Rapid shifts in dispersal behavior on an expanding range edge.
Proc Natl Acad Sci U S A
; 110(33): 13452-6, 2013 Aug 13.
Article
em En
| MEDLINE
| ID: mdl-23898175
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.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Comportamento Espacial
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Comportamento Animal
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Bufo marinus
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Evolução Biológica
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Distribuição Animal
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Modelos Biológicos
Tipo de estudo:
Prognostic_studies
Limite:
Animals
País como assunto:
Oceania
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article