Journal Article Research Support, Non-U.S. Gov't Paleogene Paleógeno Review abiotic and biotic constraints assembly of present and fossil communities biodiversity conservation community assembly competition conservación de la biodiversidad conservation biology declinación de los tipos de hábitat decline of habitat types disturbance and stress diversificación filogenética específica de la época enemy pressure and mutualism of coexisting species epoch-specific phylogenetic diversification evolution and conservatism functional diversity hybridization inferencia paleoecológica limitaciones bióticas y abióticas niche breadth niche conservatism paleoecological inference phylogenetic diversity phylogenetic signal species-pool trait evolution