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Seed gennination of Atriplex confertifolia (shadscale) has been studied sporadically since 1900, with little progress in understanding the mechanisms responsible for seed donnancy or in overcoming these obstacles for the purpose of successfully seeding shadscale in restoration projects. Most work has concentrated on the indurated bracteoles and their role in inhibiting gennination, but no conclusive evidence has been presented to show that the bracts must disintegrate to allow germination. Experiments show that moist chilling offresh seeds for 12 weeks allowed gennination of up to 66 percent offresh fruits and up to 85 percent of 3 year old fruits. No gennination occurred in unchilled fruit. A preliminary trial...
Seasonal Changes in Productivity in the Copper River Plume and Coastal Gulf of Alaska, credited to Schroth, A.W., published in 2011. Published in Alaska Marine Science Symposium, in 2011.
Second Sea Level Rise Modelling Workshop, credited to Reusser, D.A., published in 2011. Published in Second Sea Level Rise Modelling Workshop, Feb 1 - 2, in 2011.
This paper briefly reviews the distribution, taxonomy and population status of the southwestern willow flycatcher then follows with a survey of problems and threats faced by fragmented flycatcher populations in the Southwest. It concludes with a summary of potential actions that various stakeholders, including private citizens, can take to benefit the flycatcher and can also take important strides in conserving and recovering riparian ecosystems. Published in Transactions of the 64th North American Wildlife and Natural Resource Conference, on pages 275 - 291, in 1999.
Partitioning of zinc (Zn) between dissolved and colloidal phases was studied in the upper Animas River. Most of the Zn was dissolved in the water column, but a variable fraction of the total Zn was associated with aluminum (Al)- and iron (Fe)-rich colloidal particles. Colloids were supplied to the river by tributary creeks that drain areas with natural sulfide mineral deposits and debris from abandoned mines. The fraction of the total Zn that was in the colloidal phase increased with pH in the river, indicating the possibility of adsorption by colloidal Al and Fe. The influence of pH was confirmed in laboratory experiments in which larger fractions of the total Zn were associated with the colloids when pH was increased...
The DeBeque Canyon landslide is located 34 km east of Grand Junction. The Colorado River formed the canyon by eroding into a plateau of gently dipping Mesa Verde Group Formation. Interstate 70 follows the river and crosses the landslide toe on the south floor of the canyon. The historical record of this landslide dates to the late 1800s. Catastrophic movements occurred at the turn of the century when the slide toe entered the Colorado River, damaged the railroad and flooded structures on the opposite bank. In 1958, the landslide toe heaved the highway 7.3 m during a road-widening project. Another major re-activation in 1998, heaved the roadway 4.3 m vertically and 3 m laterally, badly damaging the Interstate. In...
Beaver populations have declined dramatically in Rocky Mountain National Park since 1940. Declines were initiated by trapping in 1941 - 1949. Blood tests of 39 livetrapped beaver indicated disease is not present in the population. Current beaver populations occur in areas with low willow use by elk. We compared use of woody stems in a winter food cache with nearby unused stems and found that beaver selected stems that had a lower percentage of leaders browsed by elk. We experimentally tested the effects of elk browsing on regrowth of simulated beaver-cut willow inside and outside 5 elk exclosures and found intense elk browsing produced plants of low vigor that were small, short, and hedged with a high percentage...
A Data-Assimilative Modeling System for the Gulf of Alaska based on the Regional Ocean Modeling System (ROMS), credited to Wang, X, published in 2010. Published in Fall Meeting, AGU, San Francisco, CA, in 2010.
Limited published information is available on the relationships between hydrology and vegetation in montane and subalpine wetlands of the central and southern Rocky Mountains. This paper addresses hydrology and vege�tation of these wetlands and cites two recent research projects related to this topic. It also suggests the considerations in predicting impacts for wetland systems. Published in Wetland and Riparian Ecosystems of the American West: Proceedings of the Eight Annual Meeting of the Society of Wetland Scientists, on pages 81 - 84, in 1987.
Thispaper compares the functional values of existing natural and constructedwetlands with the wetlands that will be filled during constructionof the proposed Legacy Highway near Salt Lake City, Utah.Wetland impact along the proposed highway alignment is the mostimportant issue considered in the project Environmental Impact Statement (EIS).This paper proposes a reconnaissance level method by which theLegacy wetlands were compared with six other wetlands, namely, theSalt Lake City wastewater treatment plant wetland (WWTP), Airport andKennecott mitigation wetlands, Farmington Bay, Murray City Jordan River Parkwaywetland and a high elevation natural wetland. Relative ratings forthe functional values for each wetland...
