Occasional hybridization between a native and invasive Senecio species in Australia is unlikely to contribute to invasive success

dc.contributor.author Dormontt, Eleanor E
dc.contributor.author Prentis, Peter J
dc.contributor.author Gardner, Michael George
dc.contributor.author Lowe, Andrew J
dc.date.accessioned 2017-12-06T04:19:05Z
dc.date.available 2017-12-06T04:19:05Z
dc.date.issued 2017-08-15
dc.description This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. en_US
dc.description.abstract Background Hybridization between native and invasive species can facilitate introgression of native genes that increase invasive potential by providing exotic species with pre-adapted genes suitable for new environments. In this study we assessed the outcome of hybridization between native Senecio pinnatifolius var. pinnatifolius A.Rich. (dune ecotype) and invasive Senecio madagascariensis Poir. to investigate the potential for introgression of adaptive genes to have facilitated S. madagascariensis spread in Australia. Methods We used amplified fragment length polymorphisms (141 loci) and nuclear microsatellites (2 loci) to genotype a total of 118 adults and 223 seeds from S. pinnatifolius var.pinnatifolius and S. madagascariensis at one allopatric and two shared sites. We used model based clustering and assignment methods to establish whether hybrid seed set and mature hybrids occur in the field. Results We detected no adult hybrids in any population. Low incidence of hybrid seed set was found at Lennox Head where the contact zone overlapped for 20 m (6% and 22% of total seeds sampled for S. pinnatifolius var. pinnatifolius and S. madagascariensis respectively). One hybrid seed was detected at Ballina where a gap of approximately 150 m was present between species (2% of total seeds sampled for S. madagascariensis). Conclusions We found no evidence of adult hybrid plants at two shared sites. Hybrid seed set from both species was identified at low levels. Based on these findings we conclude that introgression of adaptive genes from S. pinnatifolius var. pinnatifolius is unlikely to have facilitated S. madagascariensis invasions in Australia. Revisitation of one site after two years could find no remaining S. pinnatifolius var. pinnatifolius, suggesting that contact zones between these species are dynamic and that S. pinnatifolius var. pinnatifolius may be at risk of displacement by S. madagascariensis in coastal areas. en_US
dc.identifier.citation Dormontt et al. (2017), Occasional hybridization between a native and invasive Senecio species in Australia is un- likely to contribute to invasive success. PeerJ 5:e3630; DOI 10.7717/peerj.3630 en_US
dc.identifier.doi https://doi.org/10.7717/peerj.3630 en
dc.identifier.issn 2167-8359
dc.identifier.uri http://hdl.handle.net/2328/37714
dc.language.iso en en_US
dc.relation http://purl.org/au-research/grants/arc/DP0664967 en_US
dc.relation.grantnumber ARC/DP0664967 en_US
dc.rights © 2017 Dormontt et al. en_US
dc.rights.holder 2017 Dormontt et al. en_US
dc.rights.license CC-BY
dc.subject Molecular Biology en_US
dc.subject Plant Science en_US
dc.subject Introgression en_US
dc.subject Biological invasions en_US
dc.subject AFLP en_US
dc.subject Microsatellites en_US
dc.subject Fireweed en_US
dc.title Occasional hybridization between a native and invasive Senecio species in Australia is unlikely to contribute to invasive success en_US
dc.type Article en
local.contributor.authorOrcidLookup Gardner, Michael George: https://orcid.org/0000-0002-8629-354X en_US
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