Scientists & Staff

Mark Twery

Scientist Emeritus

Sustaining Forests in a Changing Environment

The University of Vermont Aiken Center; 81 Carrigan Drive

Burlington, VT, 05405

Phone: 802-656-1716

Contact Mark Twery

Current Research

My primary personal research focus is NED, a set of decision-support tools for forest management for multiple benefits. Other research interests include biotic disturbances in forests, regeneration dynamics, stand development, and the roles of humans in the ecosystem.
I have active studies examining the effects of various silvicultural practices on several different components of the forest, including the trees, vascular flora, deer browsing, and salamanders.
I am participating in several studies of beech bark disease, focusing on its effects on the composition and structure of the residual forest.
I have ongoing work addressing public participation in forest planning activities.
I am active in working with educators to develop environmental literacy components to public school curricula. I have collaborative studies working with managers of reservoirs and city parks to develop forest management plans for their properties.

Research Interests

Develop integrated decision-support systems for forest management for multiple benefits.
Investigate relative effects of different silvicultural systems for a variety of forest benefits.
Provide tools for urban forest managers to evaluate alternative management activities on their forested properties

Education

Yale University, School of Forestry & Environmental Studies, Ph.D. Silviculture, 1987
University of Massachusetts at Amherst, M.S. Forest Ecology, 1983
Oberlin College, A.B. Theater Arts, 1972

Featured Publications & Products

Twery, Mark J.; Weiskittel, Aaron R. 2013. Forest-management modelling. In: Wainwright, John; Mulligan, Mark, eds. Environmental modelling: finding simplicity in complexity. Second edition. Chapter 13 John Wiley & Sons, Ltd: 379-397.
Twery, Mark J.; Olson, Elizabeth; Wade, Gary L.; Rechlin, Michael. 2013. Changes in abundance of vascular plants under varying silvicultural systems at the Forest Ecosystem Research and Demonstration Area, Paul Smiths, New York. Res. Note NRS-169. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 10 p.
Twery, Mark J.; Knopp, Peter D.; Thomasma, Scott A.; Nute, Donald E. 2012. NED-2 reference guide. Gen. Tech. Rep. NRS-86. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 728 p.
Twery, Mark J.; Knopp, Peter D.; Thomasma, Scott A.; Nute, Donald E. 2011. NED-2 User's Guide. Gen. Tech. Rep. NRS-85. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 193 p.
Meador, Cassie; Twery, Mark; Leatherbury, Meagan. 2011. Moving Field Guides. Legacy Magazine. 22(6): 26-27.
Twery, Mark J.; Hildreth, Sandra J.; Evans, Celia A. 2008. Bringing the northern forest to your classroom. Gen. Tech. Rep. NRS-21. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 59 p.
Janowiak, Maria K.; Swanston, Christopher W.; Nagel, Linda M.; Webster, Christopher R.; Palik, Brian J.; Twery, Mark J.; Bradford, John B.; Parker, Linda R.; Hille, Andrea T.; Johnson, Sheela M. 2011. Silvicultural decisionmaking in an uncertain climate future: a workshop-based exploration of considerations, strategies, and approaches. Gen. Tech. Rep. NRS-81. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 14 p.
Evans, Celia A.; Lucas, Jennifer A. ; Twery, Mark J. 2005. Beech Bark Disease: Proceedings of the Beech Bark Disease Symposium. Gen. Tech. Rep. NE-331. Newtown Square PA, US. Department of Agriculture Forest Service, Northern Research Station. 149 p.
Knopp, Peter D.; Twery, Mark J. 2006. NEDLite user's manual: forest inventory for Palm OS handheld computers. Gen. Tech. Rep. NE-340. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 64 p.

