Skip to main content
Advanced Search

Filters: Types: ScienceBase Citation (X)

164 results (55ms)   

View Results as: JSON ATOM CSV
In a survey study conducted to obtain base-line data, eleven extensive float trips were made down the Colorado River in the period from September 1970 through mid-June 1976. Samples of fish, mammals, plants and herpetofauna were collected; species collected are listed. In addition, terrestrial surveys were made at various land sites in the region. Major results of this survey were the lack of success in obtaining a speciman of the humpback sucker, xyrauchen texanus, and the discovery of the relative scarcity of chubs of the genus Gila. Both of these outcomes have been tied to the low water temperatures caused by releases from the Grand Canyon Dam, as well as to the barrier that the dam presents to upstream movement...
Intensive non-native removal efforts from PNM Weir to Hogback Diversion (RM 166.6 – 159.0) continued for the third consecutive year in 2003. These efforts initially began to assess efficacy of mechanical removal as an efficient method of decreasing the distribution and abundance of non-native fishes, with emphasis on channel catfish and common carp. These efforts have been recognized as a Recovery Action by the San Juan River Recovery Implementation Program (SJRIP).
Growing international concern about the greenhouse effect has led to increased interest in the regional implications of changes in temperature and precipitation patterns for a wide range of societal and natural systems, including agriculture, seal level, biodiversity, and water resources. The accumulation of greenhouse gases in the atmosphere due to human activities are likely to have siginificant, though still poorly understood, impacts on water quality and availability. One method developed over the last several years for determining how regional water resources might be affected by climatic change is to develop scienarios of changes in temperature and precipitation and to use hydrologic simulation models to study...
thumbnail
The purpose of this study was to obtain baseline data about small mammal prey based communities on Carson National Forest, especially with regards to prey of Northern Goshawk and Mexican Spotted Owl. Published in Final Report submitted to Carson National Forest, Taos, New Mexico, on pages 48 - 48, in 2003.
The Colorado River cutthroat trout (Oncorhynchus clarkii pleuriticus) was once distributed throughout the colder waters of the Colorado River basin above the Grand Canyon. About 8 percent of its historical range is occupied by unhybridized or ecologically significant populations. It has been petitioned for listing under the Endangered Species Act and is accorded special status by several state and federal agencies. Habitat alteration and nonnative trout invasions led to the extirpation of many populations and impede restoration. Habitat fragmentation exacerbated by climate change is an emerging threat. A strategic, systematic approach to future conservation is likely to be the most successful.
thumbnail
Study on the cattle industry in Canyonlands National Park. The intention of the study is to trace the history of the cattle industry as it was done in the park. The study is divided into three sections: 1) discussion of the open range cattle industry in the last decades of the 19th century 2) a look at the park itself, the topography, Colorado and Green Rivers and 3) a look at the land in the park located between the rivers, Island in the Sky and White Rim country. Published by Historic Preservation Team, Denver Service Center, National Park Service, U.S. Dept. of the Interior, in 1972.
thumbnail
The effect of campgrounds on small mammals in Canyonlands and Arches National Parks, Utah : final report, credited to Workman, Gar W, published in 1977. Published by Dept. of Wildlife Science, Utah State University, in 1977.
In September of 2004 Dexter staff responded to a request for proposals from the Bureau of Reclamation on behalf of the San Juan Recovery Implementation Program to rear and deliver 20,000 -200+ mm razorback sucker to existing grow-out ponds located on the Navajo Indian Irrigation Project (NAPI), near Farmington , NM. The fish would then be grown out for six months to a year in the NAPI ponds to reach the target size of 300+ mm in length before being released into the wild. The stockings would help the SJRIP meet its augmentation goals for the species in the San Juan River as described in addendum to The Five-Year Augmentation Plan For Razorbacks Sucker In The San Juan(Feb 2003).
Activities of the Upper Colorado River Endangered Fish Recovery Program (Recovery Program) include habitat improvement and management (e.g., restoration of flooded bottomlands, provision of fish passage) and flow management to provide suitable habitat conditions for the four species of endangered fishes in the Upper Colorado River Basin — Colorado pikeminnow (Ptychocheilus lucius), humpback chub (Gila cypha), bonytail (Gila elegans), and razorback sucker (Xyrauchen texanus). In this report, we identify and apply an approach for prioritizing river reaches and habitats for geomorphic research in the Upper Colorado River Basin. The goal of this project was to identify priorities for geomorphology research in endangered...
Invasion by the C3 annual grass Bromus tectorum has significantly increased the amount of relatively low quality (high lignin:nitrogen) plant litter deposited in arid Colorado Plateau grasslands. Our objectives were to determine what effects these changes have on microbial utilization of carbon (C) and nitrogen (N). We measured net C and N mineralization, and the δ13C of bulk organic matter, mineralized C, and bacterial fatty acids from soils of invaded and non-invaded C3 (Stipa hymenoides) and C4 (Hilaria jamesii) native grasslands. Carbon mineralization was greater in invaded compared to non-invaded sites (1.25 +/- 0.09 and 1.52 +/- 0.18 g CO2-C kg-1 soil h-1 respectively). Rates of net inorganic N mineralization...
MOAB, Utah — Drier conditions projected to result from climate change in the Southwest will likely reduce perennial vegetation cover and result in increased dust storm activity in the future, according to a new study by scientists with the U.S. Geological Survey and the University of California, Los Angeles. The research team examined climate, vegetation and soil measurements collected over a 20-year period in Arches and Canyonlands National Parks in southeastern Utah. Long-term data indicated that perennial vegetation in grasslands and some shrublands declined with temperature increases. The study then used these soil and vegetation measurements in a model to project future wind erosion. The findings strongly...
