Current Duke Appointments & Affiliations
Professor of Biology
·
2015 - Present
Biology,
Trinity College of Arts & Sciences
Recent Scholarly Works
Fungal endophytes of an endangered tree vary with stress and microenvironment in an ex situ conservation nursery.
Journal article American journal of botany · April 2026 PremisePlants in ex situ conservation nurseries acquire diverse fungal associates that may be moved among nurseries or into the wild during outplanting, including fungal endophytes that contribute to a broad range of functions and occur in leaves, ... Full text CiteGlobal Role of Vanadium for Cryptogamic Nitrogen Fixation in Extratropical Forests.
Journal article Environmental science & technology · March 2026 Biological nitrogen fixation (BNF) by nitrogenase is often assumed to rely on molybdenum as an enzymatic cofactor, despite molybdenum scarcity in terrestrial ecosystems relative to vanadium and iron, two alternative cofactors. Findings that cyanolichens ac ... Full text CiteNitrogen fixation in Arctic lichens and mosses: A survey across circumpolar subzones.
Journal article The Science of the total environment · October 2025 Nitrogen bioavailability frequently constrains primary production in the Arctic with tundra communities vulnerable to ecological and metabolic disruption from climate variability. Diazotrophs associated with lichens and mosses are the primary source of new ... Full text CiteRecent Grants
Collaborative Research: Leveraging historical collections and new surveys to characterize foundational shifts in vital symbioses in the threatened Arctic
ResearchPrincipal Investigator · Awarded by National Science Foundation · 2020 - 2026Digitization TCN: Collaborative Research: Building a global consortium of bryophytes and lichens: keystones of cryptobiotic communities
ResearchCo-Principal Investigator · Awarded by National Science Foundation · 2020 - 2025Spatio-temporal factors shaping symbiotic networks: a case study with cyanolichens
ResearchPrincipal Investigator · Awarded by National Science Foundation · 2019 - 2024View All Grants
Education
Duke University ·
1995
Ph.D.
Ottawa University ·
1990
M.S.
Grinnell College ·
1987
B.S.