Publications & Products

Stout, Susan L.; Brose, Patrick H.; Cleveland, Helene ; Long, Robert P.; McGuinness, Barbara ; Peters, Matthew P.; Rebbeck, Joanne ; Ristau, Todd ; Royo, Alejandro A.; Stoleson, Scott H.; Thomasma, Scott ; Twery, Mark J.; Wurzbacher, Sarah. 2019. Fifty years of science-management cooperation from the SILVAH community of practice. In: Stout, Susan L., ed. SILVAH: 50 years of science-management cooperation. Proceedings of the Allegheny Society of American Foresters training session; 2017 Sept. 20-22; Clarion, PA. Gen. Tech. Rep. NRS-P-186. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 8-25.
Twery, Mark J. 2019. NED and SILVAH: A history of the coalition. In: Stout, Susan L., ed. SILVAH: 50 years of science-management cooperation. Proceedings of the Allegheny Society of American Foresters training session; 2017 Sept. 20-22; Clarion, PA. Gen. Tech. Rep. NRS-P-186. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 98-105.
Zald, Harold S.J.; Spies, Thomas A.; Harmon, Mark E.; Twery, Mark J. 2016. Forest carbon calculators: a review for managers, policymakers, and educators. Journal of Forestry
Berven, Kate; Kenefic, Laura; Weiskittel, Aaron; Twery, Mark; Wilson, Jeremy. 2013. The lost research of early northeastern spruce-fir experimental forests: a tale of lost opportunities. In: Camp, Ann E.; Irland, Lloyd C.; Carroll, Charles J.W. Long-term silvicultural and ecological studies. Results for science and management: volume 2. GISF Res. Pap. 013. New Haven, CT: Yale University, School of Forestry and Environmental Studies, Global Institute of Sustainable Forestry: 103-114.
Garnas, Jeffrey R.; Houston, David R.; Twery, Mark J.; Ayres, Matthew P.; Evans, Celia. 2013. Inferring controls on the epidemiology of beech bark disease from spatial patterning of disease organisms. Agricultural and Forst Entomology. 15: 146-156.
Hennigar, Chris; Amos-Binks, Luke; Cameron, Ryan; Gunn, John; MacLean, David A.; Twery, Mark. 2013. ForGATE - A Forest Sector Greenhouse Gas Assessment Tool for Maine: Calibration and Overview. Gen. Tech. Rep. NRS-116. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 54 p.
McIntosh, B. S.; Ascough II, J. C.; Chen, S.; Chew, J.; Cuddy, S.; Elmahdi, A.; Haase, D.; Harou, J.; Hepting, D.; Jakeman, A. J.; Kassahun, A.; Lautenbach, S.; Matthews, K.; Merritt, W.; Quinn, N. W. T.; Rodriguez-Roda, I.; Sieber, S.; Stavenga, M.; Sulis, A.; Ticehurst, J.; Twery, M. J.; Volk, M.; Wrobel, M.; van Delden, H.; El-Sawah, S.; Rizzoli, A.; Voinov, A. 2011. Environmental decision support systems (EDSS) development - Challenges and best practices. Environmental Modelling and Software. 26: 1389-1402.
Dennis, Donald F.; Twery, Mark J. 2007. Choice modeling: public preferences for enhancing benefits from private forests in the Adirondacks. In: Burns, R.; Robinson, K., comps. Proceedings of the 2006 Northeastern Recreation Research Symposium; 2006 April 9-11; Bolton Landing, NY. Gen. Tech. Rep. NRS-P-14. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 362-366.
Dennis, Donald F.; Twery, Mark J.; Rechlin, Michael A.; Hansen, Bruce. 2005. Survey Techniques for Assessing Public Preferences for Alternate Silvicultural Treatments in the Adirondacks. In: Bricker, Kelly, comp., ed. 2005. Proceedings of the 2004 Northeastern Recreation Research Symposium. Gen. Tech. Rep. NE-326. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 350-353.
Evans, Celia; Ayres, Matthew; Twery, Mark; Houston, David R.; Liebhold, Andrew; Liebhold, Andrew. 2005. Using Models to Identify Forests at Risk of Major Structure and Compositional Change due to Beech Bark Disease. In: Evans, Celia A., Lucas, Jennifer A. and Twery, Mark J., eds. Beech Bark Disease: Proceedings of the Beech Bark Disease Symposium; 2004 June 16-18; Saranak Lake, NY. Gen. Tech. Rep. NE-331. Newtown Square, PA: US. Department of Agriculture, Forest Service, Northeastern Research Station: 116-120.
