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Title: Statistical modeling for adaptive trait evolution in randomly evolving environment Authors:  Dwueng-Chwuan Jhwueng - Feng-Chia University (Taiwan) [presenting]
Abstract: In past decades, Gaussian processes has been widely applied in studying trait evolution using phylogenetic comparative analysis. In particular, two members of Gaussian processes: Brownian motion(BM) and Ornstein-Uhlenbeck(OU) process, have been frequently used to describe continuous trait evolution. Under the assumption of adaptive evolution, several models have been created around OU process where the optimum of a single trait is influenced with predictor. Since in general the dynamics of rate of evolution of trait could adopt a pertinent process, we extend models of adaptive evolution by considering the rate of evolution following the Cox-Ingersoll-Ross(CIR) process. We provide a heuristic Monte Carlo simulation scheme to simulate trait along the phylogeny as a structure of dependence among specie. We add a framework to incorporate multiple regression with interaction between optimum of the trait and its potential predictors. Since the likelihood function of our models are intractable, we propose the use of Approximate Bayesian Computation(ABC) for parameter estimation and inference. Simulation as well as empirical study using the proposed models are also performed and carried out to validate our models and for practical application.