United States Geological Survey

Polystyrene microplastics alter the accumulation and elimination dynamics of silver nanoparticles in Daphnia magna

Environmental context Microplastics are widespread aquatic contaminants that can alter the environmental behavior of co-occurring pollutants. This study shows that polystyrene microplastics substantially modify silver nanoparticle bioaccumulation in Daphnia magna, increasing wate...

Resolving circumarctic zero-curtain phenomena with AI-integrated earth observations

<title>Abstract</title> Across the circumarctic, permafrost landscapes store approximately 1700 billion metric tons of organic carbon - nearly twice atmospheric levels - yet reservoir stability depends on the zero-curtain, a subsurface thermal plateau that emerges when latent hea...

Investigating Hydrologic Alteration Under Historical and Future Scenarios in the Mobile River and Perdido River Basins Using the Cubist Algorithm

Study RegionMobile River and Perdido River Basins of Alabama, USA.Study FocusThis study investigates the impacts of human activities and climate variability on hydrologic alterations in the Mobile River and Perdido River Basins of Alabama. The research uses a machine learning app...

Storage timescales and the crystal growth history recorded in the layered reservoir of the Unit 3 Kulanaokuaiki Tephra Member of the Uēkahuna Ash from Kīlauea volcano

Abstract The Kulanaokuaiki Tephra Unit 3 (900 C.E.) was a subplinian basaltic scoria eruption, the largest known to have occurred at Kīlauea’s summit. The initiation mechanism and cause(s) of this highly hazardous eruption remain poorly understood, particularly as this style of a...

Forest canopy decline under elevated CO 2 during the Paleocene-Eocene Thermal Maximum

Uncertainty remains regarding the impact of rapid anthropogenic warming on forest ecosystem structure, biodiversity, and function. As an analog, we reconstruct forest canopy density and compositional change in Wyoming, USA, through the Paleocene-Eocene Thermal Maximum (PETM), an...

Quaternary Arctic planktonic foraminifera: morphological differentiation and taxonomic reassessment of subpolar spinose taxa

Abstract. Planktonic foraminifera in the modern Arctic Ocean are dominated by the non-spinose polar species Neogloboquadrina pachyderma. Acmes of two spinose, presumed subpolar taxa in Quaternary central Arctic sediment cores are therefore anomalous, implying significantly differ...

Estimating the Importance of Floating Surface Material to the Total Phosphorus Transport in Silver Creek, Wisconsin Using Particle Image Velocimetry

Various techniques are used to estimate nutrient delivery in streams that combine flow and water-quality data. However, the transport of surface floating material is difficult to measure, and is therefore typically neglected when stream sampling and in the estimated nutrient deli...

Validation of daily age in Grass Carp reared in tanks and outdoor ponds in the U.S. Midwest

Abstract Objective Accurate and precise age estimation is essential for understanding early life history, recruitment, and population dynamics in fish. However, daily otolith increment deposition has not been validated for Grass Carp Ctenopharyngodon idella in the Midwestern Unit...

Navigating uncertainty and competing objectives: Spring chinook salmon recovery in the upper Willamette river

Globally, anadromous fish populations are threatened with extinction due to multiple factors, including river impoundments that block migration, widespread alteration of physical habitat, temperature, and flow regimes, commercial and recreational harvest, changes in biological co...

The Zooplankton International Geospatial dataset: A global repository of spatiotemporal freshwater zooplankton community composition data from lakes and reservoirs to support ecological research

Abstract Zooplankton transfer substantial energy in aquatic food webs and are used as indicators of environmental change. Syntheses of zooplankton community dynamics globally require datasets that span a wide range of environmental gradients; however, these datasets are limited d...

Treat Lesson Material Like Open-Source Software: The Methodology Behind What They Forgot to Teach in Python 101

This poster presents an approach for treating Python lesson materials like open-source software, where workshop notebooks are developed, taught, refined through feedback, and released for continued reuse. The poster highlights an example lesson from What They Forgot to Teach in P...

Reticulated adaptive radiation and phylogenomic diversity loss in the Hawaiian honeycreepers

The Hawaiian honeycreepers, one of the world’s most iconic adaptive radiations, are facing a human-mediated extinction crisis. More than 60 Hawaiian honeycreepers (Fringillidae: Carduelinae: Drepanidini) evolved from a single rosefinch-like ancestor that colonized the Hawaiian Is...