In 1971 the Fish Commission of Oregon conducted a comprehensive study of the recreational use of marine food fish, shellfish, and other miscellaneous invertebrates in 16 Oregon estuaries. From March 1 through October 31, 1971, boat and shore anglers and tideflat users were interviewed for catch, effort, and origin data...
During the Pleistocene, an andesitic volcano named Mount
Mazama grew to a probable elevation of 3000 meters in south-
central Oregon. Near the end of the Pleistocene, three diverse
magma types appeared in the eruptive products associated with Mount
Mazama: l)High-alumina basaltic andesite magma associated with an
early plateau and...
"In January 1946 the Oregon State Game Commission authorized a study of Diamond Lake to determine reason for an apparent decline in the size and number of rainbow trout with the object of maintaining a maximum annual yield through proper management." (From Introduction)
Streamflow forecasts are essential to the optimal operation of
hydroelectric and irrigation reservoirs in the Pacific Northwest.
Satellite snow cover observations would aid in these streamflow forecasts
by providing snow cover data at regular time intervals. Unfortunately,
satellite capability to remotely sense mountain snow cover
conditions is indeterminate due to...
The identification and mapping of surface cover types
within Crater Lake National Park, Oregon, has been effectively
completed through the utilization of LANDSAT digital
data and NASA U-2 color infrared aerial photography. Classification
of LANDSAT data for surface cover type identification
and mapping was accomplished through use of the
Interactive...
Shortnose Sucker (Chasimistes brevirostris) and Lost River Sucker (Deltistes luxatus) are endemic to the Upper Klamath Basin of Southern Oregon and Northern California. Populations of these fishes have been dwindling since the 1960’s and both species where listed to as endangered in 1988. Poor recruitment is thought to be a...
Interactions between sediment bacteria and available phosphate
necessary for algal production in a eutrophic lake were studied.
Twenty percent of the organisms isolated solubilized phosphate forms
such as CaHPO₄, Ca₃(PO₄)₂, FePO₄, Mg₃(PO₄)₂ and Al₂(PO₄)₂.
Solubilization of phosphates occurred under conditions of aerobic
growth.
Upon quantitative analysis, some isolates were capable...
Carter Lake, a freshwater, coastal dune-margin lake,
was sampled at the beginning and end of the summer of 1986
to determine the sediment characteristics and benthic
macroinvertebrate abundance, biomass, variety, and
diversity. The distributions of major benthic habitats were
estimated by snorkeling in June and July, 1986. Water
temperature and...
The purpose of this thesis is to examine the problem of the
increasing competition between recreation and irrigation at Wallowa
Lake. Originally Wallowa Lake was an abundant source of fish for
the Indians but the advent of irrigation in the area by the early settlers eliminated the blueback salmon (oncorhynchus...