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Title: The systematics, phylogeny and conservation assessment for Pterospermum Schreb. (Dombeyoideae/Malvaceae) in Malesia
Author: Ganesan, Santhana Krishnan
ISNI:       0000 0004 6062 5483
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2016
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Pterospermum is a genus of trees that extends from India, Sri Lanka, South China, through South-East Asia to the Moluccas. For the first time, a targeted molecular phylogenetic investigation into the monophyly of Pterospermum was carried out using nuclear (ITS, ETS) and chloroplast (rbcL, trnC-ycf6, trnH-psbA) markers. Pterospermum is shown to be monophyletic and sister to Schoutenia within subfamily Dombeyoideae of Malvaceae. A revision of Pterospermum for the whole of Malesia is presented in this thesis. Twenty-seven species of Pterospermum are recognised, seven of which are new (P. aureum, P. borneense, P. glabrum, P. havilandii, P. merrillianum, P. sarawakense and P. wilkieanum) and one (P. grewiifolium Pierre) is a new distributional record for Malesia. For the first time, conservation assessments for Malesian Pterospermum were carried out using the IUCN 2001 categories and criteria. Of the 27 species assessed, five (17%) were assessed at the regional level (i.e. Malesia) and 23 (83%) species were assessed at the global level. One species, Pterospermum parvifolium, may be extinct in the wild. Three of the species (60%) assessed at the Malesian level are Threatened, while 14 (61%) of the species assessed at the global level are Threatened. P. elmeri, P. glabrum, P. havilandiiP. megalanthum, P. parvifolium (if still extant), and P. subpeltatum are Critically Endangered. The taxonomic information presented in this thesis is a prerequisite for correct species identification, which is essential for the taxonomic end-user in fields such as molecular biology, ecology, forestry and arboriculture. The conservation assessments presented in this thesis highlight Pterospermum species that are threatened in Malesia through deforestation so that measures can be taken to mitigate the risk of extinction.
Supervisor: Not available Sponsor: Singapore Ministry of National Development ; National Parks Board (NParks)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Malvaceae ; Trees ; Deforestation