A5031262667- Geology and Paleoclimatology Research
- Pleistocene-Era Hominins and Archaeology
- Landslides and related hazards
- Fire effects on ecosystems
- Isotope Analysis in Ecology
- Geological formations and processes
- Tree-ring climate responses
- Ecology and Vegetation Dynamics Studies
- Evolution and Paleontology Studies
- Rangeland and Wildlife Management
- Soil erosion and sediment transport
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Species Distribution and Climate Change
- Ecology and Conservation Studies
- Hydrology and Sediment Transport Processes
Montana State University
2010-2020
United States Geological Survey
2019-2020
University of Arizona
2020
Augsburg University
2020
Arizona Geological Survey
2019
Pavia nel Cuore
2019
Abstract A series of environmental changes from late-glacial ice recession through the early Holocene are revealed in a 7000-yr-long record pollen, charcoal, geochemistry, and stable isotopes Blacktail Pond, closed-basin lake Yellowstone National Park. Prior to 11,500 cal yr BP, cool conditions dominated, fire activity was low, alpine tundra Picea parkland grew on landscape. step-like climate change warm summer occurred at BP. In response, increased facilitating transition closed Pinus...
Abstract Aim Reconstruct the long‐term ecosystem dynamics of region across an elevational gradient as they relate to climate and local controls. In particular, we (1) describe dominant conifers' history; (2) assess changes in vegetation composition distribution; (3) note periods abrupt change versus stability means better understanding responses environmental variability. Location Greater Yellowstone Ecosystem (GYE; USA). Time period 16.5 ka bp ‐present. Major taxa studied Juniperus , Picea...
Ecological niche models predict plant responses to climate change by circumscribing species distributions within a multivariate environmental framework. Most projections based on modern bioclimatic correlations imply that high-elevation are likely be extirpated from their current ranges as result of rising growing-season temperatures in the coming decades. Paleoecological data spanning last 15,000 years Greater Yellowstone region describe response vegetation past variability and suggest...
Abstract The patterns and drivers of late Quaternary vegetation dynamics in the southeastern United States are poorly understood due to low site density, problematic chronologies, a paucity independent paleoclimate proxy records. We present well-dated (15 accelerator mass spectrometry 14 C dates) 30,000-yr record from White Pond, South Carolina that consists high-resolution analyses fossil pollen, macroscopic charcoal, Sporormiella spores, an paleotemperature reconstruction based on branched...
Abstract The Younger Dryas (YD, 12.9–11.7 ka) is the most recent, near‐global interval of abrupt climate change with rates similar to modern global warming. Understanding causes and biodiversity effects YD changes requires determining spatial fingerprints past temperature changes. Here we build pollen‐based branched glycerol dialkyl tetraether‐based reconstructions in eastern North America (ENA) better understand deglacial evolution. cooling was pronounced northeastern United States muted...
ABSTRACT Mountain ecosystems are characterized by their complex vegetation responses to past climate variability because of the interplay between large‐scale changes and local‐scale biotic abiotic conditions. This study reconstructs early postglacial expansion conifer populations in northern Greater Yellowstone Ecosystem (GYE). The objective is examine how change non‐climatic factors, including species characteristics, edaphic conditions disturbance, governed changes. Spruce expanded first...
We investigated the present effects from a 10-year-old wildfire on leaf litter breakdown rates in 3 head-water streams central Idaho. These systems experienced massive debris flow one year after fire. Based soil instability and burn patterns, we identified stream conditions; unburned, burned only, burned/scoured. placed bags containing willow leaves (Salix sp.) each type removed at various time intervals until all were collected 100 days their introduction. Leaf material was dried weighed,...