Invasion and rapid adaptation of guppies (Poecilia reticulata) across the Hawaiian Archipelago

Evolutionary Applications

Peter B. McIntyre¹  William C. Rosenthal¹  Peter J. Lisi¹  Kristine N. Moody²  Michael J. Blum²  Sean D. Schoville³  Robert B. Prather Jr.⁴  James Derek Hogan⁵ 

[1] Center for Limnology University of Wisconsin‐Madison Madison WI USA;Department of Ecology and Evolutionary Biology University of Tennessee Knoxville Knoxville TN USA;Department of Entomology University of Wisconsin‐Madison Madison WI USA;Department of Evolution, Ecology, and Organismal Biology University of California Riverside Riverside CA USA;Department of Life Sciences Texas A&M University‐Corpus Christi Corpus Christi TX USA;

关键词: biological adaptation;    Hawai‘i;    introduced species;    molecular evolution;    population genomics;   

DOI  :  10.1111/eva.13236

来源: DOAJ

【 摘 要 】

Abstract How much does natural selection, as opposed to genetic drift, admixture, and gene flow, contribute to the evolution of invasive species following introduction to a new environment? Here we assess how evolution can shape biological invasions by examining population genomic variation in non‐native guppies (Poecilia reticulata) introduced to the Hawaiian Islands approximately a century ago. By examining 18 invasive populations from four Hawaiian islands and four populations from the native range in northern South America, we reconstructed the history of introductions and evaluated population structure as well as the extent of ongoing gene flow across watersheds and among islands. Patterns of differentiation indicate that guppies have developed significant population structure, with little natural or human‐mediated gene flow having occurred among populations following introduction. Demographic modeling and admixture graph analyses together suggest that guppies were initially introduced to O‘ahu and Maui and then translocated to Hawai‘i and Kaua‘i. We detected evidence for only one introduction event from the native range, implying that any adaptive evolution in introduced populations likely utilized the genetic variation present in the founding population. Environmental association tests accounting for population structure identified loci exhibiting signatures of adaptive variation related to predators and landscape characteristics but not nutrient regimes. When paired with high estimates of effective population sizes and detectable population structure, the presence of environment‐associated loci supports the role of natural selection in shaping contemporary evolution of Hawaiian guppy populations. Our findings indicate that local adaptation may engender invasion success, particularly in species with life histories that facilitate rapid evolution. Finally, evidence of low gene flow between populations suggests that removal could be an effective approach to control invasive guppies across the Hawaiian archipelago.

【 授权许可】

Unknown