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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 65,000 articles authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Insights from growing Globorotalia truncatulinoides and Globorotalia menardii in the laboratory Insights from growing Globorotalia truncatulinoides and Globorotalia menardii in the laboratory
The vast majority of planktic foraminiferal culture studies have been carried out on spinose species of foraminifera, with relatively few studies on non-spinose species. We conducted a pilot study to test whether live specimens of the non-spinose planktic foraminifera, Globorotalia truncatulinoides and Globorotalia menardii, could be successfully harvested from offshore plankton tow...
Authors
Caitlin E. Reynolds, Jennifer S. Fehrenbacher, Kaustubh Thirumalai, Eric J. Tappa, Julie N. Richey
Growth patterns of invasive Silver Carp in the Mississippi River basin Growth patterns of invasive Silver Carp in the Mississippi River basin
Silver Carp (Hypophthalmichthys molitrix) are an invasive fish in the Mississippi River Basin. Their rapid expansion over recent decades coupled with extraordinary growth rates have arguably caught many by surprise. Understanding the atypical growth rates that could be the driving force behind the Silver Carp's explosive expansion may be crucial for development of management strategies...
Authors
Leandro E. Miranda
Discovery of late Holocene-aged Acropora palmata reefs in Dry Tortugas National Park, Florida, USA: The past as a key to the future? Discovery of late Holocene-aged Acropora palmata reefs in Dry Tortugas National Park, Florida, USA: The past as a key to the future?
Emblematic of global coral-reef ecosystem decline, the coral ecosystem-engineer Acropora palmata is now rare throughout much of the western Atlantic. Understanding when and where this foundation species occurred during the past can provide information about the environmental limits defining its distribution through space and time. In this paper, the present, historical and newly dated...
Authors
Anastasios Stathakopoulos, Lauren T. Toth, Peter Alexander Bacon Modys, Selena Anne-Marie Johnson, Ilsa B. Kuffner
Editorial: Parasite, host, and microbiome interactions in natural host systems Editorial: Parasite, host, and microbiome interactions in natural host systems
No abstract available.
Authors
Claire E. Couch, Raquel Xavier, Brianna R. Beechler
Regional patterns in U.S. wildfire activity: The critical role of ignition sources Regional patterns in U.S. wildfire activity: The critical role of ignition sources
As extreme wildfires increase globally, understanding their causes is critical for effective management. While climate and housing growth are commonly linked to rising fire activity, the role of specific ignition sources—particularly human-caused—remains understudied. Analyzing a 79-year dataset (1940–2019) from U.S. Forest Service regions across the continental United States, we found...
Authors
Alexandra D. Syphard, Jon E. Keeley, Erin Conlisk, Mike Gough
Causal effects verses causal mechanisms: Two traditions with different requirements and contributions towards causal understanding Causal effects verses causal mechanisms: Two traditions with different requirements and contributions towards causal understanding
The scientific aspiration of building causal knowledge has received little explicit discussion in ecology despite its fundamental importance. When methods are described as ‘causal’, emphasis is increasingly placed on statistical techniques for isolating associations so as to quantify causal effects. In contrast, natural scientists have historically approached the pursuit of causal...
Authors
James Grace, Nick Huntington-Klein, E. William Schweiger, Melinda Martinez, Michael Osland, Laura C. Feher, Glenn R. Guntenspergen, Karen M. Thorne
Simulated effects of future water availability and protected species habitat in a perennial wetland, Santa Barbara County, California Simulated effects of future water availability and protected species habitat in a perennial wetland, Santa Barbara County, California
This study evaluates the potential water availability in Barka Slough and the effects of changing hydrological conditions on the aquatic habitat of five protected species. Barka Slough is a historically perennial wetland at the downstream western end of the San Antonio Creek Valley watershed (SACVW). A previously published hydrologic model of the SACVW for 1948–2018 was extended to...
Authors
Geoffrey Cromwell, Daniel Philip Culling, Matthew J. Young, Joshua Larsen
Mahi-mahi metacouplings: Quantifying human–nature interactions in dolphinfish (Coryphaena hippurus) fisheries Mahi-mahi metacouplings: Quantifying human–nature interactions in dolphinfish (Coryphaena hippurus) fisheries
Fisheries encompass humans and fish, but fisheries researchers rarely model human–nature interactions over space and time. I filled this information gap for dolphinfish (Coryphaena hippurus), a popular, widely distributed species that supports industrial, artisanal, recreational, and subsistence fisheries. Dolphinfish human–nature interactions showed a long-term up-and-down pattern in...
Authors
Andrew Kenneth Carlson
Do mule deer surf peaks in forage quality while on summer range? Do mule deer surf peaks in forage quality while on summer range?
Many animals track ephemeral peaks in food abundance and quality that propagate across landscapes. Migrating ungulates, in particular, track waves of newly emerging plants from low-elevation winter ranges to high-elevation summer ranges—known as “green-wave surfing.” Because plants lose crude protein and gain insoluble fiber with maturation, ruminants are expected to exploit peaks in...
Authors
Anna Ortega, Kevin L. Monteith, Benjamin Wise, Matthew J. Kauffman
Ecologically informed solar enables a sustainable energy transition in U.S. croplands Ecologically informed solar enables a sustainable energy transition in U.S. croplands
United States (U.S.) croplands are ideal recipient environments for solar photovoltaic (PV) energy because they are flat and have a high solar resource. Perceived threats of solar to agriculture have led some stakeholders to suggest that croplands be exclusively used to produce food. However, 12 million hectares of U.S. croplands, an area about the size of New York State, are already...
Authors
Matthew A. Sturchio, Adam Gallaher, Steven Mark Grodsky
Comparative properties of saponitic fault gouge and serpentinite muds cored from mud volcanoes of the Mariana subduction zone Comparative properties of saponitic fault gouge and serpentinite muds cored from mud volcanoes of the Mariana subduction zone
We obtained 12 core samples for physical and chemical characterization from three serpentinite mud volcanoes (Yinazao, Asùt Tesoru, and Fantangisña) located on the forearc of the Mariana subduction system, that were drilled during International Ocean Discovery Program Expedition 366. Two samples from the Fantangisña mud volcano are interpreted to be clay-rich fault gouges derived from...
Authors
Diane E. Moore, C.A. Morrow, David A. Lockner, Barbara A. Bekins
Using DNA barcoding to evaluate freshwater mussel and fish-host relationships in the Flint River (Georgia, USA) Using DNA barcoding to evaluate freshwater mussel and fish-host relationships in the Flint River (Georgia, USA)
Freshwater mussels have a unique life history in which larval mussels (glochidia) act as obligate parasites to fish hosts. Host selectivity may be species specific, and identification of host fish is a critical step in conservation planning for individual mussel species. The Flint River harbors ~23% of the freshwater mussel (order Unionida) diversity in the state of Georgia, USA. Nine...
Authors
Hayley A. Robinson, John P. Wares, Gail M. Cowie, Shayla D. Williams, Ben F Scott, Matthew T. Rowe, Nathan Johnson, Peter D. Hazelton