Rapid shifts in dispersal behavior on an expanding range edge

Lindström, Tom, Brown, Gregory P., Sisson, Scott A., Phillips, Benjamin L., and Shine, Richard (2013) Rapid shifts in dispersal behavior on an expanding range edge. Proceedings of the National Academy of Sciences of the United States of America, 110 (33). pp. 13452-13456.

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Abstract

Dispersal biology at an invasion front differs from that of populations within the range core, because novel evolutionary and ecological processes come into play in the nonequilibrium conditions at expanding range edges. In a world where species' range limits are changing rapidly, we need to understand how individuals disperse at an invasion front. We analyzed an extensive dataset from radio-tracking invasive cane toads (Rhinella marina) over the first 8 y since they arrived at a site in tropical Australia. Movement patterns of toads in the invasion vanguard differed from those of individuals in the same area postcolonization. Our model discriminated encamped versus dispersive phases within each toad's movements and demonstrated that pioneer toads spent longer periods in dispersive mode and displayed longer, more directed movements while they were in dispersive mode. These analyses predict that overall displacement per year is more than twice as far for toads at the invasion front compared with those tracked a few years later at the same site. Studies on established populations (or even those a few years postestablishment) thus may massively underestimate dispersal rates at the leading edge of an expanding population. This, in turn, will cause us to underpredict the rates at which invasive organisms move into new territory and at which native taxa can expand into newly available habitat under climate change.

Item ID: 29288
Item Type: Article (Research - C1)
ISSN: 1091-6490
Keywords: hierarchical Bayes, shift, spatial sorting, relocation data, hidden states
Additional Information:

This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. 1073/pnas.1303157110/-/DCSupplemental.

Funders: Swedish Research Council, Australian Research Council (ARC)
Date Deposited: 11 Sep 2013 05:26
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060207 Population Ecology @ 100%
SEO Codes: 96 ENVIRONMENT > 9604 Control of Pests, Diseases and Exotic Species > 960405 Control of Pests, Diseases and Exotic Species at Regional or Larger Scales @ 100%
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