Publications
Publications from the Alaska Science Center.
Filter Total Items: 3153
A time-space model of graphite mineral systems A time-space model of graphite mineral systems
Increasing demand for graphite in energy storage systems warrants review of graphite ore genesis in a mineral systems framework. Orogenic graphite encompasses the metamorphic and orogenic mineral systems that produce flake graphite and hydrothermal vein (lump and chip) graphite deposits, respectively. A common feature of orogenic graphite deposits is an association with upper amphibolite...
Authors
George Case
Power source, data retrieval method, and attachment type affect success of dorsally mounted tracking tag deployments in 37 species of shorebirds Power source, data retrieval method, and attachment type affect success of dorsally mounted tracking tag deployments in 37 species of shorebirds
Animal-borne trackers are commonly used to study bird movements, including in long-distance migrants such as shorebirds. Selecting a tracker and attachment method can be daunting, and methodological advancements often have been made by trial and error and conveyed by word of mouth. We synthesized tracking outcomes across 2745 dorsally mounted trackers on 37 shorebird species around the...
Authors
Emily Weiser, Richard Lanctot, Daniel Ruthrauff, Sarah Saalfeld, Lee Tibbitts, José Abad-Gómez, Joaquin Aldabe, Juliana de Almeida, José A. Alves, Guy Anderson, Phil Battley, Heinrich Belting, Joël Bêty, Kristin Bianchini, Mary Bishop, Roeland Bom, Katharine Bowgen, Glen Brown, Stephen Brown, Leandro Bugoni, Niall Burton, David Bybee, Camilo Carneiro, Gabriel Castresana, Ying-Chi Chan, Chi-Yeung Choi, Katherine Christie, Nigel A. Clark, Jesse Conklin, Medardo Cruz-López, Stephen J. Dinsmore, Steve Dodd, David C. Douglas, Luke Eberhart-Hertel, Willow English, Harry Ewing, Fernando Faria, Samantha Franks, Richard A. Fuller, Robert E. Gill, Marie-Andrée Giroux, Cheri Gratto-Trevor, David Green, Rhys Green, Ros Green, Tómas Gunnarsson, Jorge Gutiérrez, Autumn-Lynn Harrison, C. Hartman, Chris J. Hassell, Sarah Hoepfner, Jos Hooijmeijer, James Johnson, Oscar Johnson, Bart Kempenaers, Marcel Klaassen, Eva Kok, Johannes Krietsch, Clemens Küpper, Andy Kwarteng, Eunbi Kwon, Jean-Francois Lamarre, Christopher Latty, Nicolas Lecomte, A.H. Loonstra, Zhijun Ma, Lucas Mander, Christopher Marlow, Peter P. Marra, Jose Masero, Laura McDuffie, Rebecca L McGuire, Johannes Melter, David Melville, Verónica Méndez, Tyler Michels, Christy Morrissey, Tong Mu, David Newstead, Gary W. Page, Allison Pierce, Theunis Piersma, Márcio Repenning, Brian Robinson, Afonso Rocha, Danny Rogers, Amy L. Scarpignato, Shiloh Schulte, Emily Scragg, Nathan Senner, Paul Smith, Audrey Taylor, Rachel Taylor, Böðvar Þórisson, Mihai Valcu, Mo Verhoeven, Lena Ware, Nils Warnock, Michael Weber, Lucy J. Wright, Michael Wunder
River ice controls permafrost bank erosion across an Arctic delta River ice controls permafrost bank erosion across an Arctic delta
Bank erosion in Arctic rivers helps shape channel geometry, mobilizes carbon from permafrost and influences sediment delivery to the Arctic Ocean. On Alaska's Arctic coastal plain, rivers begin flowing during snowmelt in late spring while extensive river ice persists in channels, such that hydraulics are altered and water is kept cool. The effects of river ice on permafrost bank erosion...
Authors
J Arcuri, Irina Overeem, Marisa Repasch, R. Anderson, S. Anderson, Joshua Koch, Frank Urban
The effects of carnivory and herbivory on the energy balance of Arctic grizzly bears The effects of carnivory and herbivory on the energy balance of Arctic grizzly bears
Omnivores often face tradeoffs between selecting for spatially dispersed energy-dense vertebrate prey versus densely distributed herbivorous resources that have limited energetic value per unit intake. Arctic grizzly bears (Ursus arctos) are large omnivores within a resource-limited ecosystem that are known to exhibit smaller body masses and occur at lower densities than grizzly bears in...
Authors
Anthony Pagano, Karyn Rode, Kerry Nicholson, William Leacock, Craig Stricker, Charles Robbins
Observational, virological, and serological data provide insights into an outbreak of highly pathogenic avian influenza among wild birds on the Yukon-Kuskokwim Delta, Alaska in 2022 Observational, virological, and serological data provide insights into an outbreak of highly pathogenic avian influenza among wild birds on the Yukon-Kuskokwim Delta, Alaska in 2022
In 2021–22, clade 2.3.4.4b highly pathogenic avian influenza (HPAI) viruses were introduced by wild birds into North America, leading to geographically widespread disease. In response to HPAI outbreaks throughout late 2021 and early 2022, we recorded observations of sick and dead birds, estimated abundance of carcasses, collected swab and sera samples to detect viruses, and monitored...
