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- W3100511334 abstract "Abstract Invasive species often exhibit rapid evolution following introduction, despite genetic bottlenecks that may result from small numbers of founders; however, some invasions may not fit this “genetic paradox.” The invasive cane toad (Rhinella marina) displays high phenotypic variation across its environmentally heterogeneous, introduced Australian range. Here, we used three genome-wide datasets to characterize population structure and genetic diversity in invasive toads: 1) RNA-Seq data from spleen sampled in the native range (French Guiana), and introduced populations from Hawai’i (the source of the Australian introduction) and Australia; 2) RNA-Seq data from brains sampled more extensively in Hawai’i and Australia; and 3) previously published RADSeq data from transects across Australia. We found that toads form three genetic clusters: (1) native range, (2) Hawai’i and long-established areas near introduction sites in Australia, and (3) more recently established northern Australian sites. In addition to strong divergence between native and invasive populations, we find evidence for a reduction in genetic diversity following introduction. However, we do not see this reduction in loci putatively under selection, suggesting that genetic diversity may have been maintained at ecologically relevant traits, or that mutation rates were high enough to maintain adaptive potential. Nonetheless, cane toads encounter novel environmental challenges in Australia and appear to respond to selection across environmental breaks; the transition between genetic clusters occurs at a point along the invasion transect where temperature rises and rainfall decreases. We identify loci known to be involved in resistance to heat and dehydration that show evidence of selection in Australian toads. Despite well-known predictions regarding genetic drift and spatial sorting during invasion, this study highlights that natural selection occurs rapidly and plays a vital role in shaping the structure of invasive populations." @default.
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- W3100511334 date "2019-03-17" @default.
- W3100511334 modified "2023-09-25" @default.
- W3100511334 title "Bottleneck revisited: increased adaptive variation despite reduced overall genetic diversity in a rapidly adapting invader" @default.
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- W3100511334 hasPublicationYear "2019" @default.
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