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At least 91 records · Page 5Linked to original sources
USGS2016

Effects of experimental removal of barred owls on population demography of northern spotted owls in Washington and Oregon—2015 progress report

Evidence indicates that competition with newly established barred owls ( Strix varia ) is causing rapid declines in populations of northern spotted owls ( Strix occidentalis caurina ), and that the longterm persistence of spotted owls may be in question without additional management intervention. A pilot study in California showed that lethal removal of barred owls in combination with habitat conservation may be able to slow or even reverse population declines of spotted owls at local scales, but it remains unknown whether similar results can be obtained in larger areas with different forest conditions and where barred owls are more abundant. In 2015, we implemented a before-after-controlimpact (BACI) experimental design on two study areas in Oregon and Washington with at least 20 years of pre-treatment demographic data on spotted owls to determine if removal of barred owls can improve population trends of spatially associated spotted owls. Here we provide an overview of our research accomplishments and preliminary results in Oregon and Washington in 2015.

Oregon, Washington↗
USGS2017

Effects of experimental removal of barred owls on population demography of northern spotted owls in Washington and Oregon—2016 progress report

Evidence indicates that competition with invasive barred owls ( Strix varia ) is causing rapid declines in populations of northern spotted owls ( S. occidentalis caurina ), and that the long-term persistence of spotted owls may be in question without additional management intervention. A pilot study in California showed that removal of barred owls in combination with habitat conservation may be able to slow or even reverse population declines of spotted owls at local scales, but it remains unknown whether similar results can be obtained in areas with different forest conditions and a greater density of barred owls. In 2015, we implemented a before-after-control-impact (BACI) experimental design on three study areas in Oregon and Washington with at least 20 years of pre-treatment demographic data on spotted owls to determine if removal of barred owls can improve localized population trends of spotted owls. Here, we report on research accomplishments and preliminary results from the first 21 months (March 2015–December 2016) of the planned 5-year experiment.

Oregon, Washington↗
USGS2018

Effects of experimental removal of Barred Owls on population demography of Northern Spotted Owls in Washington and Oregon—2017 progress report

Populations of Northern Spotted Owls ( Strix occidentalis caurina ; hereinafter referred to as Spotted Owl) are declining throughout this subspecies’ geographic range. Evidence indicates that competition with invading populations of Barred Owls ( S. varia ) has contributed significantly to those declines. A pilot study in California showed that localized removal of Barred Owls coupled with conservation of suitable forest conditions can slow or even reverse population declines of Spotted Owls. It remains unknown, however, whether similar results can be obtained in areas with different forest conditions, greater densities of Barred Owls, and fewer remaining Spotted Owls. During 2015–17, we initiated a before-after-control-impact (BACI) experiment at three study areas in Oregon and Washington to determine if removal of Barred Owls can improve population trends of Spotted Owls. Each study area had at least 20 years of pre-treatment demographic data on Spotted Owls, and represented different forest conditions occupied by the two owl species in the Pacific Northwest. This report describes research accomplishments and preliminary results from the first 2.5 years (March 2015–August 2017) of the planned 5-year experiment.

Oregon, Washington↗
USGS2019

Effects of experimental removal of Barred Owls on population Demography of Northern Spotted Owls in Washington and Oregon—2018 Progress Report

Populations of Northern Spotted Owls ( Strix occidentalis caurina ; herineafter referred to as Spotted Owl) have declined throughout the subspecies’ geographic range. Evidence indicates that competition with invading Barred Owls ( S. varia ) has contributed significantly to those declines. A pilot study in California showed that removal of Barred Owls coupled with conservation of suitable habitat conditions can slow or even reverse population declines of Spotted Owls. It is unknown, however, whether similar results can be obtained in areas with different forest conditions, greater densities of Barred Owls, and fewer remaining Spotted Owls. We initiated a before-after-control-impact (BACI) experiment at three study areas in Oregon and Washington to determine if removal of Barred Owls can improve population trends of Spotted Owls. This report describes research accomplishments and initial results from the first 3.5 years of the study (March 2015–August 2018).

