TITLE

	Forest Response to Stress and Damage  (FORSTAD) Gypsy Moth Data 1980-2000





PRINCIPAL INVESTIGATORS

	Clive Jones

	Charles Canham

	Gary Lovett

	Rick Ostfeld



BEGIN DATE

	1980



END DATE

	2000



LOCATION

	On Cannoo (Tea House) Hill, on the property of the Institute of Ecosystem Studies, on the Cary Arboretum, in Millbrook, New York.  (41( 47(N, 73( 44(W)  



LOCATION DESCRIPTION

	The twenty Tea House Hill plots are circular areas, ten meters in diameter.  They are arranged in two perpendicular transects, forming a cross over the length and width of Tea House Hill.  The space between plots varies from 30 meters to 130 meters, and the terrain ranges from almost flat to a slope of about 25 degrees.  The center of each plot is marked with a fiberglass T-post, and the edges of the plots are marked with PVC posts.  Each tree > 7cm DBH is tagged with a unique number, and species and DBH have been recorded.



ACCESS

	Public



DATA LOCATION

	Institute of Ecosystem Studies, Millbrook, New York



LAST UPDATED

	June, 2001



CONTACT PERSON

	Clive Jones

	Institute of Ecosystem Studies

	PO Box AB

	Millbrook, NY 12545

	Telephone: (845) 677-5343



CODES

Density = gypsy moth egg mass density 	



DATA DESCRIPTION

	Gypsy moth density is presented in egg masses/hectare for each year of data collection.  



SAMPLING DESIGN

	Plots are sampled between November and April, after leaf drop and before the eggs hatch in the spring.  The following substrates are searched:

1. Live trees > 7cm DBH

2. Standing dead trees

3. Fallen dead trees

4. Litter (i.e. coarse woody debris)

5. Rocks

6. Live trees < 7cm DBH

A thorough search of all substrates is conducted, and the number of egg masses found on each substrate is noted.  On live trees and standing dead trees, only egg masses found at < 2m height are counted.  Above this height, it is possible to visualize egg masses but impossible to examine them to determine if it is a current year's egg mass or an old one.



NOTES

	In years of very low gypsy moth density, it is possible that no egg masses are found on these twenty plots.  In these years, off-plot searches are conducted until at least one egg mass has been found.  The area searched is tallied and used to produce the density estimate in egg masses/hectare for that year.  This occurred in 1985, 1986, 1992, 1998, and 1999.



DATA