The potential implications of rainforest history, hybridization, and climate change on the phylogenetics of a rare genus of herbs Romnalda (Dasypogonaceae) from New Guinea and Australia

Alison Shapcott; B Bau; P Katik

doi:10.1111/j.1095-8339.2008.00782.x

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The potential implications of rainforest history, hybridization, and climate change on the phylogenetics of a rare genus of herbs Romnalda (Dasypogonaceae) from New Guinea and Australia

Journal article

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The potential implications of rainforest history, hybridization, and climate change on the phylogenetics of a rare genus of herbs Romnalda (Dasypogonaceae) from New Guinea and Australia

Alison Shapcott, B Bau and P Katik

Botanical Journal of the Linnean Society, Vol.157(3), pp.455-474

2008

DOI: https://doi.org/10.1111/j.1095-8339.2008.00782.x

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Abstract

genetic diversity

inbreeding

phenology

rarity

reproduction

speciation

There are many genera shared between Australian and Papua New Guinean rainforests. Species in the rare rainforest herbaceous genus Romnalda have a relictual and disjunct distribution within the major rainforest blocs of southern Queensland, north Queensland, and New Guinea. There are only four species in this genus: R. strobilacea, R. grallata, and R. sp.'Cooper Ck' from Australia, and R. papuana from New Guinea. The Australian species have restricted distributions and high conservation status. Allozymes were used to study the genetic variation and distinctiveness of all four species. Genetic diversity varied significantly amongst the four species. The species in the centre of the genus distribution contained the highest genetic diversity, regardless of rarity. The undescribed R. sp.'Cooper Ck' was identified as a clearly distinct species with morphological affinities to R. papuana, but genetic affinities to R. grallata. The study showed that, where the distributions of R. grallata and R. sp.'Cooper Ck' overlapped, there was evidence of hybridization. Reproductive participation within populations was typically low with limited flowering synchrony. Populations of all four species were inbred, but higher levels of inbreeding were not correlated with lower genetic diversity. The timing of flowering appeared to be determined by climate. Altitudinal variation in phenological timing in R. sp.'Cooper Ck' has led to genetic isolation within the species, but has also limited its genetic introgression with the co-occurring R. grallata.

Details

Title: The potential implications of rainforest history, hybridization, and climate change on the phylogenetics of a rare genus of herbs Romnalda (Dasypogonaceae) from New Guinea and Australia
Authors: Alison Shapcott (Author) - University of the Sunshine Coast - Faculty of Science, Health and Education
B Bau (Author) - PNG Forest Research Institute, Papua New Guinea
P Katik (Author) - PNG Forest Research Institute, Papua New Guinea
Publication details: Botanical Journal of the Linnean Society, Vol.157(3), pp.455-474
Publisher: Wiley-Blackwell Publishing Ltd.
Date published: 2008
DOI: 10.1111/j.1095-8339.2008.00782.x
ISSN: 0024-4074
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering; Centre for Bioinnovation
Language: English
Record Identifier: 99449878802621
Output Type: Journal article

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