A5015417699- Tree-ring climate responses
- Hydrology and Sediment Transport Processes
- Plant Water Relations and Carbon Dynamics
- Hydrology and Watershed Management Studies
- Climate variability and models
- Climate change and permafrost
- Soil erosion and sediment transport
- Fire effects on ecosystems
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Environmental and Agricultural Sciences
- Historical Studies on Spain
- Forest, Soil, and Plant Ecology in China
- Fish Ecology and Management Studies
- Forest ecology and management
- Ecology and Vegetation Dynamics Studies
- Mediterranean and Iberian flora and fauna
- Medieval and Early Modern Iberia
- Archaeology and Natural History
- Wildlife-Road Interactions and Conservation
- Forest Ecology and Biodiversity Studies
- Historical Art and Architecture Studies
University of Arizona
2021-2024
University of Idaho
2024
Colorado State University
2022
Royal Society for the Protection of Birds
1990-1991
In view of the 25% loss native pine woodland in Scotland during period 1950 to 1986, bird communities breeding Scots Pine (Pinus sylvestris) forest at Abernethy, Scotland, are described from species densities estimated by point count methods and individual were compared across gradients habitat identified ordination techniques. Thirty-five recorded with a total density 29.9 individuals ha -1 which 8 species, Goldcrest, Chaffinch, Spotted Flycatcher, Coal Tit, Crested Siskin, Treecreeper...
Abstract Sediment eroded from the headwaters of a large basin strongly influences channels and ecosystems far downstream, but connection is often difficult to trace. Disturbance‐dependent riparian trees are thought rely primarily on floods for formation sand bars necessary seedling establishment, pulses sediment should also promote such features. In order expand understanding role connectivity in governing ecological processes, here we explore hypothesis that cottonwood forest along Green...
Abstract Regional warming and associated changes in hydrologic systems pose challenges to water supply management river basins of the western United States call for improved understanding spatial temporal variability runoff. We apply a network total width, subannual delta blue intensity tree-ring chronologies combination with monthly balance model identify droughts their precipitation P temperature T footprints Truckee–Carson River basin (TCRB). Stepwise regression gave reasonably accurate...
Abstract Contextualizing current increases in Northern Hemisphere temperatures is precluded by the short instrumental record of past ca. 120 years and dearth temperature-sensitive proxy records, particularly at lower latitudes south <50 °N. We develop a network 29 blue intensity chronologies derived from tree rings Tsuga canadensis (L.) Carrière Picea rubens Sarg. trees distributed across Mid-Atlantic Northeast USA (MANE)—a region underrepresented multi-centennial temperature records. use...
Abstract Riparian trees and their annual growth rings can be used to reconstruct drought histories related streamflow. Because the death of individual reduces competition for survivors, however, tree‐ring chronologies based only on surviving may underestimate impacts. This problem addressed by calculating productivity at stand scale account tree mortality establishment. In semi‐arid Great Basin in western United States, we calculated riparian wood production from 1946 2016 along a stream...
Abstract Key Message Wood fiber cell wall thickness best characterizes white bands found at the end of certain growth rings in Salix alba. Evidence suggests these features are related to late-season hydrology. Recent, record-breaking discharge Yenisei River, Siberia, is part a larger trend increasing river flow Arctic driven by Amplification. These changes magnitude and timing can lead increased risk extreme flood events, with implications for infrastructure, ecosystems, climate. To better...
Abstract Five popular footpaths which grew wider from the 1960s to early mid‐1980s were re‐measured in July 1990. Two did not widen further during 1986–90, but two continued widen. The fifth path had changed significantly overall width since 1982, slightly less bare ground than formerly. paths stopped widening are at lower and more sheltered locations, whereas other three high exposed an extreme climate, where plant growth is very slow. Changes five discussed relation human use of area. A...
First posted August 31, 2020 For additional information, contact: Director, Fort Collins Science CenterU.S. Geological Survey2150 Centre Avenue, Bldg. CFort Collins, CO 80526 We assessed the history of flow and riparian ecosystem change along Wind River using cottonwood tree-ring data, streamgage records, historical temperature precipitation drought indices, local observations Traditional Ecological Knowledge from elders Eastern Shoshone Northern Arapaho Tribes Reservation, Wyoming. This...
