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Terrestrial amphibian distribution, habitat associations and downed wood temperature profiles in managed headwater forests with riparian buffers in the Oregon Coast Range

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dc.contributor.advisor Olson, Deanna
dc.contributor.advisor Puttmann, Klaus
dc.creator Kluber, Matthew R.
dc.date.accessioned 2007-07-12T22:00:41Z
dc.date.available 2007-07-12T22:00:41Z
dc.date.copyright 2007-05-30
dc.date.issued 2007-07-12T22:00:41Z
dc.identifier.uri http://hdl.handle.net/1957/5933
dc.description Graduation date: 2008
dc.description.abstract Western forests have become increasingly fragmented landscapes dominated by young stands. Given that western Oregon forests largely consist of headwater systems, there is a need to better understand how headwater forest taxa and their habitats are impacted by forest management practices. Several amphibian species associated with forested headwater systems have emerged as management concerns. Forest management strategies, such as harvests that remove only part of the canopy and retention of riparian buffer strips, may help ameliorate some of the negative effects on amphibians in managed forests. Pre-existing site conditions, such as legacy downed wood, also may play a role in buffering the impacts of silvicultural practices on terrestrial amphibians. Downed wood is an important habitat component for many amphibians, because the cool, moist microclimates of downed wood can provide refugia for terrestrial amphibians during warmer summer months. However, downed wood habitat suitability is another emerging concern as the rate of input and size of downed wood declines in managed forests. As part of the USDI Bureau of Land Managements Density Management Study, we investigated how untreated streamside buffers modify impacts of upland thinning on headwater forest terrestrial amphibians and their habitat at three sites in the Oregon Coast Range. To further assess habitat associations of these animals, we conducted a field experiment to address amphibian cover use, including downed wood, moss and coarse and fine substrates. In addition, we examined how temperature profiles inside small- and large-diameter downed wood and soil temperatures differed from ambient air temperatures. Temperatures of wood and soil were monitored at different slope positions (near streams and upslope) and overstory regimes (thinned and unthinned stands) to assess potential habitat suitability and buffering capabilities against seasonal temperature extremes for plethodontid salamanders. Our results suggest that pre-existing site conditions (e.g., amount of rocky or fine substrate) play an important role in determining the response of terrestrial amphibians to upland forest thinning. However, retention of stream buffers is important in maintaining unaltered stream and riparian conditions. Moderate thinning and preservation of vital habitat in riparian and nearby upland areas by way of variable-width buffers (15 m minimum width) may be sufficient in maintaining suitable habitat and microclimatic conditions vital to amphibian assemblages in managed headwater forests. Additionally, logs of a wide size range and soils may provide sufficient protection against thermal extremes harmful to plethodontid salamanders in thinned stands with limited overstory. However, this alone cannot support plethodontid salamanders. These salamanders require exposed areas (e.g., leaf litter, soil surface, rock faces) where much of their foraging and well as courtship occurs. Partial retention of the canopy through moderate thinning coupled with variable-width riparain buffers that may increase in width when suitable terrestrial habitat is encountered, may provide sufficient microhabitat, microclimate, and protection in maintaining terrestrial amphibian assemblages in managed headwater forests. en
dc.format.extent 1725295 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.subject amphibians en
dc.subject managed headwater forests en
dc.subject habitat en
dc.subject downed wood temperatures en
dc.subject riparian buffers en
dc.subject plethodontid salamanders en
dc.subject density management en
dc.subject.lcsh Amphibians -- Oregon, Western en
dc.subject.lcsh Amphibians -- Coast Ranges en
dc.subject.lcsh Amphibians -- Habitat -- Oregon, Western en
dc.subject.lcsh Amphibians -- Habitat -- Coast Ranges en
dc.subject.lcsh Coarse woody debris -- Oregon en
dc.subject.lcsh Coarse woody debris -- Coast Ranges en
dc.subject.lcsh Salamanders -- Oregon, Western en
dc.subject.lcsh Salamanders -- Coast Ranges en
dc.subject.lcsh Salamanders -- Habitat -- Oregon, Western en
dc.subject.lcsh Salamanders -- Habitat -- Coast Ranges en
dc.subject.lcsh Forest microclimatology -- Oregon, Western en
dc.subject.lcsh Forest microclimatology -- Coast Ranges en
dc.subject.lcsh Buffer zones (Ecosystem management) -- Oregon, Western en
dc.subject.lcsh Buffer zones (Ecosystem management) -- Coast Ranges en
dc.subject.lcsh Amphibians -- Effect of forest management on -- Oregon, Western en
dc.subject.lcsh Amphibians -- Effect of forest management on -- Coast Ranges en
dc.title Terrestrial amphibian distribution, habitat associations and downed wood temperature profiles in managed headwater forests with riparian buffers in the Oregon Coast Range en
dc.type Thesis en
dc.degree.name Master of Science (M.S.) in Forest Science en
dc.degree.level Master's en
dc.degree.discipline Forestry en
dc.degree.grantor Oregon State University en
dc.contributor.committeemember Beatty, Joseph
dc.contributor.committeemember Gregory, Stanley


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