Authors
Bryan Daniels, Erik Osnas, Megan Boldenow, Robert Gerlach, Christina Ahlstrom, Sarah Coburn, Michael Brook, Michael Brubaker, Julian Fischer, David Koons, Angela Matz, Marin Murphy, Daniel Rizzolo, Laura Scott, David Sinnett, Jordan Thompson, Juliana Lenoch, Mia Kim Torchetti, David E. Stallknecht, Rebecca L. Poulson, Andrew Ramey
Reply to the discussion by Pilfold “Polar bear mass change confirms hyperphagia follows ringed seal whelping” Reply to the discussion by Pilfold “Polar bear mass change confirms hyperphagia follows ringed seal whelping”
The spring is a critical period when polar bears (Ursus maritimus Phipps, 1774) are thought to have peak access to seals and acquire the majority of their annual energy requirements during a period of hyperphagia. Pagano et al. (Pagano A.M., Atkinson S.N., and Archer L.C. 2025. Arctic Science.11:1-14. doi:10.1139/as-2024-0051) examined the intra-seasonal changes in body mass of 31 polar...
Authors
Anthony Pagano, Stephen Atkinson, Louise Archer
Monitoring Pacific walrus coastal haulouts by satellite to estimate herd abundance and distribution Monitoring Pacific walrus coastal haulouts by satellite to estimate herd abundance and distribution
The Pacific walrus (Odobenus rosmarus divergens) has a single, panmictic stock that ranges across the Bering and Chukchi Seas. However, its seasonal distribution is incompletely described, particularly in autumn when herds gather on shore, and abundance is of interest to management entities. We monitored walrus herds using satellite imagery on shore across their summer and autumn range...
Authors
Anthony S. Fischbach, Rebecca Taylor, David C. Douglas
Deformation mechanisms in quartz veins and shear zones elucidate the origin of gold mineralization at Pogo, Alaska Deformation mechanisms in quartz veins and shear zones elucidate the origin of gold mineralization at Pogo, Alaska
Pogo is a quartz vein hosted, ca. 8 Moz gold deposit. Although it has similarities to orogenic and magmatic-hydrothermal deposits, its origin remains enigmatic. Observations from surface exposures, underground workings, and drill core provide new constraints on quartz vein origins with implications for mineralization. Abundant, largely barren metamorphic segregation quartz veins are...
Authors
Jonathan Caine, Douglas Kreiner, Heather Lowers
Earth Mapping Resources Initiative protocols—Sampling hard-rock mine waste and perpetual mine water sources Earth Mapping Resources Initiative protocols—Sampling hard-rock mine waste and perpetual mine water sources
Supporting the overarching goal to evaluate critical minerals nationwide, the mine waste characterization effort in the U.S. Geological Survey (USGS) Earth Mapping Resources Initiative has created a series of protocols to standardize sampling carried out under this effort by the participating State geological surveys and their cooperators. The protocols are based on published, reviewed...
Authors
Kate Campbell, Robert Seal, Nadine Piatak, Jaime S. Azain, Jean Morrison, Sarah White, Andrew Manning, Katherine Walton-Day, JoAnn Holloway, Bronwen Wang
Bears avoid residential neighborhoods in response to the experimental reduction of anthropogenic attractants Bears avoid residential neighborhoods in response to the experimental reduction of anthropogenic attractants
Introduction: Urbanization is an extreme form of land use alteration, with human development driving changes in the distribution of resources available to wildlife. Some large carnivores have learned to exploit anthropogenic food resources in urban development, resulting in human-carnivore conflict that can have detrimental impacts to people and carnivores, as exemplified by American...
Authors
Cassandre Venumière-Lefebvre, Heather Johnson, Stewart Breck, Mathew Alldredge, Kevin Crooks
Accounting for seasonal patterns in bird availability prevents biased population trend estimates with advancing spring phenology Accounting for seasonal patterns in bird availability prevents biased population trend estimates with advancing spring phenology
Advancing spring phenology has been observed around the world, including changes in the timing of breeding of birds. When singing rates are tied to breeding stage, the rate at which birds are available for detection by surveyors can also show seasonal patterns that may shift with spring phenology. As the timing of peak bird availability changes over years, monitoring programs that do not...
Authors
Emily Weiser, James Johnson, Steven Matsuoka, Colleen Handel
Energetic value of Arctic forage-sized fish with implications for a nearshore seabird predator Energetic value of Arctic forage-sized fish with implications for a nearshore seabird predator
Arctic cod (Boreogadus saida, also called polar cod) are considered the single most important Arctic forage fish due to their high abundance and nutritional quality. Because Arctic cod are strongly ice associated and prefer colder waters, their frequency in coastal waters has declined with warming, decreasing availability to nearshore predators. To consider the nutritional quality of...
Authors
Ashley Stanek, Brian Uher-Koch, Kenneth Dunton, Vanessa von Biela