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Mary Ann Fajvan

Research Forester
Ecology and Management of Invasive Species and Forest Ecosystems
180 Canfield St.
Morgantown, WV 26505
United States
Current Research
  • In 2005-07 I established two new research projects using silvicultural treatments in an attempt to make stands more resistant to hemlock woolly adelgid (HWA) and beech bark disease. For HWA, I selected four non-infested hemlock stands on the Allegheny National Forest and designed a thinning study to reduce stand density and improve hemlock vigor before HWA attack. We are now expanding the study into New England. We will examine growth changes in released trees as well as monitor their foliar nutrient content over time. The objective of the beech bark disease study is to determine if visually resistant beech trees can serve as a source of resistant beech regeneration as part of the shelterwood regeneration method. The project is also on the Allegheny NF and involves using herbicides to eliminate nonresistant beech regeneration.
  • Two other new studies involve (1) modeling tree regeneration height growth in oak shelterwood studies and (2) using dendrochronolgy to model growth in mature oak forests.
Research Interest
My research program focuses on studies of stand dynamics and silviculture in oak-dominated forests and associated hemlock forests in response to natural and human disturbances, including invasive species. I would like to develop new projects that examine the combined disturbance effects of exploitative harvesting practices, invasive species, and over browsing by white-tailed deer on stand development.
Why This Research Is Important
My research examines the dynamics of how forests change in relationship to natural and human disturbances. Understanding these ecological trends assists scientists, managers and landowners in maintaining forest sustainability.
  • University of Maine, Ph.D., Quantitative Silviculture, 1991
  • Yale School of Forestry and Environmental Studies, M.S., Silviculture, 1983
  • Rutgers University, Cook College, B.S., Natural Resource Management, 1981
Professional Organizations
  • Society of American Foresters (SAF),  Current
  • Ecological Society of America,  Current
Other Publications
Research Highlights

Thinning Effects on Foliar Elements in Eastern Hemlock: Implications for Managing the Spread of Hemlock Woolly Adlegid

Year: 2016
With the imminent entrance of hemlock woolly adlegid (HWA) into forest stands in the Allegheny National Forest in Pennsylvania, it was critical to understand whether silvicultural thinning results in increased foliage palatability for HWA. Forest Service research findings suggest that thinning may b...

Collaboration seeks to preserve Chesapeake Bay Watershed health in the face of hemlock decline

Year: 2017
Few studies have examined how insect outbreaks affect landscape-level hydrologic processes. Anticipating hydrologic impacts resulting from the decline of hemlock trees in watersheds infested with hemlock wooly adelgid, Forest Service scientists are partnering with state and federal conservation agen...