Abstract The Yenisei River is the largest contributor of freshwater and energy fluxes among all rivers draining to Arctic Ocean. Modeling long-term variability Eurasian runoff Ocean complicated by considerable river discharge in time space, monitoring constraints imposed a sparse gauged-flow network paucity satellite data. We quantify tree growth response at upper reaches Tuva, South Siberia. Two regression models built from eight tree-ring width chronologies Larix sibirica are applied...
<title>Abstract</title> Contextualizing current increases in Northern Hemisphere temperatures is precluded by the short instrumental record of past ca. 120 years and dearth temperature-sensitive proxy records, particularly at lower latitudes south <50 °N. We develop a network 29 blue intensity chronologies derived from tree rings Tsuga canadensis (L.) Carrière Picea rubens Sarg. trees distributed across Mid-Atlantic Northeast USA (MANE)---a region underrepresented multi-centennial...
Abstract Hydrologic stress is increasing in Fremont cottonwood ( Populus fremontii ) forests across the southwestern United States because of increased temperature and streamflow diversion. The spatial variability this large yet poorly understood. Along Yampa Green Rivers Colorado Utah, vapour pressure deficit flow diversions increase downstream. To investigate effects gradient on cottonwoods, we measured percent live canopy height randomly selected trees at three sites: Deerlodge Park River...
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]Increased winter runoff in Siberia modeled with tree rings as evidence for recent high rate of permafrost degradationAuthorsIrina PPanyushkinaiDDavid MMekoAlexander IShiklomanoviDRichard DouglasThaxtoniDSee all authors Irina P PanyushkinaiDCorresponding Author• Submitting AuthorUniversity ArizonaiDhttps://orcid.org/0000-0001-8854-2637view email addressThe was not providedcopy addressDavid...
Earth and Space Science Open Archive Presented WorkOpen AccessYou are viewing the latest version by default [v1]Modeling Seasonality of River Discharge in Pan-Arctic Watersheds with Ring Width Tracheid Anatomical ParametersAuthorsIrina PPanyushkinaiDRichard DouglasThaxtoniDDavid MMekoiDSee all authors Irina P PanyushkinaiDCorresponding Author• Submitting AuthorUniversity ArizonaiDhttps://orcid.org/0000-0001-8854-2637view email addressThe was not providedcopy addressRichard Douglas...
Earth and Space Science Open Archive Presented WorkOpen AccessYou are viewing the latest version by default [v1]The potential for quantitative wood anatomy of dryland riparian trees to improve understanding historic water availability in USA SouthwestAuthorsRichardThaxtoniDDavidMekoSee all authors Richard ThaxtoniDCorresponding Author• Submitting AuthorUniversity ArizonaiDhttps://orcid.org/0000-0002-8027-4567view email addressThe was not providedcopy addressDavid MekoUniversity Arizonaview address
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]How Do Wood Anatomical Traits in Salix Vary Response to Flooding? A Case Study from Yenisei River, SiberiaAuthorsRichardThaxtoniDDavidMekoIrinaPanyushkinaiDGeorgvon ArxiDSee all authors Richard ThaxtoniDCorresponding Author• Submitting AuthorUniversity of ArizonaiDhttps://orcid.org/0000-0002-8027-4567view email addressThe was not providedcopy addressDavid MekoUniversity Arizonaview...
Earth and Space Science Open Archive This is a preprint has not been peer reviewed. ESSOAr venue for early communication or feedback before review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]QUANTIFYING TERMINAL WHITE BANDS IN SALIX FROM THE YENISEI RIVER, SIBERIA AND THEIR RELATIONSHIP TO LATE-SEASON FLOODINGAuthorsRichardThaxtoniDDavidMekoIrinaPanyushkinaiDGeorgvon ArxiDLeonidAgafonoviDSee all authors Richard...