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Mapping methane reduction potential of tidal wetland restoration in the United States
Coastal wetlands can emit excess methane in cases where they are impounded and artificially freshened by structures that impede tidal exchange. We provide a new assessment of coastal methane reduction opportunities for the contiguous United States by combining multiple publicly available map layers, reassessing greenhouse gas emissions datasets, and applying scenarios informed by geospatial inform
Authors
James Holmquist, Meagan J. Eagle, Rebecca Molinari, Sydney K. Nick, Liana Stachowicz, Kevin D. Kroeger
Long-term trends in Arctic riverine chemistry signal multi-faceted northern change
Rivers integrate processes occurring throughout their watersheds and are therefore sentinels of change across broad spatial scales. River chemistry also regulates ecosystem function across Earth’s land–ocean continuum, exerting control from the micro- (for example, local food web) to the macro- (for example, global carbon cycle) scale. In the rapidly warming Arctic, a wide range of processes—from
Authors
Suzanne E. Tank, James W. McClelland, Robert G. M. Spencer, Alexander I. Shiklomanov, Anya Suslova, Florentina Moatar, Rainer Amon, Lee W. Cooper, Greg Elias, Vyacheslav Gordeev, Christopher Guay, Tatiana Gurtovaya, Lyudmila Kosmenko, Edda A. Mutter, Bruce Peterson, Bernhard Peucker-Ehrenbrink, Peter Raymond, Paul Schuster, Lindsay Scott, Robin Staples, Robert G. Striegl, Mikhail Tretiakov, Alexander V. Zhulidov, Nikita Zimov, Sergey Zimov, Robert M. Holmes
Predation of invasive silver carp by native largemouth bass is size-selective in the Illinois River
Silver carp (Hypophthalmichthys molitrix) are a nonnative, planktivorous, and highly invasive species of cyprinid located throughout the Mississippi River Basin. Although they co-occur with largemouth bass (Micropterus nigricans), an abundant native predatory fish, their predator–prey relationship is poorly understood. This potential relationship warrants investigation as largemouth bass are large
Authors
Eli G. Lampo, Jonathan M. Vallazza, Cory A. Anderson, Levi E. Solomon, Richard M. Pendleton, Toby J. Holda, James T. Lamer
Identifying demographic and environmental drivers of population dynamics and viability in an endangered top predator using an integrated model
Knowledge about the demographic and environmental factors underlying population dynamics is fundamental to designing effective conservation measures to recover depleted wildlife populations. However, sparse monitoring data or persistent knowledge gaps about threats make it difficult to identify the drivers of population dynamics. In situations where small, declining, or depleted populations show c
Authors
Amanda J. Warlick, Gina K Himes Boor, Tamara L McGuire, Kim E. W. Shelden, Eiren K. Jacobson, Charlotte Boyd, Paul Wade, André E. Punt, Sarah J. Converse
Scale-dependent tradeoffs between habitat and time in explaining Alligator Gar (Atractosteus spatula) movement
Ecological theory predicts that movement by riverine fishes at the population level is characterized by both stationary and mobile individuals together creating a leptokurtic distribution of movement distances. However, studies testing this theory typically ignore spatial heterogeneity in riverscapes, and the theory has not been tested using Alligator Gar (Atractosteus spatula), a species of growi
Authors
Johnathan K. Ellard, Hayden C. Roberts, Daniel J. Daugherty, Paul B. Fleming, Matthew Ross Acre, Joshuah S. Perkin
Independent age estimates resolve the controversy of ancient human footprints at White Sands
Human footprints at White Sands National Park, New Mexico, USA, reportedly date to between ~23,000 and 21,000 years ago according to radiocarbon dating of seeds from the aquatic plant Ruppia cirrhosa. These ages remain controversial because of potential old carbon reservoir effects that could compromise their accuracy. We present new calibrated 14C ages of terrestrial pollen collected from the sam
Authors
Jeffrey S. Pigati, Kathleen B. Springer, Jeffrey S. Honke, David Wahl, Marie Rhondelle Champagne, Susan R.H. Zimmerman, Harrison J. Gray, Vincent L. Santucci, Daniel Odess, David Bustos, Matthew R. Bennett
Flood damage costs beyond buildings—A Lake Champlain case study
IntroductionFloods account for more than 75 percent of Federal disaster declarations and lead other natural disasters in economic costs. Early-warning systems have lowered flood-related fatalities, but costs continue to rise as flood-prone areas continue to be urbanized (U.S. Geological Survey, 2006). A Lake Champlain case study shows that at moderate flood heights, the economic costs of non-struc
Authors
Charles Rhodes
Wide-area debris field and seabed characterization of a deep ocean dump site surveyed by autonomous underwater vehicles
Disposal of industrial and hazardous waste in the deep ocean was a pervasive global practice near coastlines in the 20th century. Uncertainty in the quantity, location, and contents of dumped materials at historical disposal sites underscores ongoing risks to marine ecosystems and human health. This study presents analysis of a 150-km2 wide-area sidescan sonar survey conducted in March 2021 with t
Authors
Sophia T. Merrifield, Sean Celona, Ryan A. McCarthy, Andrew Pietruszka, Heidi Batchelor, Robert Hess, Andrew Nager, Raymond Young, Kurt Sadorf, Lisa A. Levin, David L. Valentine, James E. Conrad, Eric J. Terrill
Critical minerals in subduction-related magmatic-hydrothermal systems of the United States
During the World War and Cold War eras (1910s–1990s), domestic consumption of numerous mineral commodities relied increasingly on imported supplies. Consumption reliance has since expanded to include 50 “critical minerals” (elements and mineral commodities) that are mostly to entirely imported and subject to curtailment by suppliers or supply chain disruption. New domestic supplies of critical min
Authors
Peter Vikre, David John, Niki E. Wintzer, Fleetwood Koutz, Frederick Graybeal, Chris Dail, David C. Annis
Long-term demographic analysis of the Cape Sable seaside sparrow (1992–2021)
The Cape Sable seaside sparrow (Ammospiza maritima mirabilis) is an endangered species that has experienced a population decline of more than 60% since 1981. Despite its critical population status, a statistically robust analysis of the species’ demographic rates utilizing all data has yet to be completed (Benscoter et al. 2021). Furthermore, long-term population processes in response to hydrologi
Authors
Marisa Takada Martinez, Laura D'Acunto, Stephanie Romanach
Comparing reintroduction strategies for the endangered San Francisco gartersnake (Thamnophis sirtalis tetrataenia) using demographic models
For endangered species persisting in a few populations, reintroductions to unoccupied habitat are a popular conservation action to increase viability in the long term. Identifying the reintroduction strategy that is most likely to result in viable founder and donor populations is essential to optimally use resources available for conservation. The San Francisco gartersnake (Thamnophis sirtalis tet
Authors
Jonathan P. Rose, Richard Kim, Elliot James Schoenig, Patrick C. Lien, Brian J. Halstead
Geochemical evidence for evolving Proterozoic crustal thickness and orogenic styles in southwestern Laurentia
It has long been challenging for researchers to track the crustal thickness and mode(s) of crustal modification in ancient convergent margins, limiting evaluation of the tectonic styles and processes that modify continental crust during orogenesis. We present trace element igneous geochemical crustal thickness proxies that quantitatively track the crustal thickness evolution of the long-lived Prot
Authors
Ian William Hillenbrand, Karl E. Karlstrom, Michael L. Williams, Amy K. Gilmer, Wayne R. Premo, Peter B Davis