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UID:1534@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20170123T110000
DTEND;TZID=Europe/Paris:20170123T120000
DTSTAMP:20170108T100000Z
URL:https://www.i2m.univ-amu.fr/evenements/time-dependent-asymmetric-linea
 r-parsimonious-ancestral-state-reconstruction/
SUMMARY: (...): Time-dependent-asymmetric-linear-parsimonious ancestral sta
 te reconstruction
DESCRIPTION:: The time-dependent-asymmetric-linear parsimony is an ancestra
 l state reconstruction method which extends the standard linear parsimony 
 (a.k.a. Wagner parsimony) approach by taking into account both branch leng
 ths and asymmetric evolutionary costs for reconstructing quantitative char
 acters (asymmetric costs amount to assuming an evolutionary trend toward t
 he direction with the lowest cost).A formal study of the influence of the 
 asymmetry parameter shows that the time-dependent-asymmetric-linear parsim
 ony infers states which are all taken among the known states\, except for 
 some degenerate cases corresponding to special values of the asymmetry par
 ameter. This remarkable property holds in particular for the Wagner parsim
 ony.This study leads to a polynomial algorithm which determines\, and prov
 ides a compact representation of\, the parametric reconstruction of a phyl
 ogenetic tree\, that is for all the unknown nodes\, the set of all the pos
 sible reconstructed states associated to the asymmetry parameters leading 
 to them. The time-dependent-asymmetric-linear parsimony is finally illustr
 ated with the parametric reconstruction of the body size of cetaceans.Webp
 age
CATEGORIES:Séminaire,Mathématiques-Évolution-Biologie
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DTSTART:20161030T020000
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