborah Bower, Richard Shine*

*Corresponding author for this work

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    Abstract

    Initial research on the spread of cane toads (Rhinella marina) through tropical Australia reported a high incidence of spinal arthritis (spondylosis) in toads at the invasion front (where toads disperse rapidly), but not in areas colonized earlier (where toads are more sedentary). The idea that spondylosis was a cost of rapid dispersal was challenged by wider spatial sampling which linked rates of spondylosis to hot (tropical) climates rather than to dispersal rates. Here, the authors of these competing interpretations collaborate to reinterpret the data. Our reanalysis supports both previous hypotheses; rates of spondylosis are higher in populations established by fast-dispersing toads, and are higher in tropical than in temperate environments; they are also higher in larger toads. The functional reason for climatic effects is unclear, but might involve effects on the soil-living bacteria involved in the induction of spondylosis; and/or may reflect higher movement (as opposed to dispersal) or more pronounced dry-season aggregation rates of toads in tropical conditions.

    Original languageEnglish
    Article number13965
    Pages (from-to)1-4
    Number of pages4
    JournalScientific Reports
    Volume9
    DOIs
    Publication statusPublished - 27 Sep 2019

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    Copyright the Author(s) 2019. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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