Postdoctoral Researchers

Jaime Ashander’s research focuses on developing theory on population dynamics resulting from evolutionary and plastic responses to changing environments. He is also developing methods for connecting this theory to data. As a Postdoctoral Scholar in the Shaffer lab at UCLA, Jamie is working to develop methods for genome-enabled conservation biology. With funding from the U.S. Fish and Wildlife Service, and in collaboration with Brad, Evan McCartney Melstad, and Peter Ralph (now at University of Oregon), he is developing a genomically-informed demographic model of the desert tortoise (Gopherus agassizii). This model will enable analysis of how the population viability of the tortoise varies under a variety of scenarios for development in the Mojave desert.

Gary Bucciarelli is broadly interested in stream ecology, conservation genetics, the evolution of chemical defenses, and ecological processes occurring at the urban-wildlife interface. His current research investigates the evolution and ecology of the neurotoxin tetrodotoxin in the genus of newts, Taricha, which are found throughout California. He is also working with the La Kretz Center for California Conservation Science and the National Park Service to develop a broad conservation management plan for amphibians of Los Angeles. For more  information visit Gary’s website at

Jesse Grismer is interested in how adaptation to a particular type of habitat or microhabitat influences the diversification of eco-morphologies within lizards. This interest formed the basis for his dissertation research at the University of Kansas. In the Shaffer Lab, Jesse is collaborating on our U.S. Fish & Wildlife Service grant to use genomic tools to help determine if the Southern Californian Rubber Boa and the Lesser Slender Salamander require listing as endangered species. He earned his Ph.D. at the University of Kansas in 2016, and is currently a postdoctoral researcher at Auburn University. Jesse joined the Shaffer Lab in November, and will be splitting his time between Auburn and UCLA. For more information, download Jesse’s cv

Evan McCartney-Melstad uses genomic datasets and tools to answer questions in ecology and conservation that are difficult to address by other means. He is particularly interested in investigating how landscapes and seascapes structure and influence animal populations and the resulting implications for conservation. Evan’s research involves gathering and analyzing genomic datasets to answer: 1) How energy developments affect the federally protected Mojave desert tortoise and 2) What are the driving factors behind the hybridization of the invasive barred tiger salamander with the endangered California tiger salamander. In addition to these empirical systems, he is working to make genomic technologies and bioinformatics analyses more applicable to large genome amphibians.

Peter Scott is an evolutionary biologist and herpetologist interested in explaining mechanisms responsible for lineage diversification and persistence. Always having a love for amphibians and reptiles, he finds it both rewarding and natural to find appropriate systems in herpetology in which to base my research. His work in the Shaffer lab investigates the utility of different genomic sequencing methods (RADseq, exon capture, whole genome) for resolving difficult nodes in the Tree of Life and will practically attempt to infer species limits and relationships with Pseudemys turtles. Previously he has worked on understanding systematics, species limits, hybrid zone dynamics, population and conservation genetics, and population ecology or North American turtles in the genus Sternotherus and phylogeography and systematics of whiptail lizards in Baja California, Mexico.

Ben Wielstra is a Marie Skłodowska-Curie Fellow hosted by the Shaffer Lab during the outgoing phase of his fellowship, and by Roger Butlin at the University of Sheffield during the return phase.  Ben is interested in the evolutionary history of closely related species – how such species originated and obtained their current distribution and how they interact during the course of their evolution, as ecological divergence drives them apart and gene flow pulls them together. His research combines phylogeographical and spatial ecological methods to retrace the distribution of species and spatial contact between them. As a model system he mainly uses salamanders. For more information, visit Ben’s website