Houston, David R.; Rubin, Benjamin D.; Twery, Mark J.; Steinman, James R.; Steinman, James R. 2005. Spatial and Temporal Development of Beech Bark Disease in the Northeastern United States. In: Evans, Celia A., Lucas, Jennifer A. and Twery, Mark J., eds. Beech Bark Disease: Proceedings of the Beech Bark Disease Symposium; 2004 June 16-18; Saranak Lake, NY. Gen. Tech. Rep. NE-331. Newtown Square, PA: US. Department of Agriculture, Forest Service, Northeastern Research Station: 43-47.
Kenefic, Laura S.; Twery, Mark J., eds. 2005. Changing Forests - Challenging Times: Proceedings of the New England Society of American Foresters 85th Winter Meeting. Gen. Tech. Rep. NE-325. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 85 p.
Nute, Donald; Potter, Walter D.; Cheng, Zhiyuan; Dass, Mayukh; Glende, Astrid; Maierv, Frederick; Routh, Cy; Uchiyama, Hajime; Wang, Jin; Witzig, Sarah; Twery, Mark; Knopp, Peter; Thomasma, Scott; Rauscher, H. Michael. 2005. A method for integrating multiple components in a decision support system. Computers and Electronics in Agriculture 49 (2005) 44-59
Twery, Mark J.; Knopp, Peter D.; Thomasma, Scott A.; Rauscher, H. Michael; Nute, Donald E.; Potter, Walter D.; Maier, Frederick; Wang, Jin; Dass, Mayukh; Uchiyama, Hajime; Glende, Astrid; Hoffman, Robin E. 2005. NED-2: a decision support system for integrated forest ecosystem management. Computers and Electronics in Agriculture 49:24-43
Twery, Mark J.; Knopp, Peter D.; Thomasma, Scott A.; Rauscher, H. Michael; Nute, Donald E.; Potter, Walter D.; Maier, Frederick; Wang, Jin; Dass, Mayukh; Uchiyama, Hajime; Glende, Astrid; Hoffman, Robin E. 2005. NED-2: A decision support system for integrated forest ecosystem management. Computers and Electronics in Agriculture 49 (2005) 24-43
Knopp, Peter D.; Twery, Mark J. 2004. NED Software for Sustainable Forest Management: New Developments. In: Yaussy, Daniel A.; Hix, David M.; Long, Robert P.; Goebel, P. Charles, eds. Proceedings, 14th Central Hardwood Forest Conference; 2004 March 16-19; Wooster, OH. Gen. Tech. Rep. NE-316. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 519.
Twery, Mark J. 2004. Modelling in forest management. In: Wainwright, John; Mulligan, Mark, eds. Environmental modelling: Finding Simplicity in Complexity. London, John Wiley & Sons, Ltd: 291-301.
Twery, Mark; Northrop, Robert. 2004. Watershed forest management using decision support technology. In: Proceedings, Society of American Foresters 2003 national convention; 2003 October 25-29; Buffaly, NY. Bethesda, MD: Society of American Foresters: 373-375.
Ward, Jeffrey S.; Twery, Mark J., eds. 2004. Forestry Across Borders: Proceedings of the New England Society of American Foresters 84th Winter Meeting. Gen. Tech. Rep. NE-314. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 44 p.
Dennis, Donald F.; Twery, Mark J.; Rechlin, Michael A.; Hansen, Bruce. 2003. Public attitudes toward programs designed to enhance forest related benefits on private lands. In: Schuster, Rudy, comp., ed. Proceedings of the 2002 Northeastern Recreation Research Symposium. Gen. Tech. Rep. NE-302. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 163-164
Guldin, James M.; Cawrse, David; Graham, Russell; Hemstrom, Miles; Joyce, Linda; Kessler, Steve; McNair, Ranotta; Peterson, George; Shaw, Charles G.; Stine, Peter; Twery, Mark; Walter, Jeffrey. 2003. Science Consistency Reviews A Primer for Application. The science consistency review: a primer for application. Publication FS-771. Washington, D.C.: U.S. Department of Agriculture, Forest Service, Washington Office. September 2003. 9 p.
