Genome scans reveal high levels of gene flow in Hawaiian Pittosporum

Christine D. Bacon, Gerard J Allan, Elizabeth A. Zimmer, Warren L. Wagner

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Species radiations in the Hawaiian Islands have resulted in closely related yet morphologically and often ecologically distinct species, many of which have highly restricted distributions. Eleven species of Pittosporum (Pittosporaceae) are recognized in the Hawaiian Islands, yet it remains unclear whether the morphological variation within Hawaiian Pittosporum is due to hybridization, genetic polymorphism, phenotypic plasticity, or some combination of these processes. In this study of Hawaiian Pittosporum we used a genome-wide approach employing 626 Amplified Fragment Length Polymorphisms (AFLPs) to test species boundaries and elucidate gene flow within and among species. Parsimony trees were constructed to identify clades of individuals that correspond to species, island affinity, and/or sexual system. Network analysis was used to identify the number of lineages in the dataset; results showed a lack of resolution due to reticulation. Based on Bayesian assignment tests, Hawaiian Pittosporum exhibited high levels of gene flow. The interspecific allelic exchange and reticulation caused non-hierarchical relationships between species and a lack of reproductive isolation rendered species boundaries permeable. This study highlights the impact of hybridization on species persistence and conservation as well as on general patterns of Hawaiian biota.

Original languageEnglish (US)
Pages (from-to)733-741
Number of pages9
JournalTaxon
Volume60
Issue number3
StatePublished - Jun 2011

Fingerprint

Pittosporum
gene flow
genome
Hawaii
Pittosporaceae
hybridization
sexual systems
reproductive isolation
phenotypic plasticity
amplified fragment length polymorphism
testing
genetic polymorphism
polymorphism
organisms
network analysis
biota
persistence

Keywords

  • AFLP
  • Gene flow
  • Hawaiian Islands
  • Hybridization
  • Pittosporum

ASJC Scopus subject areas

  • Plant Science
  • Ecology, Evolution, Behavior and Systematics

Cite this

Bacon, C. D., Allan, G. J., Zimmer, E. A., & Wagner, W. L. (2011). Genome scans reveal high levels of gene flow in Hawaiian Pittosporum. Taxon, 60(3), 733-741.

Genome scans reveal high levels of gene flow in Hawaiian Pittosporum. / Bacon, Christine D.; Allan, Gerard J; Zimmer, Elizabeth A.; Wagner, Warren L.

In: Taxon, Vol. 60, No. 3, 06.2011, p. 733-741.

Research output: Contribution to journalArticle

Bacon, CD, Allan, GJ, Zimmer, EA & Wagner, WL 2011, 'Genome scans reveal high levels of gene flow in Hawaiian Pittosporum', Taxon, vol. 60, no. 3, pp. 733-741.
Bacon CD, Allan GJ, Zimmer EA, Wagner WL. Genome scans reveal high levels of gene flow in Hawaiian Pittosporum. Taxon. 2011 Jun;60(3):733-741.
Bacon, Christine D. ; Allan, Gerard J ; Zimmer, Elizabeth A. ; Wagner, Warren L. / Genome scans reveal high levels of gene flow in Hawaiian Pittosporum. In: Taxon. 2011 ; Vol. 60, No. 3. pp. 733-741.
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