Article
Geochemistry & Geophysics
K. D. Gray, D. A. Foster, K. Johnson, V. H. Isakson
Summary: Reviewing the paleomagnetic data along a transect of 800 kilometers, it was found that adjacent crustal blocks underwent clockwise rotation relative to North America, and the formation of the strata was consistent with the paleomagnetic data.
Article
Forestry
Nickolas E. Kichas, Amy M. Trowbridge, Kenneth F. Raffa, Shealyn C. Malone, Sharon M. Hood, Richard G. Everett, David B. McWethy, Gregory T. Pederson
Summary: The study found no trade-off between tree growth and defense in whitebark and lodgepole pine, with differences in resin ducts and resin chemistry between the two species. Based on constitutive terpene profiles, mountain pine beetles are more likely to enter lodgepole pine but more likely to successfully elicit mass attacks in whitebark pine. Overstory competition may influence tree defenses and alter bark beetle-conifer interactions as host and nonhost species migrate in response to changing climate.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Forestry
Quresh S. Latif, Jonathan G. Dudley, Matthew A. Dresser, Denise Pengeroth, Victoria A. Saab
Summary: This study found that snags formed after trees were infested by bark beetles can persist for a relatively long time, providing nesting and foraging opportunities for woodpeckers and other wildlife. The persistence of snags is influenced by environmental factors such as diameter at breast height, age, broken-top condition, topography, and tree density. This research is important for helping forest managers identify snags that are most likely to persist and provide extended habitat value for woodpeckers.
FOREST ECOLOGY AND MANAGEMENT
(2023)
Article
Forestry
James D. Johnston, Julia H. Olszewski, Becky A. Miller, Micah R. Schmidt, Michael J. Vernon, Lisa M. Ellsworth
Summary: The study found that mechanical thinning without prescribed fire in a ponderosa pine forest in Eastern Oregon resulted in a significant reduction in crown fire potential immediately following thinning, as well as a moderation in surface fire behavior starting 2-3 years post-thinning. While there was an increase in small woody surface fuel loading, other ground and surface fuels substantially declined, indicating that mechanical thinning alone can meet fuel reduction and fire risk management objectives for several years.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Geochemistry & Geophysics
Ian P. Armstrong, Brian J. Yanites, Nate Mitchell, Clarke DeLisle, Bruce J. Douglas
Summary: This study uses various methods such as channel morphometrics and cosmogenic erosion rates to investigate fault slip rates along the eastern margin of Bull Mountain in Southwest Montana. The research shows that the fault evolved from south to north, with varying slip rates along strike. The timing of fault initiation is found to be related to the migration of the Yellowstone hotspot.
Article
Paleontology
Debra L. Hanneman, Donald Lofgren, Stephen T. Hasiotis, William C. McIntosh
Summary: The translation provides detailed information on the chronostratigraphy of the Pipestone Springs strata in the upper Eocene period and its mammalian fauna. The new age constraints expand the age range of the Pipestone Springs strata and provide support for late Eocene mammalian paleogeography.
ACTA PALAEONTOLOGICA POLONICA
(2022)
Article
Forestry
Joshua J. Granger, David S. Buckley
Summary: The study found that there were no significant differences in survival rates, height growth, and basal diameter growth among different treatments for white oak, loblolly pine, shortleaf pine, and eastern white pine. However, survival rate, as well as height and basal diameter growth, were significantly higher in large-diameter white oak seedlings compared to standard seedlings. This suggests species compatibility and no net negative impact of multi-cropping white oak with the three pine species in the early stages of development.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Forestry
Robert A. Slesak, Marcella Windmuller-Campione
Summary: Biochar application did not have a significant effect on the growth of planted jack pine seedlings in sandy soil. However, manual irrigation increased water and nutrient availability, leading to improved seedling performance.
CANADIAN JOURNAL OF FOREST RESEARCH
(2023)
Article
Environmental Sciences
Christine L. Weilhoefer, Frances Turner, Cristiana N. Matteucci
Summary: This study investigated the temporal and spatial patterns of microphytobenthos (MPB) in a Pacific Northwest estuary with complex environmental gradients. The research found that MPB biomass and diatom assemblage composition varied between sites and seasons, with different relationships with environmental variables. Despite the complexity in understanding these relationships, the study suggests that tidal flat diatoms can serve as indicators of estuarine environmental conditions.
ESTUARIES AND COASTS
(2021)
Article
Biodiversity Conservation
Jennifer H. Watt, Andrea Runelle, Simon Brewer, Barbara Bentz, Jessem Morris, R. Justin DeRose
Summary: This study provides a Holocene record of vegetation change and identifies putative mountain pine beetle outbreaks through analyzing sediment cores in the Lake of the Woods, Montana. The occurrence of these outbreaks is found to be primarily driven by precipitation, and it coincides with periods when the forest composition is dominated by Pinus spp.