Guldin, James M.; Cawrse, David; Graham, Russell; Hemstrom, Miles; Joyce, Linda; Kessler, Steve; McNair, Ranotta; Peterson, George; Shaw, Charles G.; Stine, Peter; Twery, Mark; Walter, Jeffrey. 2003. The Science Consistency Review A Tool To Evaluate the Use of Scientific Information in Land Management Decisionmaking. The science consistency review: a tool to evaluate the use of scientific information in land management decisionmaking. Publication FS-772. Washington, D.C.: U.S. Department of Agriculture, Forest Service, Washington Office. September 2003. 29 p.
Knopp, Peter D.; Twery, Mark J. 2003. Stewplan: software for creating forest stewardship plans (Version 1.3). Gen. Tech. Rep. NE-301. [Computer program]. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 12 p.
Nute, Donald; Potter, Walter D.; Dass, Mayukh; Glende, Astrid; Maier, Frederick; Uchiyama, Hajime; Wang, Jin; Twery, Mark; Knopp, Peter; Thomasma, Scott; Rauscher, H. Michael. 2003. An agent architecture for an integrated forest ecosystem management decision support system. Decision Support for Multiple Purpose Forestry, April 23-25, Vienna, Austria, p. 1-11
Wade, Gary L.; Myers, Jonathan A.; Martin, Cecilia R.; Detmar, Kathie; Mator, William, III; Twery, Mark J.; Rechlin, Mike. 2003. Vascular Plant Species of the Forest Ecology Research and Demonstration Area, Paul Smith's, New York. Res. Note NE-380. Newtown Squre, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 6 p.
Nute, Donald; Potter, Walter D.; Maier, Frederick; Wang, Jin; Twery, Mark; Rauscher, H. Michael; Knopp, Peter; Thomasma, Scott; Dass, Mayukh; Uchiyama, Hajime. 2002. Intelligent Model Management in a Forest Ecosystem Management Decision Support System. In: Integrated Assessment and Decision Support Proceedings of the First Biennial Meeting on the International Environmental Modeling and Software Society, IEMSs; 2002 June 24-27; Switzerland: University of Lugano; Vol. 3: 396-401.
Twery, Mark J.; Rauscher, H. Michael. 2002. NED Software for Forest Management: Much More Than Cruising. In: Fox, Caroline A. ed. 2001 Workshop Proceedings Forest Measurements for Natural Resource Professionals; 2001 November 09; Hillsborough. Durham, NH: University of New Hampshire Cooperative Extension: 51-56.
More, Thomas A.; Twery, Mark J. 2001. The forest service's recreation agenda: comments on the roles of research and state and private forestry in the Northeast. In: Kyle, Gerard, comp., ed. 2001. Proceedings of the 2000 Northeastern Recreation Research Symposium. Gen. Tech. Rep. NE-276. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 273-275
Rauscher, H. Michael; Spearman, John E.; Fout, C. Preston; Giles, Robert H.; Twery, Mark J. 2001. Talking high-tech turkey: USDA uses new software to analyze habitat management scenarios. Tree Farmer. 20(3): 6-9.
Rauscher, H. Michael; Lloyd, F. Thomas; Loftis, David L.; Twery, Mark J. 2000. A Practical Decision-Analysis Process for Forest Ecosystem Management. Computers and Electronics in Agriculture 27 (2000) 195-226
Rauscher, H. Michael; Plant, Richard E.; Thomson, Alan J.; Twery, Mark J. 2000. Foreword. Computers and Electronics in Agriculture. 27:1-6.
Twery, Mark J. ; Rauscher, H. Michael; Bennett, Deborah J.; Thomasma, Scott A.; Stout, Susan L.; Palmer, James F.; Hoffman, Robin E.; DeCalesta, David S.; Gustafson, Eric; Grove, J. Morgan; Nute, Donald; Kim, Geneho; Kollasch, R. Peter. 2000. NED-1: integrated analyses for forest stewardship decisions. Computers and Electronics in Agriculture 27 (2000) 167-193
Twery, Mark J.; Rauscher, H. Michael; Bennett, Deborah J.; Thomasma, Scott A.; Stout, Susan L.; Palmer, James F.; Hoffman, Robin E.; DeCalesta, David S.; Gustafson, Eric; Cleveland, Helene; Grove, J. Morgan; Nute, Donald; Kim, Geneho; Kollasch, R. Peter. 2000. NED-1: integrated analyses for forest stewardship decisions. Computers and Electronics in Agriculture. 27: 167-193.
