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Department of Evolutionary Biology and Environmental Studies

Fletcher Halliday

Research interests

I am broadly interested in how anthropogenic drivers alter the abundance and diversity of parasites. We live in an era of rapid global environmental change, biodiversity loss, species introductions, and emerging infectious diseases. Understanding relationships among these processes is critical for limiting their impacts on food production, ecological resilience, and human wellbeing. Yet, doing so is complicated by the fact that these processes occur across spatial and temporal scales. I take a complementary approach to address this challenge, using experiments, large-scale field surveys, and data syntheses across a variety of study systems, so that we can better understand and predict infectious disease risk in our changing world.


Education and professional positions

2022 – 2026 SNSF Ambizione fellow, Department of Evolutionary Biology and Environmental Studies, University of Zürich, Switzerland
2019 – 2022 Postdoctoral Researcher, Department of Evolutionary Biology and Environmental Studies, University of Zürich, Switzerland
2018 – 2019 Postdoctoral Researcher, Integrative Biology Department, University of South Florida, FL, USA
2018 Postdoctoral Researcher, Biology Department, University of North Carolina, NC, USA
2017 Ph.D. Biology, University of North Carolina, Chapel Hill, NC, USA
2008 – 2010 Biologist, URS Corporation, Environmental Sciences Division, Oakland, CA, USA
2008 B.Sc. Molecular Environmental Biology, University of California, Berkeley, CA, USA

Selected publications

  • Halliday FW*., Jalo M*., Laine A-L. (2021). The effect of host community functional traits on plant disease risk varies along an elevational gradient. eLife. *joint first authorship. DOI: 10.7554/eLife.67340
  • Halliday FW*., Penczykowski RM*., Barrés B., Eck JL., Numminen E., Laine A-L. (2020). Facilitative priority effects drive parasite assembly under coinfection. Nature Ecology & Evolution *joint first authorship. DOI: 10.1038/s41559-020-01289-9
  • Halliday FW., Rohr JR. (2019). Measuring the shape of the biodiversity-disease relationship across systems reveals new findings and key gaps. Nature Communications. DOI: 10.1038/s41467-019-13049-w
  • Halliday FW., Heckman RW., Wilfahrt PA., Mitchell CE. (2019). Past is prologue: Host community assembly and the risk of infectious disease over time. Ecology Letters. DOI: 10.1111/ele.13176
  • Halliday FW., Umbanhowar J., Mitchell CE. (2017). Interactions among symbionts operate across scales to influence parasite epidemics. Ecology Letters. 20: 1285–1294. DOI: 10.1111/ele.12825

Weiterführende Informationen

Fletcher Halliday

Fletcher Halliday


Department of Evolutionary Biology and Environmental Studies
University of Zurich
Winterthurerstrasse 190
8057 Zurich

Office: Y13-H-22
Phone: +41 44 635 6119