-Fulbright Postdoctoral Fellow, Australian-American Fulbright Foundation, The University of California, 1994- 97
-Adjunct Professor, Weinberg College of Arts & Sciences, Northwestern University, 2003 – present
- Mycorrhizal fungal diversity, functioning, and ecology
- Effects of altered precipitation, land-use, and soil fertility on plant-mycorrhizal interactions
- Using mycorrhizas to promote the recovery and restoration of rare plants
- Soil ecosystem services in sustainable agriculture
My research focuses on furthering our understanding of the mycorrhizal symbiosis and its role in plant community composition and function.
Although largely hidden from us, mycorrhizal fungi are ubiquitous symbiotic partners within the roots of almost all land plants. These symbioses enhance nutrient and water uptake by plants, and also play a key role in stabilizing soils and enhancing carbon sequestration. As a result, any changes in the abundance of these fungi could feed back to influence the plant community and ecosystem health.
My current research projects reflect my interest in documenting the diversity of mycorrhizal fungi, their role in plant survival, and their responses to alterations in climate, land-use, and urbanization:
- Arbuscular mycorrhizal community responses to shifting soil moisture regimes and soil nitrogen levels in a dry tropical forests. We have installed rainout shelters to examine the extent to which mycorrhizal fungal diversity and function may be influenced by shifts in rainfall, and their resilience to changes in the global environment. We have also initiated a nitrogen (N) fertilization project to examine the effects of increasing N inputs into tropical forests. Location: Yucatán Peninsula, Mexico.
- Integrating mycorrhizal ecology into the rescue of imperiled and threatened plants. The majority of management plants for the rescue and recovery of rare plant populations focus on aboveground traits, e.g., seed set and viability. In this project, we are examining belowground factors that control plant survival, specifically, microsite conditions and mycorrhizal communities, in the highly threatened Mulanje cedar, and developing successful methods for transplanting seedling. Location: Mt. Mulanje, Malawi.
- Soil ecosystem services. Metrics of soil health (or quality) and ecosystem services have been frequently used to describe and monitor soil systems in agricultural fields. We are currently using a variety of soil chemical, physical and biological properties to calculate soil health indices, and determine how well these indices describe the status of restored grasslands and sustainable agriculture. Locations: Chicago; Hawaii.
- Ning, C., Mueller, G.M., Egerton-Warburton, L.M., Xiang, W., and Yan, W. (2019). Host phylogenetic relatedness and soil nutrients shape ectomycorrhizal community composition in native and exotic pine plantations. Forests 10: 263.https://doi.org/10.3390/f10030263
- Ning, C., Mueller, G.M., Egerton-Warburton, L.M., Wilson, A.W., Yan, W., and Xiang, W. (2018). Diversity and functioning of ectomycorrhizal fungal communities following nitrogen fertilization in an urban-adjacent pine plantation. Forests 9: 99; https://doi.org/10.3390/f9030099
- Desai, N., Wilson, A.W., Powers, J.M., Mueller, G.M., and Egerton-Warburton, L.M. (2016). Mycorrhizal community structure in Quercus oleoides in a restored seasonally dry tropical forest. Environmental Research Letters 11: 125007. Special Issue on Conservation of Dry Seasonal Tropical Forests.
- Ning, C., Mueller, G.M., Egerton-Warburton, L.M., Xiang, W., Yan, W. and Liu, Y. (2020). Differences in ectomycorrhizal community assembly between native and exotic pines are reflected in their enzymatic functional capacities. Plant and Soil 446: 179–193. https://doi.org/10.1007/s11104-019-04355-9
- Treseder, K.K., Allen, E.B., Egerton-Warburton, L.M., Hart, M.M., Johnson, N.C., Klironomos, J.N., Maherali, H., Powell, J.R., and Tedersoo, L. (2018). Arbuscular mycorrhizal fungal traits could mediate ecosystem responses to nitrogen deposition. Journal of Ecology 106: 480-489. Special Issue on Mycorrhizal Fungi as Drivers and Modulators of Ecosystem Processes.
- Querejeta, J.I., Egerton-Warburton, L.M., Prieto, I., Vargas, R., and Allen, M.F. (2012). Changes in soil hyphal abundance and viability can alter the patterns of hydraulic redistribution by plant roots. Plant and Soil 355: 63-73.
- Querejeta, J.I., Egerton-Warburton, L.M., and Allen, M.F. (2009). Differential access to groundwater modulates the mycorrhizal responsiveness of oaks to inter-annual rainfall variability in a California woodland. Ecology 90: 649-662.
- DeLong, J.R., Swarts, N., Dixon, K.W., and Egerton-Warburton, L.M. (2013). Mycorrhizal preference promotes habitat invasion by a native Australian orchid: Microtis media. Annals of Botany 111: 409-418.
- Egerton-Warburton, L.M., Johnson, N.C., and Allen, E.B.(2007). Mycorrhizal community dynamics following nitrogen fertilization: a cross-site test in five grasslands. Ecological Monographs 77: 527-544.
- Querejeta, J.I.,Egerton-Warburton, L.M., and Allen, M.F. (2003). Direct nocturnal water transfer from oaks to their mycorrhizal symbionts during severe soil drying. Oecologia 134: 55-64.
- Egerton-Warburton,M., Graham, R.C., Allen, E.B, and Allen, M.F. (2001). Reconstruction of the historical changes in mycorrhizal fungal communities under anthropogenic nitrogen deposition. Proceedings of the Royal Society of London, Series B 268: 2479-2484.
- Egerton-Warburton, L.M., and Allen, E.B. (2000). Shifts in the diversity of arbuscular mycorrhizal fungi along an anthropogenic nitrogen deposition gradient. Ecological Applications 10: 484- 496.
- Yost, J.L.*, Egerton-Warburton, L.M., Schreiner, K.M., Palmer, C.E., and Hartemink, A.E. (2016). Impact of restoration and management on aggregation and organic carbon accumulation in urban grasslands. Soil Science Society of America Journal 80: 992-1002. *Undergraduate student author
- Sollenberger, D., *Kadlec, C., O’Shaughnessy, J. and Egerton-Warburton, L.M. (2016). Environmental filtering mediates grassland community assembly following restoration with soil carbon additions. Restoration Ecology 24: 626–636.*Undergraduate student co-author
- Allen, E.B., Allen, M.F., Egerton-Warburton, L.M., Corkidi, L., and Gomez-Pompa, A. (2003). Impacts of early- and late-seral mycorrhizae during restoration in seasonal tropical forest, Mexico. Ecological Applications 13: 1701-1717.