Fordham University            The Jesuit University of New York

faculty gif
James D. Lewis

James D. Lewis   Professor & Department Chair

Department of Biological Sciences
Fordham University
441 East Fordham Road
Bronx, NY 10458
Louis Calder Center
53 Whippoorwill Rd., Box 887
Armonk, NY 10504
Phone: 914-273-3078, ext. 24
Fax: 914-273-6346
Education and Training
B.S., The Pennsylvania State University, Biology, 1989
M.S., The Pennsylvania State University, Ecology, 1989
Ph.D., Duke University, Botany, 1994
Postdoc, National Research Council Resident Research Associate (U.S.
E.P.A., Western Ecology Division), Corvallis, Oregon, 1995–98

Research Interests

Invasive, non-native organisms, climate change, and habitat fragmentation have been identified as the three greatest threats to biodiversity globally. Research in my lab focuses on plant and community responses to these factors, and on the mechanisms that regulate responses to these factors. As an example, we are examining the broad impacts of urbanization on plants and communities. Research sites include the Calder Center, Central Park, Black Rock Forest, the New York Botanical Garden, and other preserves and parks in southern New York.


A related project is examining the mechanisms regulating plant responses to environmental factors such as climate change and urbanization. These projects include research on the relative contributions of developmental and physiological processes to plant responses to the environment. A key area of research is disentangling effects of plant age and plant developmental stage on responses to the environment. Much of this work has been funded by the NSF.


Other projects we are collaborating on include research on forest responsesto loss of eastern hemlock (Tsuga canadensis) due to the hemlock woolly adelgid (HWA), an invasive non-native insect. The HWA generally causes extensive hemlock mortality at the stand level within five years of initial invasion. Decline of eastern hemlock may have far-reaching effects because of the unique suite of environmental characteristics associated with hemlock-dominated forests. Some objectives of our research are to examine how forest compositionregulatesthe effects of the HWA on species diversity and productivity, and to examine the effects of changes in productivity on resource transfer between trophic levels. Much of this work has been funded by the USDA competitive grants program.


Current research opportunities in the Lewis Lab


We have research opportunities for graduate, undergraduate, and high school students broadly interested in plant or forest ecology. While much of our research focuses on the impacts of invasive species, climate change, and urbanization on plants, and on the interactive effects of physiology and development in regulating plant responses to the environment, student projects also addresses a variety of other topics, reflecting the various interests of the students in my lab.


If you are interested in pursuing a graduate degree in our program, please feel free to contact me directly ( to find out more about our program.


I am also the assistant director of the Calder Summer Undergraduate Research (CSUR) program, an NSF-funded REU Site program. If you are interested in participating in this program, please feel free to contact me directly (, or check out our webpage for more information.

Publications HERE

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