Increased rates of dispersal of free-ranging cane toads (Rhinella marina) during their global invasion

Shine, Richard, Alford, Ross A., Blennerhasset, Ryan, Brown, Gregory P., DeVore, Jayna L., Ducatez, Simon, Finnerty, Patrick, Greenlees, Matthew, Kaiser, Shannon W., McCann, Samantha, Pettit, Lachlan, Pizzatto, Ligia, Schwarzkopf, Lin, Ward-Fear, Georgia, and Phillips, Benjamin L. (2021) Increased rates of dispersal of free-ranging cane toads (Rhinella marina) during their global invasion. Scientific Reports, 11. 23574.

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Abstract

Invasions often accelerate through time, as dispersal-enhancing traits accumulate at the expanding range edge. How does the dispersal behaviour of individual organisms shift to increase rates of population spread? We collate data from 44 radio-tracking studies (in total, of 650 animals) of cane toads (Rhinella marina) to quantify distances moved per day, and the frequency of displacement in their native range (French Guiana) and two invaded areas (Hawai'i and Australia). We show that toads in their native-range, Hawai'i and eastern Australia are relatively sedentary, while toads dispersing across tropical Australia increased their daily distances travelled from 20 to 200 m per day. That increase reflects an increasing propensity to change diurnal retreat sites every day, as well as to move further during each nocturnal displacement. Daily changes in retreat site evolved earlier than did changes in distances moved per night, indicating a breakdown in philopatry before other movement behaviours were optimised to maximise dispersal.

Item ID: 72370
Item Type: Article (Research - C1)
ISSN: 2045-2322
Copyright Information: © 2021 Chapman et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Funders: Australian Research Council (ARC)
Projects and Grants: ARC FL120100074
Date Deposited: 09 Feb 2022 14:33
FoR Codes: 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410401 Conservation and biodiversity @ 100%
SEO Codes: 18 ENVIRONMENTAL MANAGEMENT > 1806 Terrestrial systems and management > 180606 Terrestrial biodiversity @ 100%
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