Department of Biological Sciences
University of Pittsburgh
Pittsburgh PA 15260-3929
‹TEL: lab: 412-624-0985
office: 412-624-0984

​‹MAIL: tia1 'at'

The Ashman Lab 
We study plant evolutionary ecology:
Species interactions & genomic contributors to
plant adaptation & biodiversity
Anne Sternberg to join lab in May to work with Tia-Lynn and Aaron Liston on sex chromosome evolution.

The lab published a fantastic pair of polyploidy papers:

Wei, N. Z. Du, A. Liston and T-L. Ashman. Genetic lineage-dependent genome duplication effects on functional traits and fitness in synthetic polyploid Fragaria. American Journal of Botany 107(1): 1–11

Forrester, N.J. and T-L Ashman. Synthetic autotetraploids show that polyploidy alters the mutualism interface of legume-rhizobia interactions in Medicago sativa subsp. caerulea. American Journal of Botany

Tia-Lynn & Aaron Liston receive funding to understand sex chromosome evolution
Sergio Ramos to join lab as PEEP fellow working on eco-evo feedbacks and rapid evolution with Tia-Lynn and Martin Turcotte.
Gradstudent Nevin Cullen receives Sigma Xi funds to support his research into floral microbiome of Streptanthus species!
HMB student Veronica Iriart joins lab as graduate student studying herbicide drift effect on plant communities, the Ashman lab is excited to have you Vero! 
Andrea receives Mellon Fellowship!
Avery and Tia-Lynn publish on pollinator learning of flower microbes !
Members of the Ashman and Hatfull labs identify novel phages in microbes from flowers
Na & Nikki publish papers on plasticity in polyploids and mutualism in the city!
International consortium of pollination biologists lead by Tia-Lynn & Tiffany Knight publish the world's largest data set on pollen limitation in Nature Scientific Data!
Our paper on JUMPING SEX GENES in strawberry is published in PLOS Biology and featured in Science and on #TWiEVO podcasts
Undergrads Abby & Nick are awarded PASG grants to conduct their research!
The Ashman lab welcomes Nevin Cullen and Veronica Iriart as new graduate students!
We received funding to collaborate with Gina Baucom on the eco-evolutionary dynamics of pesticide use. 
Important insights into pollen transfer networks & effects of heterospecific pollen receipt published in two papers AJB with Gerardo, Victor, Conchita and Inam, and one in New Phytologist with Anna!
Paper on polyploidy and range published with Matt & former undergrad Hailey!
Andrea receives funding from PLE, BSA and PAS to study plant-pollinator-virus interactions!
Na's paper showing sexual dimorphism in wild strawberry microbiomes is published!
Nikki receives funding from ASN ad SSE to pursue the effects of  polyploidy on rhizobia-plant interactions!
Our discovery of intraspecific variation in sex chromosomes of the Virginian strawberry is published in JOH!
Nikki's paper on the direct effects of polyploidy on Legume-rhizobial mutualism is published in AOB!
Tia-Lynn & Jim Pipas receive funding from The Charles E Kaufman Foundation to study the pollen virome!
Anna, Andrea and Tia-Lynn publish a New Phytologist view point paper on the unintended consequences of pollinator gardens for native urban biodiversity. 
Na and Tia-Lynn (with collaborators Jacob Tennessen and Aaron Liston) publish New Phytologist paper on the evolution of a decaploid!
Dr. Jess D. Stephens joins the lab.
Nikki receives PEP ESA travel award.
Andrea receives PA Academy of Science Research Award.
Maria wins spot in EDANAME workshop & ASN young scientist symposium.
PEEP fellows Dr. Maria Rebolleda-Gomez and Dr. Avery Russell join the lab to expand studies of microbes, plants, and bee behavior to new frontiers.
Dr. Du arrives from Taizhu University as a visiting scholar to study the physiological effects of polyploidy.
Tia-Lynn is receives a Helmholtz International Fellow Award for research in Germany

Tia-Lynn is promoted to Distinguished Professor

Anna and Tia-Lynn receive funding from MSCI to study Pollination in the city: Designing urban pollinator gardens that are resilient to air pollution.

Gerardo's paper 'Invasion status and phylogenetic relatedness predict cost of heterospecific pollen receipt: implications for native biodiversity decline' published in Journal of Ecology!

Sex chromosome work published in New Phytologist--Homomorphic ZW chromosomes in a wild strawberry show distinctive recombination heterogeneity but a small sex-determining region.

Nikki is awarded EDEN and MICROMORPH grants to study plant-rhizobial interactions. Awesome!


Nikki is awarded Rosemary Grant Graduate Student Research Award from the Society for the Study of Evolution. AWESOME!


Anna Johnson is awarded a 2015 NSF Postdoc Fellowship to work with us to study how species compositional shifts over 100 years affect Hawaiian pollen transport networks!  We are truly thrilled!!


Nikki receives coveted NSF Predoctoral Fellowship! Congratulations!!

And former undergrad Bella Salamone receives Honorable mention!


Matt's work on Flower color featured in Scientific American! See it here:


Raj's paper on discordance among genomes in the octoploid clade of Fragaria published in AJB!  See it here:


Matt Koski's paper on "Floral pigmentaion patterns provide an example of Gloger's rule in plants" has been published in Nature Plants. Congratulations Matt!


Paper exploring the octoploid genome published in Genome Biol. Evol. !



Postdoctoral position in

Polyploidy & Species interactions

Postdoctoral position the ecological effects of plant polyploidy on species interactions in the lab of Dr. Tia-Lynn Ashman and in collaboration with Dr. Martin Turcotte.

The postdoc will assess consequences of plant polyploidy on biotic interactions in two model plant systems.  The focus will be on the effects of polyploidy on interactions with microbes, pollinators, and/or herbivores, as well as competitive interactions between plants.

Responsibilities include setting up experimental populations, collection and analysis of data on species interactions, including community composition and interaction networks, and characterizing fitness effects, and the preparation of manuscripts for publication. 


Position affords opportunities for undergraduate mentoring, scientific outreach, and the design and implementation of allied projects tailored to the skills and interests of the postdoc.


An ideal candidate has the following characteristics: 1) is evolutionary-minded, creative and a collaborative spirit, 2) background in community ecology, population biology or microbial or plant biology,  3) experience with insect identification, techniques for characterizing microbial communities and/or willingness to expand expertise, 4) strong statistical and writing skills.


Position is for two years and will be based in the Department of Biological Sciences at the University of Pittsburgh, Pittsburgh, PA. Start date is negotiable, but expected Spring/summer 2020.


TO APPLY: Please send a CV and a cover letter describing your experience and interests to along with the names and contact information for three referees. Review of applications will commence immediately and continue until filled.

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