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PhD: Evolution of discrete and continuous morphological characters

Project Title

Evolution of discrete and continuous morphological characters


University of Manchester

Supervisors and Institutions

Dr Robert S. Sansom (University of Manchester), Dr Russell Garwood (University of Manchester), Dr Chris Knight (University of Manchester)

Funding Status

Funding is in competition with other projects and students

Project Description

Advances in the acquisition and analysis of genetic sequence data have led to an increasing emphasis and reliance on molecular data to build phylogenies and test models of evolution, yet phenotypic evidence (morphology) remains vital. Morphology is the only way to incorporate fossil data, and provides a direct link between organisms and their environment. Morphological characters, however, are fundamentally different from molecular characters and lack any defined common model of evolution. This project aims to test models of character evolution using empirical and simulated morphological data and the use of these models in phylogenetics. To achieve this, empirical datasets of modern groups comprising molecular and morphological phylogenetic data will be compiled. Continuous and discrete morphological characters will be applied to molecular trees to test for different models of evolution (i.e. drift, directional selection etc), and the prevalence of character correlation will be assessed. Different approaches to character analysis will be applied and compared in terms of phylogenetic performance and inferred modes of evolution i.e. elimination of correlated characters, continuous characters versus discretized characters. Results from empirical analyses will be compared with simulation data generated using our bespoke software under differing parameters ranging from complete drift to strong natural selection. These combined approaches will enable characterization of modes of morphological evolution, enable probabilistic model-based phylogenetic analyses of morphological data to keep pace with those of molecular data, and ultimately bring morphology from the 19th century into the 21st.

Contact Name

Robert Sansom

Contact Email

Link to More Information

Closing Date

Thursday, January 31, 2019

Expiry Date

Thursday, January 31, 2019
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