A5023038113- Hydrology and Sediment Transport Processes
- Hydrology and Watershed Management Studies
- Fish Ecology and Management Studies
- Soil erosion and sediment transport
- Freshwater macroinvertebrate diversity and ecology
- Archaeology and Natural History
- Rangeland and Wildlife Management
- Aquatic Invertebrate Ecology and Behavior
- Botany, Ecology, and Taxonomy Studies
- Ecology and Vegetation Dynamics Studies
- Geology and Paleoclimatology Research
- Species Distribution and Climate Change
- Organ Donation and Transplantation
- Fire effects on ecosystems
- Organ Transplantation Techniques and Outcomes
- Ecology and biodiversity studies
- Karst Systems and Hydrogeology
- Parathyroid Disorders and Treatments
- Plant and animal studies
- Botany and Plant Ecology Studies
- Renal Transplantation Outcomes and Treatments
- Marine and environmental studies
- Plant Water Relations and Carbon Dynamics
- Wildlife Ecology and Conservation
- Renal and Vascular Pathologies
Flagstaff Medical Center
2001-2024
Museum Of Northern Arizona
2009-2022
University of Arizona
2019
Southwest Center for Educational Excellence
2019
United States Geological Survey
1994-2016
Astrogeology Science Center
2016
Menlo School
2016
National Park Service
2016
Ecological Consulting (Czechia)
2000
Crow Canyon Archaeological Center
1998-1999
In this overview (introductory article to a special issue including 14 papers), we consider all main types of natural and artificial inland freshwater habitas (fwh). For each type, identify the biodiversity patterns ecological features, human impacts on system environmental issues, discuss ways use information improve stewardship. Examples selected key biodiversity/ecological features (habitat type): narrow endemics, sensitive (groundwater GDEs); crenobionts, LIHRes (springs); unidirectional...
estoration of riverine ecosystems is often stated as a management objective for regulated rivers, and floods are one the most effective tools accomplishing restoration.The National Research Council (NRC 1992) argued that ecological restoration means returning "an ecosystem to close approximation its condition prior disturbance" "restoring altered, damaged, Of destroyed lakes, wetlands high-priority task."Effective must be based on clear definition value resources society; scientific studies...
• I developed a method for scoring the severity of septic process, based on deteriorated functions in seven key organ systems body. The system is numeric and recognizes that risk to patient rises geometrically as organ-system deteriorate step by step. was validated reviewing clinical course 30 patients with sepsis. Prognosis hospital stay correlated well individual scores. offered more accurate comparisons studies infected helped follow up sepsis accurately. (<i>Arch Surg</i>1983;118:1190-1192)
Walters, C. J., J. Korman, L. E. Stevens and B. Gold 2000. Ecosystem Modeling for Evaluation of Adaptive Management Policies in the Grand Canyon. Conservation Ecology 4(2):1. https://doi.org/10.5751/ES-00222-040201
The serial discontinuity concept (SDC; Ward and Stanford, in Ecology of River Systems, 1983) predicts that recovery large regulated rivers over distance downstream from a dam is limited by relative tributary size; however, channel geomorphology may also influence the process. We examined spatial variation water quality, benthic composition ash-free dry standing biomass (AFDM) among bedrock-defined geomorphological reaches three turbidity segments Colorado between Glen Canyon Dam Diamond...
A sequence of flood deposits left by the Colorado River in Grand Canyon, Arizona, provides evidence at least 15 floods with peak discharges greater than $$5500 m^{3}sec^{-1}$$ over last 4500 yr. Ten during 2000-2300 yr had $$6800 m^{3}sec^{-1}$$. One flood, 1600-1200 ago, a discharge exceeding $$14,000 m^{3}sec{-1}$$, flow rate more twice largest gaged flood. This record flooding is one longest for major U.S. river, and, combined twentieth century floods, allows determination frequency and...
New, productive fluvial marshes may develop along regulated canyon rivers through reduction in flood frequency, thereby increasing diversity, production, and wildlife habitat availability. Few occurred the eddy‐dominated Colorado River Grand Canyon prior to construction of Glen Dam 1963. Reduction flooding after 1963 permitted widespread marsh development. Fluvial exhibited low stability but high resilience, quickly redeveloping scouring by flows between 1983 1986. In 1991, 253 wet...
We used five in situ experiments to test the influence of fluctuations river discharge on structure and function tailwaters benthos associated with cobble substrata Colorado River downstream from Glen Canyon Dam, Arizona, USA. Periods daily desiccation freezing during fluctuation significantly limited community biomass energy. The permanently submerged channel supported 4-fold higher macroinvertebrate mass than varial zone. Daily harvests showed a 50% reduction Cladophora glomerata after 2 d...
The 1996 controlled flood released from Glen Canyon Dam into the Colorado River was a small magnitude, short duration event compared to pre-dam floods. of lesser magnitude than 1.25-yr recurrence, and only 10% spring snowmelt floods during period 1922–1962 were lower magnitude. occurred unusually early: 36–38 d prior any previous annual since 1922. stage difference between flood's peak recessional baseflow smaller in those years similar or volume. However, large perspective post-dam regime....
Regulated river restoration through planned flooding involves trade-offs between aquatic and terrestrial components, relict pre-dam novel post-dam resources processes, management of individual ecosystem characteristics. We review the (wetland riparian) impacts a 1274 m3/s test flood conducted by U.S. Bureau Reclamation in March/April 1996, which was designed to improve understanding sediment transport downstream from Glen Canyon Dam Colorado River ecosystem. The successfully restored...
e15503 Background: SCAC is a rare malignancy, representing < 1% of all cancer diagnoses annually, with suboptimal survival outcomes in advanced or metastatic stages. Carboplatin + paclitaxel the current standard first-line (1L) therapy for SCAC, and there emerging evidence indicating efficacy immune checkpoint inhibitors (ICIs) this setting, including recent phase 3 PODIUM303/InterAACT 2 trial that demonstrated significant benefit adding retifanlimab to chemotherapy (Rao S, et al. Ann...
The administration of synthetic peptide S42 leads to suppression and reversal experimental allergic encephalomyelitis (EAE) induced in guinea pigs by myelin basic protein. Peptide contains a linear sequence 21 amino acid residues, H-Phe-Ser-Trp-Gln-Lys-Phe-Ser-Trp-Gln-Lys-Phe-Ser-Trp-Gln-Lys-Phe-Ser-Trp-Gln-Lys-Gly-OH, made up four repeating unit sequences H-Phe-Ser-Trp-Gln-Lys-OH addition C-terminal glycine. Injected at relatively high doses, is non-encephalitogenic. It induces delayed-type...