Research
Bridging Micro and Macroevolution from an Organismic Perspective
The study of evolution has been classically divided into two fields: micro and macroevolution. While microevolution is concerned with evolutionary change that takes place within ecological and historical periods, macroevolution is the study of changes that happened throughout millions of years, at the paleontological time-scale. Classically, these fields have been seem as somehow irreconcilable, as the models describing short-period changes cannot account for the complexities over longer periods of time. Results from our lab, however, show that the macroevolution of some biological systems follow very closely the predictions of microevolutionary models, opening the door for the incorporation of more biologically realistic assumptions in the study of macroevolution and paleontology.
Evolution of the Mammalian Skull
The vertebrate skull is a complex system containing multiple individualized units
(bones) formed along ontogeny by a complex interaction of numerous biological processes.
The skull also has many organs and structures that perform various functions, such
as perception, cognition, food processing and etc, making it a target of intense,
and sometimes conflicting, selective pressures. We use the mammalian skull as a model
to understand how selection can shape a complex structure. We integrate phylogenetic
comparative methods, quantitative genetics theory and ecological information to investigate
how the skull evolves and what internal and external factors might shape its diversification.
Morphological Integration
Variation is the fuel of evolution. Understanding how variation is generated and structured
in complex traits can provide critical insights into species' capacity to adapt over
time. Biological traits can also covary to different degrees, leading to patterns
of variational modularity and integration, which can constraint or facilitate evolution.
We employ high-dimensional morphometric techniques to describe patterns of trait variation
within single species, but more importantly, compare multiple species to evaluate
how these patterns are themselves evolving.
Method Development
We develop and implement methods to analyze morphological variation and evolution at various scales. We are currently developing methods for the microevolutionary analysis of complex traits and implementing new methods for studying multivariate macroevolution and modularity.
Below are some of our contributions:
- EMORPH2—Tools for Evolutionary Morphology and Morphometrics
- PCMKappa—Phylogenetic comparative kappa models
- EVOLQG—Tools for Evolutionary Quantitative Genetics
Taxonomy and Systematics
The basic unit of macroevolutionary studies is the species. Despite many centuries of documentation, we still know only a fraction of all species that exist. Recent studies have shown that even the diversity of large charismatic mammals can be underestimated. Our work focuses on describing new species from an integrative perspective, both molecular and morphological.