The watershed of the upper Animas River in the San Juan Mountains of Colorado was the site of extensive mining and ore milling during the late 19th and early 20th centuries. Using geologic mapping, stratigraphic and sedimentological studies of floodplain sediments, geochronology, historical records, and geochemical analysis of sediments, we conclude the following. Prior to mining, the river valley below the town and ore mill site of Eureka was composed of small, multi-thread, gravel bedded channels. These were located within a silty floodplain consisting of willow thickets and possibly intermittent and localized beaver ponds. A radical change in the stream and floodplain environment started sometime around the turn...
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Telluride is located in San Miguel County in the southwestern part of Colorado's Rocky Mountain region (Figure 1). San Miguel County is bordered on the north by Montrose County, on the east by Ouray and San Miguel Counties, on the south by Dolores County, and on the west by the state of Utah. Published in Restoration, Creation and Management of Wetland and Riparian Ecosystems in the American West: Proceedings of a Symposium of the Rocky Mountain Chapter of the Society of Wetland Scientists, on pages 102 - 108, in 1988.
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Irrigationimpoundments, canals, drainage ditches, irrigated fields, and the incidental wetlandscreated by irrigation and drainage, provide valuable habitat for birdsin and around Delta, Utah. Documentation of the creation ofthese areas and observations of bird use from 1995?2004 duringmigration, breeding, and wintering are reported. 147 species of birdswere observed using incidentally created habitat sites. �2004 ASCE Published by ASCE, in 2004.
Categories: Publication; Types: Citation, Conference Citation; Tags: ASCE
Climate change in the Crown of the Continent Ecosystem: Implications for fisheries, credited to Muhlfeld, C., published in 2010. Published in International Crown Managers Partnership Forum, Fernie, British Columbia, Canada. 14 April 2010, in 2010.
Assessing ecosystem vulnerability to climate change in the Pacific Northwest, credited to Langdon, J., published in 2010. Published in DOI Conference on the Environment, Portland, Oregon, April 26-30, in 2010.
Potential impacts of climate change on aquatic ecosystems fin the Crown of the Continent: Implications for conservation and management of native species and habitats, credited to Muhlfeld, C., published in 2010.
Development of hydrodynamic models for evaluating climate change and ecosystem landscape effects in Southern Florida, USA, credited to DeAngelis, D, published in 2010. Published in USGS Climate Change Science: Understanding the Past, Informing Decisions for the Future, Denver CO March 9-11, in 2010.
The Bureau of Land Management in Colorado evaluated abundance and diversity of plant, bird and small mammal popu­lations in three study areas each with different grazing management practices. Significant differences in both abundance and diversity of each species was shown in the representative grazing sites. Published in Lowland river and stream habitat in Colorado: A Symposium. Colorado Chapter, the Wildlife Society and Colorado Audubon Council, on pages 100 - 113, in 1978.
The geochemistry of rare earth element (REE) variations in acid waters is being studied as part of the U. S. Geological Survey Abandoned Mine Lands Initiative in two pilot watersheds, upper Animas, Colorado and Boulder, Montana. The following objectives are under investigation: (1) comparison of acid mine waters and naturally acidic springs, (2) determination of whether the dominant control on REEs in acid waters is source-related or post-dissolution process-related, (3) determination of the role of iron and aluminum colloid formation on the REE patterns, (4) address the utility of REE geochemistry in acid waters as an analogue for the actinides, and (5) produce a Standard Reference Water Sample for REEs. Results...
Scientists participating in the USGS Abandoned Minelands Initiative have quantified metal concentrations and loadings from mining-related and natural background sources in the upper Animas River of southwestern Colorado, with the goal of guiding remediation decisions by federal land- management agencies. We have compared site-specific toxicity thresholds with frequencies of dissolved metal concentrations in stream water to evaluate the contributions of zinc and copper to toxic effects in fish and aquatic invertebrates in the upper Animas. Median lethal concentrations (LC50s) of zinc and copper were determined for fathead minnows, Pimephales promelas, and amphipods, Hyalella azteca, from seven-day toxicity tests...
map background search result map search result map Riparian wetland enhancement in the San Miguel River Valley Telluride, CO Bird Use of Habitat Created by Irrigation and Drainage Practices in the Delta, Utah Area Riparian wetland enhancement in the San Miguel River Valley Telluride, CO Bird Use of Habitat Created by Irrigation and Drainage Practices in the Delta, Utah Area