Hoffman, Robin E.; Twery, Mark J.; Alban, Laura M.; Nyland, Ralph D. 1999. Forests and People. United States Department of Agriculture Forest Service Northeastern Forest Experiment Station Northeastern Area State & Private Forestry, NE-INF-138-99. 12 p.
Nute, Donald; Kim, Geneho; Potter, Walter D.; Twery, Mark J.; Rauscher, H. Michael; Thomasma, Scott; Bennett, Deborah; Kollasch, Peter. 1999. A Multi-criterial Decision Support System for Forest Management. Enviromental Decision Support Systems and Artificial Intelligence, Papers from the AAAI Workshop
Reynolds, Keith; Bjork, Jennifer; Hershey, Rachel Riemann; Schmoldt, Dan; Payne, John; King, Susan; DeCola, Lee; Twery, Mark J.; Cunningham, Pat. 1999. Decision Support for Ecosystem Management (Chapter 28). Proceedings, Ecological Stewardship Workshop. Chapter 28: 687-721.
Thomasma, Scott A.; Thomasma, Linda Ebel; Twery, Mark J. 1998. NEWILD (version 1.0) user's manual [Computer program]. Gen. Tech. Rep. NE-242. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 28 p.
Yanai, Ruth D.; Twery, Mark J.; Stout, Susan L. 1998. Woody understory response to changes in overstory density: thinning in Allegheny hardwoods. Forest Ecology and Management. 102: 45-60.
Mowrer, H. Todd; Barber, Klaus; Campbell, Joe; Crookston, Nick; Dahms, Cathy; Day, John; Laacke, Jim; Merzenich, Jim; Mighton, Steve; Rauscher, Mike; Sojda, Rick; Thompson, Joyce; Trenchi, Peter; Twery, Mark. 1997. Decision support systems for ecosystem management: An evaluation of existing systems. Gen. Tech. Rep. RM-GTR-296. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station. 154 p.
Alban, Laura Miller; Thomasma, Scott A.; Twery, Mark J. 1995. Forest Stewardship Planning Guide (version l.00) user's manual (Computer Program). Gen. Tech. Rep. NE-203. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 15 p. [1 computer disk (3-1/2in.); User's Manual.]
Muzika, R. M.; Twery, M. J. 1995. Regeneration in defoliated and thinned hardwood stands of north-central West Virginia. In: Gottschalk, Kurt W.; Fosbroke, Sandra L. C., ed. Proceedings, 10th Central Hardwood Forest Conference; 1995 March 5-8; Morgantown, WV.: Gen. Tech. Rep. NE-197. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 326-340
Simpson, Brian T.; Kollasch, R. Peter; Twery, Mark J.; Schuler, Thomas M. 1995. NED/SIPS user's manual: Northeast decision model stand inventory processor and simulator (Version 1.00) (Computer program). Gen. Tech. Rep. NE-205. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 103 p. [1 computer disk (3-1/2 in.); User's manual.]
Feicht, David L.; Fosbroke, Sandra L. C.; Twery, Mark J. 1993. Forest stand conditions after 13 years of gypsy moth infestation. In: Gillespie, Andrew R.; Parker, George R.; Pope, Phillip E.; Rink, George: eds. Proceedings of the 9th Central Hardwood Forest Conference; Gen. Tech. Rep. NC-161. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station: 130-144
Gottschalk, Kurt W.; Twery, Mark J.; [Editors]. 1992. Proceedings U.S. Department of Agriculture interagency gypsy moth research forum 1991; 1991 January 14-17; Annapolis, MD. . Gen. Tech. Rep. NE-167. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 54 p.
Gottschalk, Kurt W.; Twery, Mark J.; [Editors]. 1992. Proceedings U. S. Department of Agriculture Interagency gypsy moth research forum 1992; 1992 January 13-16; Annapolis, MD. . Gen. Tech. Rep. NE-170. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 60 p.
Gottschalk, Kurt W.; Twery, Mark J.; Smith, Shirley I.; [Editors]. 1991. Proceedings, U. S. Department of Agriculture interagency gypsy moth research review 1990. Gen. Tech. Rep. NE-146. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 152p.
