Demographic Inference from Genomic Data

My favorite aspect of population genetics is inference of population history from genetic data. Whether you are thinking about human history or the history of your favorite non-model organism, inferring demographic history is not just interesting for its own sake, but is also a critical step for any study of selection.

I have worked on a variety of demographic inference projects and am particularly interested in comparing different methods and making the subject more accessible to all of us who study non-model organisms.

You can check out our paper that demonstrates that popular methods of demographic inference don’t always predict other summaries of the data, and so shouldn’t be taken too literally, and our review paper detailing different inference methods and their application to non-model organisms. Use our flow chart to find the method that’s right for your data and questions!

[ Note: I am happy to be able to offer complimentary one-time access to my Annual Reviews article as a PDF file, for your own personal use. Any further/multiple distribution, publication, or commercial usage of this copyrighted material requires submission of a permission request addressed to the Copyright Clearance Center ( ]


Otter Genomics

Aquatic adaptation and depleted diversity in the sea otter and giant otter genomes.

I have sequenced, assembled and annotated the de novo southern sea otter genome, and annotated the giant otter genome that was assembled by the Broad Institute. We are comparing these two highly divergent otter species to understand the genetic changes that underlie their recent aquatic adaptation and to get a first look at the potential impacts of the extreme fur trade bottleneck on the sea otter’s genome.

Stay tuned for more discussion of our results soon!


Guide to demographic inference in non-model organisms

Have you ever wanted to infer the population history of your study species, had genomic data, but not known where to start? Check out our review of popular demographic inference techniques and their application to non-model organisms! We describe each method’s theoretical underpinnings, how each has been applied to non-model organisms, and explain some important caveats. My favorite part is the flow-chart I made to help guide researchers to different techniques that will work for their data and questions.

Demographic inference is my favorite part of population genetics, and I hope this helps it feel doable!

You can access the paper here with complimentary one-time access, for your own personal use. (Any further/multiple distribution, publication, or commercial usage of this copyrighted material requires submission of a permission request addressed to the Copyright Clearance Center (

Monterey Bay Aquarium Blog Post

A blog post I wrote about the sea otter genome project has been featured on the Monterey Bay Aquarium Blog! I had a great time working on the post with Ken Peterson, the Aquarium’s Communications Director, and absolutely love the sweet infographic on the bottleneck designed by Tiffany Enriquez (courtesy of the Monterey Bay Aquarium).




SMM 2015 (continued)

It’s been an incredible few days here in San Francisco — meeting marine mammal researchers from around the globe and hearing talks on wide-ranging topics, some familiar and some very new.

I’ve learned there’s a “whale temple” in Thailand where fishermen bring the remains of stranded cetaceans for worship (Long Vu, Vietnam Marine Mammal Network).

We’ve heard experts discuss climate change’s effects on the Jet Stream (Jennifer Francis, Rutgers University) and the implications for marine mammal populations (Dr. Sue Moore, NOAA).

There was an entire session dedicated to sea otter research led by Dr. Tim Tinker (UCSC) and Dr. Jim Estes (UCSC), with presentations on a huge array of topics including diving behaviors (Joseph Tomoleoni, USGS), variance in reproductive success (Max Tarjan, UCSC), tactile sensing abilities (Sarah Macay Strobel, USGS/UCSC), and more!

I’ve learned about the genetics of scent in fur seals (Martin Stoffel, Bielefeld University) and the difficulties of SNP detection in the fur seal draft genome (Emily Humble, Bielefeld University).

I’ve had fantastic talks with otter researchers about the uses of isotopes from ancient otter bones for understanding changes in diet over time (Emma Elliott Smith, UNM) and gotten amazing advice about how to use ancient otter samples in my own genomic research (Dr. Shawn Larson, Seattle Aquarium).

My own talk on the whale gut microbiome was a blast — I got insightful questions and talked to interested researchers extensively afterward. Tomorrow, I’m looking forward to a last wander through the posters, more genetics talks, and a big Society for Marine Mammalogy “Birthday Bash” at SF City Hall!