Topological properties of phylogenetic trees in evolutionary models |
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Authors: | M Stich and S C Manrubia |
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Institution: | (1) Centro de Astrobiología (CSIC-INTA), Ctra. de Ajalvir km. 4, 28850 Torrejón de Ardoz, Madrid, Spain |
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Abstract: | The extent to which evolutionary processes affect the shape
of phylogenetic trees is an important open question. Analyses of
small trees seem to detect non-trivial asymmetries which are usually
ascribed to the presence of correlations in speciation rates. Many
models used to construct phylogenetic trees have an algorithmic
nature and are rarely biologically grounded. In this article, we
analyze the topological properties of phylogenetic trees generated
by different evolutionary models (populations of RNA sequences and a
simple model with inheritance and mutation) and compare them with
the trees produced by known uncorrelated models as the backward
coalescent, paying special attention to large trees. Our results
demonstrate that evolutionary parameters as mutation rate or
selection pressure have a weak influence on the scaling behavior of
the trees, while the size of phylogenies strongly affects measured
scaling exponents. Within statistical errors, the topological
properties of phylogenies generated by evolutionary models are
compatible with those measured in balanced, uncorrelated trees. |
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Keywords: | PACS" target="_blank">PACS 87 23 Kg Dynamics of evolution 89 75 Hc Networks and genealogical trees |
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