WESTERN NORTH AMERICAN NATURALIST
(2022)
Article
Geology
Lucas N. Weaver, Thomas S. Tobin, Jordan R. Claytor, Paige K. Wilson Deibel, William A. Clemens, Gregory P. Wilson Mantilla
Summary: The Hell Creek region in northeastern Montana provides an excellent study system to understand the rise of mammalian faunas after the K-Pg mass extinction. This research presents a new stratigraphic model and identifies five mammal-bearing sedimentary units that span the first 900 ka of the Paleocene. The study reveals that previously thought to be a single fluvial channel complex, the middle Tullock fossil localities are actually derived from two distinct sedimentary units, which complicates interpretations of their relative age.
Article
Marine & Freshwater Biology
Alicia Cordero, Barry Roth, W. Brian Simison, David R. Lindberg
Summary: Helminthoglypta genus of land snails is broadly distributed along the west coast of the USA and Mexico. Molecular studies have shown monophyletic clades among taxa in northern California and southern Oregon forests, with exceptions in mixing of species and presence of undescribed species. Accurate species identifications are crucial for understanding forest ecosystem health, indicating a need for further studies to fully resolve Helminthoglypta diversity.
ARCHIV FUR MOLLUSKENKUNDE
(2021)
Article
Forestry
Stevie Gildehaus, Karen Arabas, Evan Larson, Kelsey Copes-Gerbitz
TREE-RING RESEARCH
(2015)
Article
Environmental Sciences
Evan R. Larson, J. Elmo Rawling
JOURNAL OF GREAT LAKES RESEARCH
(2016)
Article
Engineering, Civil
Grant L. Harley, Justin T. Maxwell, Evan Larson, Henri D. Grissino-Mayer, Joseph Henderson, Jean Huffman
JOURNAL OF HYDROLOGY
(2017)
Article
Ecology
Evan R. Larson, Martha A. Green
NATURAL AREAS JOURNAL
(2017)
Article
Ecology
Kelsey Copes-Gerbitz, Karen Arabas, Evan Larson, Stevie Gildehaus
Article
Environmental Sciences
Matthew W. Salzer, Evan R. Larson, Andrew G. Bunn, Malcolm K. Hughes
ENVIRONMENTAL RESEARCH LETTERS
(2014)
Article
Geosciences, Multidisciplinary
Kurt F. Kipfmueller, Evan R. Larson, Scott St George
GEOPHYSICAL RESEARCH LETTERS
(2012)
Review
Ecology
Lee E. Frelich, Bernd Blossey, Erin K. Cameron, Andrea Davalos, Nico Eisenhauer, Timothy Fahey, Olga Ferlian, Peter M. Groffman, Evan Larson, Scott R. Loss, John C. Maerz, Victoria Nuzzo, Kyungsoo Yoo, Peter B. Reich
FRONTIERS IN ECOLOGY AND THE ENVIRONMENT
(2019)
Article
Geography, Physical
Evan R. Larson, Sara A. Allen, Chris A. Underwood
Summary: New and updated multi-century tree-ring chronologies were developed from living oak trees, remnants, and archeological beams in the Driftless Area, USA. A 303-year summer drought reconstruction was produced, showing extreme droughts and pluvials in the 1700s and changing frequency of drought conditions over time. Comparison with other reconstructions revealed strengths in representing moderate moisture conditions and extreme drought years. Significant correlations were found between the reconstruction and corn and soybean yields, indicating a tighter coupling of climate variability and crop productivity in recent decades.
PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT
(2021)
Article
Ecology
Kurt F. Kipfmueller, Evan R. Larson, Lane B. Johnson, Elizabeth A. Schneider
Summary: The Border Lakes Region of Minnesota and Ontario is considered a fire-dependent ecosystem, with a focus on high-severity fires in near-boreal forests. By using tree-ring and fire atlas data, researchers reconstructed multi-century surface fire records and assessed the impact of human activities on fire patterns. The decline of traditional subsistence practices by the Anishinaabeg coincided with a decrease in surface fires and changes in forest composition.
Article
Geography
Evan R. Larson, Kurt F. Kipfmueller, Lane B. Johnson
Summary: This study explores the patterns of Anishinaabeg land use and fire occurrence in the Boundary Waters Canoe Area Wilderness (BWCAW) of northern Minnesota, highlighting the intertwined relationship between human activities and the environment in shaping landscape patterns. The research findings indicate that the absence of fires in the area over the past century has led to a decline in red pine forests, presenting an opportunity for a reassessment of the management needs for these forests through the strategic return of frequent fires.
ANNALS OF THE AMERICAN ASSOCIATION OF GEOGRAPHERS
(2021)
Article
Anthropology
Evan R. Larson, Lane B. Johnson, Thomas C. Wilding, Kalina M. Hildebrandt, Kurt F. Kipfmueller, Lee R. Johnson
Article
Ecology
Berangere A. Leys, Daniel Griffin, Evan R. Larson, Kendra K. McLauchlan
Article
Archaeology
Lane B. Johnson, Lee R. Johnson, Evan R. Larson, Kurt F. Kipfmueller
HISTORICAL ARCHAEOLOGY
(2018)
Article
Geography
Evan R. Larson, Kurt F. Kipfmueller