History of the invasive African olive tree in Australia and Hawaii: evidence for sequential bottlenecks and hybridization with the Mediterranean olive

Evolutionary Applications

Guillaume Besnard¹  Jérémy Dupuy¹  Maximilien Larter⁴  Peter Cuneo²  David Cooke³ 

[1] Laboratoire Evolution & Diversité Biologique, CNRS, UPS, ENFA, UMR 5174, Toulouse, France;The Australian Botanic Garden, Mount Annan, Royal Botanic Gardens and Domain Trust, Mount Annan, NSW, Australia;Department of Primary Industries and Resources PIRSA, Biosecurity SA, Adelaide, SA, Australia;INRA, UMR 1202 BIOGECO, Université de Bordeaux, Talence, France

关键词: admixture;    approximate Bayesian computation;    biologic invasion;    cuspidata;    introgression;    microsatellites;    Olea europaea;    plastid DNA;   

DOI  :  10.1111/eva.12110

来源: Wiley

【 摘 要 】

Abstract

Humans have introduced plants and animals into new continents and islands with negative effects on local species. This has been the case of the olive that was introduced in Australia, New Zealand and Pacific islands where it became invasive. Two subspecies were introduced in Australia, and each successfully invaded a specific area: the African olive in New South Wales (NSW) and the Mediterranean olive in South Australia. Here, we examine their origins and spread and analyse a large sample of native and invasive accessions with chloroplast and nuclear microsatellites. African olive populations from the invaded range exhibit two South African chlorotypes hence supporting an introduction from South Africa, while populations from South Australia exhibit chlorotypes of Mediterranean cultivars. Congruently, nuclear markers support the occurrence of two lineages in Australia but demonstrate that admixture took place, attesting that they hybridized early after introduction. Furthermore, using an approximate Bayesian computation framework, we found strong support for the serial introduction of the African olive from South Africa to NSW and then from NSW to Hawaii. The taxon experienced successive bottlenecks that did not preclude invasion, meaning that rapid decisions need to be taken to avoid naturalization where it has not established a large population yet.

【 授权许可】

CC BY   
© 2013 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd.

Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.