IPS - Intensive Plot System
||To describe gypsy moth population dynamics in different habitat
||NY:Whitehall, Lake George area.
MA:Harwich, Hawkness State Forest, Cape Cod.
MA: Ludlow, Ludlow Reservoir.
NJ:New Lisbon, Lebanon State Forest.
Locations were in woodlands that contain extensive acreages
of varying mixtures of host and non-host tree species. Areas
chosen all had potentially defoliating populations at the beginning
of the study. Areas chosen have a network of roads to permit
access to the sites. Sites are relatively homogeneous with respect
to soil, soil moisture conditions, and plant cover. Less than
50' elevation difference exists within a site.
||Six 12-hectare study areas, each divided into six 2-hectare
sites with five 0.5-acre plots in each site; actual number of
sites per area varied from 5 to 8. Design and selection of study
areas per plot by Robert Campbell.
|Likelihood of Locating Study Areas:
||None besides natural defoliation from gypsy moths.
||Visual determinations were made of egg masses each winter
and percent defoliation the following summer.
|Variables and Sampling Frequency:
||Dependent: Defoliation, diameter, dominance & condition
of trees in plots. Gypsy Moth egg mass and locations.
||Each plot was marked with a metal stake, maps exist of some
plot locations. Numerous subsets of the IES data were produced;
the 9-track tape at Hamden has documentation attesting to its
reliability and that it is the "best" version; however, it does
not contain all the variables measured in the IES plots.
||Three file cabinets at Ansonia, CT. contain hardcopy of original
tally sheets and summary statistics. One 9-track tape in Hamden,
CT. contains corrected, verified egg mass, defoliation, tree
health, and site variables. One 9-track tape and 1 diskette
in Morgantown, WV. (M.J. Twery) contains tree condition and
egg mass counts for the Ticonderoga, Dresden, and Whitehall,
|Global Change Research Applications:
||Studies of Ecosystem Processes Model Development and Application
|Publications and Reports:
||Campbell, R.; Sloan, R.J. 1978. Natural maintenance and decline
of Gypsy Moth outbreaks. Environmental Entomology, June 1978.
R.C. Rearden. 1976. Parasite incidence and ecological relationships
in field populations of Gypsy Moth larvae and pupae. Environmental
Entomology, October 1976. 5(5): 981-987.
M. Montgomery. 1990. Chapter 7 - role of site and insect
variables in forecasting defoliation by the Gypsy Moth. In:
Watt, A.D.; Leather, S.R.; Hunter, M.D.; Kidd, N.A.C., eds.
Population dynamics of forest insects. Intercept, Ltd. 73-84.
||Mike Montgomery, USDA Forest Service, 51 Mill Pond Rd., Hamden
CT 06514. (203) 230-4331
||Numerous cooperators existed during active data collection