Compara mètodes

	Reconstrucció de l'Estat Ancestral	Contrastos Filogenètics Independents
Camp	Genètica	Genètica
Família	Process / pipeline	Process / pipeline
Any d'origen	1991	1985
Autor original	Wayne Maddison	Joseph Felsenstein
Tipus	Inference method	Statistical comparative method
Font seminal	Maddison, W. P. (1991). Squared-change parsimony reconstructions of ancestral states for continuous-valued characters on a phylogenetic tree. Systematic Zoology, 40(3), 308–314.	Felsenstein, J. (1985). Phylogenies and the comparative method. American Naturalist, 125(1), 1–15.
Àlies	ASR, Ancestral character reconstruction, Trait reconstruction	PIC, Contrasts method, Felsenstein's contrasts
Relacionats	3	3
Resum	Ancestral state reconstruction (ASR) is a phylogenetic method that infers the character states (trait values or evolutionary features) of extinct ancestors by analyzing patterns of variation in extant (living) species. Developed by Wayne Maddison and colleagues in the 1990s, ASR uses the phylogenetic tree and observed trait variation in living species to estimate what ancestors possessed, enabling researchers to trace the evolutionary history of morphological, behavioral, ecological, and genomic traits.	Phylogenetic Independent Contrasts (PIC) is a comparative statistical method that tests for associations between traits across species while accounting for shared evolutionary history. Developed by Joseph Felsenstein in 1985, PIC solves a fundamental problem in comparative biology: related species share traits due to common ancestry, not independent evolution, which violates the statistical assumption of independence. By comparing trait differences between sister species pairs, PIC removes the confounding effects of phylogenetic relatedness and enables robust evolutionary inferences.