Research: Ancillary Studies
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Tree shelters for oak seedlings:
deer numbers appear to be on the rise on the Holt Research Forest. This could be due to a
regional increase. Superimposed on this, we may have encouraged the entry
of more deer into the Holt via the small harvest gaps created in 1987. Browsing is severe enough to suggest deer have had a negative impact
on oak regeneration. In 2000, Al Kimball began comparing oak sapling growth
between two treatments
that might commonly be used by landowners to protect oak saplings from deer: 1) Bitrex (a bitter-tasting
deer-repellent), and 2) tree shelters. Tree shelters provide physical
protection from deer plus a micro-environment of warmth and carbon
1992 we have sent ticks collected from Holt Forest small mammals to Dr.
Peter Rand and Dr. Robert Smith, Jr. of the Maine Medical Center
Lyme Disease Research Lab. They are researching the the role of
hosts, climate, and habitat factors affecting tick distribution in Maine.
- Dr. Joanne M. Sharpe began a
long-term study of selected fern species on the Holt Research Forest in
1999. She is doing this in the context of a termperate/tropical
comparison of long-term demographic and ecological trends in ferns.
Her temperate sites are in Maine, and her tropical sites include the Luquillo
Experimental Forest LTER and the Jobos
Bay National Estuarine Research Reserve, both in Puerto Rico.
- In 1997 Genevieve Pullis and
Kevin Boyle of the University of Maine
Resource Economics and Policy tested public
perceptions of forest management activities at the Holt Research
Forest. They found considerable differences among various segments of the public,
but overall strong support for policies that balance timber harvesting and
setting land aside from harvesting (Pullis 1998).
- In 1990 Bill Ostrofsky of the Maine Cooperative Forestry Research Unit
Kimball determined that trees released by the winter
1987-88 harvest did not show increased vigor.
- From 1993 through 1998, Nat Wheelwright of Bowdoin College
assisted with a study of the reproductive
effort of 15 species of herbs and shrubs. Results are to be announced.