PROCEEDINGS: Index of Abstracts
MICROHABITAT EFFECTS OF LITTER TEMPERATURE AND MOISTURE
ON FOREST-FLOOR INVERTEBRATE COMMUNITIES
1-Division of Forestry, West Virginia University,
Morgantown, WV 26506. 2-National Biological Service, West Virginia
Cooperative Fish and Wildlife Research Unit, West Virginia University,
Morgantown, WV 26506.
Litter temperature and moisture may be altered due to changes in
global climate. We investigated the effect of small changes in litter
temperature and moisture on forest-floor communities in West Virginia.
We altered litter temperature and moisture in 6 x 6 m plots covered
with landscape cloth. The study sites were in six watersheds (three
north-facing and three south-facing aspects) in the Fernow Experimental
Forest and in the West Virginia University Forest from April 1992
- April 1993. We measured microbial biomass (ATP), invertebrate
density, and invertebrate composition. In covered blocks, litter
temperature increased by 0.01 EC, -2.1 EC and litter moisture increased
by 0.01 - 4.2 percent.
We identified 134 litter invertebrate species in nine orders. Overall
invertebrate density was not associated with changes in temperature
and moisture; however, both richness and evenness were associated
with changes in temperature and moisture. Density and richness of
springtails (Collembola) were higher in covered blocks, which had
higher temperature and moisture values as compared with reference
blocks. Densities of 20 invertebrate species were correlated with
changes in mean daily temperature, mean moisture, or changes in
the range of temperature and moisture. Maximum and minimum values
for both temperature and moisture increased in covered blocks, and
there were more significant associations of invertebrate density
and richness with changes in range (maximum and minimum values)
than with changes in the average temperature or moisture values.
Litter ATP decreased in covered study blocks.
Temporal (month and season) and spatial (forest, watershed, aspect,
and location on slope) variables had an effect on invertebrate density,
richness, and evenness, as well as on litter temperature and litter
moisture. Results from this study indicate that small changes in
litter temperature and moisture can effect forest-floor invertebrate