Evolution of insular pacific Pittosporum (Pittosporaceae)

Origin of the hawaiian radiation

C. E C Gemmill, Gerard J Allan, W. L. Wagner, E. A. Zimmer

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

We investigated the origin of Hawaiian Pittosporum and their relationship to other South Pacific Pittosporum species using internal transcribed spacer sequences of nuclear ribosomal DNA. We performed both maximum-parsimony and maximum-likelihood analyses, which produced congruent results. Sequence divergence was 0.0% between Hawaiian members of Pittosporum. These taxa formed a strongly supported clade, suggesting a single colonization event followed by phyletic radiation. Sister to the Hawaiian clade were two South Pacific species, P. yunckeri from Tonga and P. rhytidocarpum from Fiji. This result presents convincing evidence for a South Pacific origin of Hawaiian Pittosporum. Our results also identify a monophyletic group comprising three species representing the Fijian Province and East Polynesia, two introductions onto New Caledonia, and at least one (but possibly two) introduction(s) onto New Zealand. Whether the New Zealand taxa form a monophyletic group is unclear from these data. Previous morphologically based hypotheses, however, suggest the presence of four different lineages occupying New Zealand. The nonmonophyly of the New Caledonian species was not surprising based on the extent of their morphological diversity. Although this latter result is not strongly supported, these species are morphologically complex and are currently the subject of taxonomic revision and molecular systematic analyses.

Original languageEnglish (US)
Pages (from-to)31-42
Number of pages12
JournalMolecular Phylogenetics and Evolution
Volume22
Issue number1
DOIs
StatePublished - 2002
Externally publishedYes

Fingerprint

Rosales
Pittosporaceae
Pittosporum
New Zealand
Radiation
Tonga
New Caledonia
Fiji
Polynesia
molecular systematics
taxonomic revisions
Ribosomal DNA
ribosomal DNA
internal transcribed spacers
new taxon
Caledonian orogeny
colonization
divergence
radiation
new species

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics

Cite this

Evolution of insular pacific Pittosporum (Pittosporaceae) : Origin of the hawaiian radiation. / Gemmill, C. E C; Allan, Gerard J; Wagner, W. L.; Zimmer, E. A.

In: Molecular Phylogenetics and Evolution, Vol. 22, No. 1, 2002, p. 31-42.

Research output: Contribution to journalArticle

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