The sensitive lichen Usnea longissima Ach., formerly a fairly common circumboreal species, has been extirpated from much of its range (e.g., Eastern Europe). Although the U.S. Pacific Northwest (PNW) remains a relative stronghold for the species, U longissima faces increasing pressure in the region from habitat loss, air pollution, and...
Distribution of lichens was studied at seven coastal dune sites in
Oregon. Lichens were sampled in the dry stable, dry meadow,
meadow, rush meadow, marsh, shrub and forest deflation plain communities.
Observations were made of the standing water in the marsh
community. Quantitative measurements were made of the percent
organic...
A physio-ecological study of Lobaria pulmonaria (L. ) Hoffm.
was done to determine if geographic variation occurred within the
species. Lobaria pulmonaria was collected from Table Mountain,
Oak Creek, and Lost Prairie, located in the Coast Range, Willamette
Valley, and Cascade Range respectively in Western Oregon.
During 1971 and 1972...
Pendent Usnea species were collected in western Oregon and examined.
Character states, such as cortex-medulla-axis ratio; fibril length; papilla diameter;
branching patterns; and presence or absence of fibrils, papillae, soredia, isidia; plus
chemistry, were recorded and analyzed by inspection for differences. Historical
names were researched in the literature. A comparison...
I focus on addressing knowledge gaps relating to management of cryptogams in Oregon's public lands in Pseudotsuga menziesii-Tsuga heterophylla forests on the west side of the Cascade Range and dryland steppe in the Cascade Range's rainshadow.
While a great deal of research has illustrated the importance of late-successional forests for...
Lichens are an important part of the biota in western Oregon forests, where
they perform valuable ecological roles and contribute significantly to biodiversity.
Lichens in western Oregon are threatened by a number of factors including air
pollution and land use practices. If we wish to maintain the persistence of lichens...
I investigated the population attributes and habitat
selection of mountain beaver (Aplodontia rufa) recolonizing
clearcuts in the Coast Range mountains of Polk and Lincoln
counties, Oregon between June 1989 and August 1990. The
population characteristics of colonizing mountain beaver
were evaluated in 12 stands of 3 types: 1-year-old
clearcuts assumed...
Functional traits of vascular plants have been an important component of ecological studies for a number of years; however, in more recent times vascular plant ecologists have begun to formalize a set of key traits and universal system of trait measurement. Many recent studies hypothesize global generality of trait patterns,...
I surveyed epiphytic macrolichens and bryophytes in six stands in each of seven riparian stand types in the Oregon Coast Range. This study (Chapter 2) describes the association of epiphytes with stand types and the corresponding potential of forest canopy conversions to affect epiphyte communities. Species composition, diversity, and representation...
Associations between occupancy patterns of a montane anuran species, Rana cascadae, and habitat structure at multiple scales were examined to investigate how population structure may influence persistence in spatially and temporally heterogeneous environments. Predictions were based on population dynamics suggested by source-sink and metapopulation models. Potential sites in three basins...