Oregon, Washington↗
USGS1949

Progress report on the geology and ground-water hydrology of the Lower Missouri-Souris Unit; Part 1, Crosby-Mohall area, North Dakota

The Crosby-Mohall area covers about 2,700 square miles in the north- western part of North Dakota. This area is included in the 2,500,000-acre Missouri-Souris and Garrison Diversion irrigation projects,which are im portant units in the general plans for development of the water resources of the Missouri River Basin. Although the Crosby-Mohall area lies outside the drainage basin of the Missouri River, plans have been made for the irrigation of about 1,000,0)0 acres (equivalent to 1,560 square miles) of the most suitable land, with water brought by canal from the Missouri River in Montana. The studies that have been undertaken in the area by the Division of Ground Water of the United States Geological Survey form a part of the investigations which have been initiated by the Survey and several other bureaus of the Department of the Interior, especially the Bureau of Reclamation. The studies on which the present report is bas2 were made during the field seasons of 1945, 1946 and 1947, to obtain information on the occurrence, movement, quantity, and quality of the ground water. The report contains data on the several kinds of water-bearing materials, water analyses, and well logs; the records of fluctuation of water level in about 400 wells; and an inventory of 4,636 wells and test holes. Later studies for the whole of the Missouri-Souris Unit will supply additional data on ground-water levels and piezometric surfaces, more extensive information on quality of water, a complete inventory of wells, and further geologic information relating to ground-water supplies. Other work that is planned also includes the drilling of additional test holes and the analysis of water samples from representative wells throughout the area.

North Dakota↗
USGS1950

Progress report on the geology and ground-water hydrology of part of the Oahe Unit, James River Division, South Dakota

The Oahe Unit, in the James River basin in eastern South Dakota, extends for about 100 miles north and south and is 20 to 80 miles wide, having the river as its east border. The Oahe irrigation project is planned to supply water to 750,000 to 1,500,000 acres of the most suitable land within the area. The studies that have been undertaken in the Oahe area by the Ground Water Division of the U. S. Geological Survey form a part of the investigations which are being carried on by several bureaus of the Department of the Interior and other government agencies for the conservation, control and utilization of the water resources of the Missouri River Basin. The field studies on which the present report is based were made during May 1947 through November 1948 and cover about 1,890 square miles in the southern part of the Oahe area. Data were collected on the character of the surficial geological deposits, and on the occurrence, movement, quantity, and quality of the groundwater supplies. The report describes the several water-bearing formations and presents nine typical logs of deep artesian wells. The records of fluctuation of the water table in 168 wells in or near the Oahe area are listed. Tabulated inventory of 3,257 wells and springs includes information on the observation wells and on all other wells that were noted within the area examined.

South Dakota↗
USGS1950

Progress report: chemical character of surface waters in the Devils Lake Basin, North Dakota

Devils Lake in northeastern North Dakota was at one time the most popular summer resort in the state. With decline in lake level the lake has become a shallow body pf vary saline water, which scenic value and recreational appeal completely destroyed. Under the Missouri River development program, it is proposed to restore the lake level to an altitude of 1,425 feet by diversion of Missouri River water. The chemical character of the water in Devils Lake and in other surface bodies in Devils Lake Basin is determined from the analyses of 95 samples. The physical and chemical properties of lake bed deposits are also shown. Lake water in the basin vary considerable in both concentration and composition, ranging from fresh bicarbonate waters of 300 parts per million dissolved solids to sulfate waters of over 100,000 parts per million of soluble salts. Twenty-four samples indicates the chemical character of water in the Red River of the North and its tributaries. The probable concentration of dissolved solids in water of Devils Lake at altitude 1,425 feet has been estimated as ranging from 3,000 to 7,600 parts per million. Final concentration will largely depend upon the percentage of deposited salts reentering solution and the quality of the inflow water. The possible effects of lake effluents on downstream developments, with particular reference to sanitation and pollution problems, are also discussed in this report.

North Dakota↗