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Abstract Detail



Systematics Section/ASPT

Ranarivelo, Heritiana [1].

Investigating species hypotheses for the Malagasy clade of the genus Psorospermum (Hypericaceae).

I investigated species hypotheses for Psorospermum species in Madagascar by integrating morphological species hypotheses and clustering of sequences in molecular phylogenetic data. Both chloroplast gene ndhF and nuclear gene ITS phylogenies shows the Malagasy Psorospermum to be monophyletic and with two well supported clades (Clade I and Clade II). Using multivariate analysis based on Gaussian mixture models implemented in Mclust R packages, I investigated the morphogroups within each clade and compared them with the molecular clusters; individuals for each taxon tip of the clades were measured for floral and vegetative characters. Mclust analyses found support for 8 morphological clusters in Clade I and 2 morphological clusters in Clade II. Morphology and molecular results match in Clade II but not in Clade I. Further samples will be added to both molecular and morphological analyses and other characters from embryo and anatomy will be investigated to clarify species boundaries.


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1 - University of Missouri St Louis, Biology, 1 University Blvd., St Louis, MO, 63121, USA

Keywords:
Psorospermum
Hypericaceae
Species delimitation
Madagascar
Phylogeny
Morphometrics.

Presentation Type: Oral Paper:Papers for Sections
Session: 19
Location: Salon 9/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 1:30 PM
Number: 19001
Abstract ID:939
Candidate for Awards:None


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