Confirmation of Candidature presentation: Molecular systematics of Rhodophyta in the Wallacea Region

Confirmation of Candidature presentation: Molecular systematics of Rhodophyta in the Wallacea Region

Fri, 08/11/2013 - 11:00

About the Presenter

Abdul Razaq Chasani

Abdul Razaq Chasani graduated in a Master of Biotechnology in 2007, at Graduate School of Universitas Gadjah Mada in Yogyakarta, Indonesia.

Razaq started his current PhD in 2012. He works on molecular systematics of Rhodophyta in the Wallacea region: phylogenetics and phylogeography of Gracilaria salicornia (C. Agardh) E.Y. Dawson & Hypnea pannosa J. Agardh.


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Molecular systematics of Rhodophyta in the Wallacea Region:  Phylogenetics and Phylogeography of Gracilia salicornia (C. Agardh) E.Y. Dawson and Hypnea pannosa J. Agardh

Investigations on macroalgal phylogenies using genetic data are common but relatively few studies have focused on the molecular systematics of widespread, tropical Indo-Pacific macroalgae, particularly in the biogeographically complex Wallacea Region.

As the most recognized biogeographical boundary in the Wallacea Region, Wallace’s Line demarcates the most abrupt faunal transition in the world. The collision of two continental shelves (i.e. Sundaland and Australia) at the beginning of Miocene caused the closure of the narrow and deep marine gap, forming the geological basis for Wallace’s Line as oceanic geographical barrier.

Although Wallace’s Line is potentially present as a dispersal barrier for some marine taxa, there is no significant data of vicariant isolation in marine organism by this oceanic barrier. Using molecular techniques, this PhD proposal will explore the molecular systematics of two common, widespread and economically important tropical red macroalgae (Rhodophyta) of the Wallacea Region: Gracilaria salicornia (C. Agardh) E.Y. Dawson and Hypnea pannosa J. Agardh in relation to the Wallacea Region and specifically, Wallace’s Line.

The effect of this oceanic barrier on the phylogenetics and phylogeography of these species will be studied using DNA sequence analyses based on appropriate marker(s) datasets of individuals from 8 localities in that region. DNA extraction, PCR amplification and DNA sequencing will be done using standard procedures. Statistical analyses using appropriate software will be done to calculate and test population genetic parameters. Phylogenetic analyses and tree reconstruction will be performed and the presence of statistically significant correlation between spatial and genetic structure will be explored.

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