Soil aggregates are groups of soil particles that are bound to each other more strongly than to adjacent particles. Organic matter “glues� produced when soil biota break down dead roots and litter hold the particles together. Threadlike strands of fungi also bind particles into aggregates. Microscopic aggregates are the building blocks of larger aggregates. The larger aggregates and the arrangement of them, along with chemical attraction between particles, determine soil structure. The structure of the surface layer commonly is granular or blocky, but a degraded surface layer can be crusted, platy, or structureless. Pores important for the movement of air, water, and plant nutrients occur within and between...
Downscaled data is being provided to us from OCCRI to model changes in temperature and salinity within Oregon estuaries. IN 2010 OCCRI developed a code framework to allow climate data from the North American Regional Climate Change Assessment Program (NARCCAP) to be applied to the study of estuaries in the Pacific Northwest. The NARCCAP project provides high resolution (50 km grid cells; 3 hourly or daily timestep) climate data using state of the art global and regional climate models. The NARCCAP domain covers most of the continent of North America. Both “reference� (i.e. historical) and future data sets are available. Data is served from the NARCCAP web site in the form of netCDF files. The code developed...
Hydrology, geomorphology and habitat studies of the San Juan River began in 1992 as a part of the San Juan River Basin Recovery Implementation Program (SJRIP). The activities changed from research to monitoring beginning in 1999. Geomorphology monitoring changed in 2005 at the direction of the SJRIP Biology Committee. River cross-section measurement changed from pre- and post-runoff to post-runoff every 5 years with the next measurements in 2009. In 2005, two detailed reach studies were initiated. The reaches were selected and first surveyed in 2005. In 2007, Colorado pikeminnow surveys in the two detailed reaches were added. This report summarizes data collected in 2007 as a part of the long-term monitoring program...
Concern over the greenhouse effect has led to increased interest in the regional implications of changes in temperature and precipitation patterns for water resources. The impact of greenhouse gases on water availability and quality is likely to be significant, though still poorly understood. Both the development of scenarios involving temperature and precipitation variation and the use of hydrologic simulation models allows researchers to study the impact of these changes on runoff and water supply.
thumbnail
The structural stabilization of seven prehistoric ruins in Canyonlands National Park and Natural Bridges National Monument, credited to Gaunt, Joan K, published in 1985.
thumbnail
Canyonlands National Park has an excellent interpretation and education program. Visitors enjoy quality services that meet diverse needs and promote sustainable experiences. In order to maintain and even increase this high level of quality, a variety of actions are recommended over the next 5-10 years. Chief among them are: • Expand and renovate the Island in the Sky Visitor Center • Explore options for additional visitor amenities at Island in the Sky • Improve services for "windshield visitors" (those staying for just a few hours) in the Needles District; this includes front-end research • Reduce the numbers of different signs at trailheads; improve appearance and effectiveness of signs • Install new wayside exhibits...
Executive Summary: In this project, we are working to advance efforts to understand and accommodate model uncertainty by applying to Missouri River sturgeon population dynamics the tools of multi-scale climate models and hierarchical Bayesian modeling frameworks, linking models for system components together by formal rules of probability. The goal is to evaluate the potential distributional changes in an ecological system, given distributional changes implied by a series of linked climate and system models under various emissions/use scenarios for evaluation of management options for coping with global change consequences and a powerful tool for assessing uncertainty of those evaluations. As such, we are combining...
The San Juan River is historic habitat for seven native fish species including three rare fish species: the Colorado pikeminnow (Ptychocheilus lucius), razorback sucker (Xyrauchen texanus), and roundtail chub (Gila robusta). Jeopardy opinions issued by the U. S. Fish and Wildlife Service (Service) during consultations on the Animas-La Plata (ALP) and Navajo Indian Irrigation Projects (NIIP) under Section 7 of the Endangered Species Act led to the initiation of a seven-year research period on the fish community of the San Juan River, beginning in 1991. The goal of this research period was to study the effects of test flows from Navajo Reservoir (upstream of Farmington, New Mexico {NM}) on the fish community and instream...
Soil biota, the biologically active powerhouse of soil, include an incredible diversity of organisms. Tons of soil biota, including micro-organisms (bacteria, fungi, and algae) and soil “animals� (protozoa, nematodes, mites, springtails, spiders, insects, and earthworms), can live in an acre of soil and are more diverse than the community of plants and animals above ground. Soil biota are concentrated in plant litter, the upper few inches of soil, and along roots. Soil organisms interact with one another, with plant roots, and with their environment, forming the soil food web.


map background search result map search result map Canyonlands Long-Range Interpretive Plan The effect of campgrounds on small mammals in Canyonlands and Arches National Parks, Utah : final report The structural stabilization of seven prehistoric ruins in Canyonlands National Park and Natural Bridges National Monument Cattle raising in the canyons: Canyonlands National Park, Utah Baseline inventory of small mammal prey-base communities on Carson National Forest, New Mexico Canyonlands Long-Range Interpretive Plan Cattle raising in the canyons: Canyonlands National Park, Utah The structural stabilization of seven prehistoric ruins in Canyonlands National Park and Natural Bridges National Monument The effect of campgrounds on small mammals in Canyonlands and Arches National Parks, Utah : final report Baseline inventory of small mammal prey-base communities on Carson National Forest, New Mexico