Thirteen New World populations of Megachile rotundata and M. apicalis and
two Old World populations of M. rotundata were analyzed at 23 enzyme loci using
cellulose acetate electrophoresis. Conventional and G- or C-banded karyotypes were
also examined in these populations. The principal findings are (1) No differences
were found in...
Hemlock dwarf mistletoe (Arceuthobium tsugense subsp. tsugense) is an arboreal, hemiparasitic plant that principally parasitizes western hemlock (Tsuga heterophylla). Hemlock dwarf mistletoe exerts a profound influence on infected trees that can drastically change the structure of the tree crown due to reduced growth, top dieback, branch deformation and death, resulting...
This study compares the results of a contingent valuation (CV) mail survey and the voting outcome of a bond measure to fund improvements, through property tax increases, to a downtown park and adjacent riverbank in Corvallis, Oregon. In addition to asking survey respondents about their voting decision, respondents are presented...
The purpose of this study was to determine and explain
attitudes toward intercollegiate athletics of undergraduate
students in three academic majors attending Oregon State
University.
The attitudes of a proportionate random sample
consisting of 215 students were measured according to their
responses to thirty-two Likert scale items containing six
sub-scale...
The dynamics of stands in the mid-elevation old-growth
Douglas-fir (Pseudotsuga menziesii) forests of the central western
Oregon Cascade Range were investigated using stand structure
analysis. Trees with different growth rates were commonly present
in the same stand, which resulted often in a weak correlation
between tree diameter and age. Thus,...
Satellite Based evapotranspiration (ET) models have become a dominant means to estimate large-scale surface fluxes of water. Global and regional ET estimates are important parameters in many climate forecasts and hydrologic models. However, large scale partitioning of ET into soil evaporation, transpiration, and canopy interceptions remains largely unknown and modeled...
Phospholipids of Tenebrio molitor larvae were
separated on columns of DEAE-cellulose and silicic acid-Hyflo Super Cel. The major phosphatide components were
identified by various analytical procedures.
Phosphatidyl choline was demonstrated to be the
predominant phospholipid with a high percentage of
phosphatidyl ethanolamine. A small amount of inositol-containing
phosphatides were present....
Heterostylum robustum (Osten Sacken) is the principal parasite
of the alkali bee, Nomia melanderi Ckll., one of the most efficient
pollinators of alfalfa in the western United States.
The purpose of the study was to determine the incidence of
parasitism and to investigate the biology of H. robustum.
The fly...