Hollenhorst, S.J.; Brock, S.M.; Freimund, W.A.; Twery, M.J. 1991. Effects of gypsy moth infestation on near-view aesthetic preferences and recreation behavior intentions. In: McCormick, Larry H.; Gottschalk, Kurt W., eds. Proceedings, 8th Central Hardwood Forest Conference; 1991 March 4-6; University Park, PA. Gen. Tech. Rep. NE-148. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 23-33.
Twery, M.J. 1991. Understory composition of hardwood stands in north central West Virginia. In: McCormick, Larry H.; Gottschalk, Kurt W., eds. Proceedings, 8th Central Hardwood Forest Conference; 1991 March 4-6; University Park, PA. Gen. Tech. Rep. NE-148. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 601-602.
Twery, Mark J. 1991. Effects of defoliation by gypsy moth. IN: Gottschalk, Kurt W.; Twery, Mark J.; Smith, Shirley I., eds. Proceedings, U.S. Department of Agriculture interagency gypsy moth research review 1990; East Windsor, CT. Gen. Tech. Rep. NE-146. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 27-39.
Twery, Mark J.; Elmes, Gregory A. 1991. Hazard rating for gypsy moth on a Macintosh computer: a component of the GypsES system. IN: Gottschalk, Kurt W.; Twery, Mark J.; Smith, Shirley I., eds. Proceedings, U.S. Department of Agriculture interagency gypsy moth research review 1990; East Windsor, CT. Gen. Tech. Rep. NE-146. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 63.
Twery, Mark J.; Wargo, Philip M. 1991. Development of a sampling system for Armillaria rhizomorphs in mixed oak stands: a progress report. In: Gottschalk, Kurt W.; Twery, Mark J.; Smith, Shirley I., eds. Proceedings, U.S. Department of Agriculture interagency gypsy moth research review 1990; East Windsor, CT. Gen. Tech. Rep. NE-146. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 128.
Twery, Mark J.; Mason, Garland N.; Wargo, Philip M.; Gottschalk, Kurt W. 1990. Abundance and distribution of rhizomorphs of Armillaria spp. in defoliated mixed oak stands in western Maryland. Canadian Journal of Forest Research. 20: 674 678.
Gottschalk, Kurt W.; Twery, Mark J. 1989. Gypsy moth impacts in pine-hardwood mixtures. In: Waldrop, Thomas A., ed. Proceedings of pine-hardwood mixtures: A symposium on management and ecology of the type; 1989 April 18-19; Atlanta, GA. Gen. Tech. Rep. SE-58. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station: 50-58.
Twery, Mark J.; Patterson, W.A. 1983. Effects of species composition and site factors on the severity of beech bark disease in western Massachusetts and the White Mountains of New Hampshire: a preliminary report. In: Proceedings, I.U.F.R.O. Beech Bark Disease Working Party Conference; 1982 September 26-October 8; Hamden, CT. Sponsored by the USDA Forest Service, Northeastern Forest Experiment Station. Gen. Tech. Rep. WO-37. [Washington, DC]: U.S. Department of Agriculture, Forest Service: 127-133.

National Research Highlights

Dr. Mark Twery of the NRS describing the structure of a dandelion stem to participants in the Moving Field Guide workshop at Patterson Park in Baltimore. Steward Pickett, Baltimore Ecosystem Study LTER, Cary Institute of Ecosystem Studies

Moving Field Guides: Learning ecology through dance

Year: 2011

Children in Baltimore, MD, are working with Forest Service researchers and the Dance Exchange, a professional dance company, to turn their observations into movements as they learn about the environment. The result, a Moving Field Guide, is a dance representing natural events, such as bark sloughing off a tree and ducks migrating, that links students to their local environments in personal and enduring ways.

Last modified: Thursday, September 10, 2015