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Research
PNW
Funded Projects
2001
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PNW
Project Overview 1997
Response
of Coarse Woody Debris Invertebrates in Managed 50-70 year-old Stands on
the Olympic Peninsula, Thinned to Create Late Successional Habitat
Principal
Investigators:
Dr.
Robert Edmonds, University of Washington, College of Forest
Resources
Dr. Jim Marra, University of Washington, College of Forest Resources
Awarded: $54,446
Project
Description:
In
cooperation with the USDA Forest Service Habitat Development Study (HDS),
this project begins a post-treatment follow-up study to the two years of
pretreatment investigations into the invertebrate community inhabiting
coarse woody debris (CWD). The pretreatment study was conducted in four
ranger districts on the Olympic National Forest (Quinault, Soleduck,
Quilcene and Hood Canal). This study samples early HDS installations of
variable density thinning in the Soleduck ranger district, comparing CWD
invertebrates in thinned versus unthinned plots. In addition, the project
compares CWD invertebrates in clumped versus dispersed CWD treatments at a
site in the Hood Canal ranger district. Results of this study will be used
to evaluate alternative methods of harvesting that attempt to combine
timer harvesting with the creation of late successional wildlife habitat.
Objectives:
The
general objective of this research is to evaluate the importance of
different characteristics of CWD (species, decay class, diameter, and type
of decay) for effects on the invertebrate community and to compare the CWD
invertebrate community on thinned versus unthinned plots.
The specific hypotheses of this study are:
1.
Variable density
thinning will increase the diversity of CWD inhabiting invertebrates
relative to unthinned plots,
2.
Clumped treatments
of CWD will have higher rates of invasion of wood boring beetles compared
to dispersed treatments, and
3.
Clumped
treatments of CWD will have higher densities of mites and springtails
relative to dispersed log treatments.
Project
Status:
Preliminary
results for this project have been reported in a peer-reviewed
publication, report, and 2 oral presentations.
Peer-reviewed
Publication:
Edmonds, R.L. and J.L. Marra.
1999. Decomposition of woody material: Nutrient dynamics
invertebrate/fungi relationships and management in Northwest forests. In
R.T. Meurisse, W.G. Ypsilantis, and C. Seybold, eds. Proceedings: Pacific
Northwest forest & rangeland soil organism symposium. Corvalis,
Oregon, March 17-19, 1998. USDA Forest Service, PNW Research Station, Gen.
Tech. Rpt. PNW-GTR-461.
Report:
Edmonds, R.L. and J.L. Marra.
2000. Habitat development project: pre- and post-treatment sampling
of coarse woody debris invertebrates in 50-70 year-old Douglas fir/western
hemlock stands on the Olympic Peninsula. Report to the USDA Forest
Service, PNW.
Oral Presentations:
Marra,
J.L. and R.L. Edmonds. 1997
The effects of alternative harvesting on the density of coarse woody
debris invertebrates on the Olympic Peninsula, Research Forest Managers’
Symposium, Olympic Natural Resources Center, Forks, Washington.
Edmonds,
R.L., J.L. Marra. 1998.
Decomposition of woody material, nutrient cycling and invertebrate/fungi
relationships in NW forests. Northwest fore and rangeland soil organisms
symposium, Corvallis, OR, March 17-18, 1998.
Progress Report:
The
method used to sample CWD invertebrates in this project was a Macfayden
high gradient anthropod extraction.
All samples have been extracted and all samples have bee cleaned
and sorted in preparation for identification.
Roughly 50 samples have been identified yielding almost 10,000
individuals..
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