Andrea Schreier

Andrea Schreier's photo

Position Title
Adjunct Assistant Professor

Department of Animal Science, College of Agricultural and Environmental Sciences

2235 Meyer Hall, Davis, CA 95616

Research Interests

Genetic tools to improve management/conservation of fish and wildlife species

My group uses genetic and genomic tools to answer questions that directly influence the management and conservation of North American fish and wildlife species.  We are particularly interested in the conservation of native California fishes such as delta smelt, sturgeon, and salmonids although we also study invertebrates, amphibians, reptiles, and mammals. We have one project focusing on an endangered plant. Much of this research is conducted collaboratively with state, tribal, or federal agency biologists, providing students with opportunities to work directly with conservation practitioners.

Improving conservation and commercial aquaculture to protect wild populations

Aquaculture can be used to sustain endangered fish populations directly through release of captive reared fish into the wild (conservation aquaculture) or indirectly by providing an alternative source of fish protein to meet human demand (commercial aquaculture). My group applies genetics/genomics to improve the management of captive fish populations for conservation and commercial aquaculture.  We conduct ongoing genetic monitoring of captive breeding programs for delta smelt and white sturgeon. We also are studying the costs and benefits of spontaneous autopolyploidy to the white sturgeon commercial aquaculture industry.

Autopolyploidy in Acipenseriform fishes

Acipenseriform fishes (sturgeon and paddlefishes) are ancient polyploids that can spontaneously triploidize in aquaculture. Spontaneous autopolyploid white sturgeon are fertile and produce viable offspring when crossed with normal conspecifics.  We know that the additional genome copy is from retention of the second polar body during meiosis but its not clear what is causing some females to produce large numbers of triploid offspring in captivity while spontaneous autopolyploidy in the wild is rare. We are conducting experiments to determine what factors are responsible for high rates of second polar body retention as well as evaluating how genome duplication affects sexual development of spontaneous autopolyploids and their offspring. We are also interested in using families containing even ratios of normal and spontaneous autopolyploid offspring to determine how an incipient polyploidization event affects genome structure and function.

Environmental DNA Applications

Environmental DNA (eDNA), or DNA extracted from environmental samples such as water, sediment, or soil, can be used to measure biodiversity (metabarcoding) and detect rare or cryptic species in the wild. We are collaborating with several resource management agencies to use eDNA to improve monitoring of rare species and invasive species and evaluate biodiversity in the San Francisco Estuary.

Grad Group Affiliations

  • Ecology Graduate Group
  • Integrative Genetics and Genomics

Specialties / Focus

  • Ecological and Wildlife Genetics
  • Quantitative and Population Genetics


  • ECL 200A, Winter (I teach the population genetics and microevolution module of the Ecology Graduate Group core course)
  • ECL 290 Writing Science for Ecologists, Fall (odd years)
  • ANG 185 The Science of Captive Breeding and Reintroduction, Spring

Honors and Awards

  • Robert L. Kendall Award (Best paper in Transactions of the American Fisheries Society in 2013)

    Professional Societies

    • American Fisheries Society
    • North American Sturgeon and Paddlefish Society (Governing Board member, Vice President)
    • World Sturgeon Conservation Society
    • IUCN Sturgeon Specialist Group


    • 2012 PhD Ecology, University of California Davis
    • 2006 MS Wildlife Genetics, Purdue University
    • 2003 BS Biology, Chemistry Minor, Hillsdale College


    See our projects page for a more detailed description of our current projects and our publications page for a list of the lab's recent publications.