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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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Effects of an early mass-flowering crop on wild bee communities and traits in power line corridors vary with blooming plants and landscape context Effects of an early mass-flowering crop on wild bee communities and traits in power line corridors vary with blooming plants and landscape context

Context Power line corridors have been repeatedly assessed as habitat for wild bees; however, few studies have examined them as bee habitat relative to nearby crop fields and surrounding landscape context.Objectives We surveyed bee communities in power line corridors near to and isolated from lowbush blueberry fields in two landscape contexts in Maine, U.S.A. We examined the influences...
Authors
Brianne Du Clos, Francis A. Drummond, Cyndy Loftin

Tracking geomorphic changes after suburban development with a high density of green stormwater infrastructure practices in Montgomery County, Maryland Tracking geomorphic changes after suburban development with a high density of green stormwater infrastructure practices in Montgomery County, Maryland

Stream morphology is affected by changes on the surrounding landscape. Understanding the effects of urbanization on stream morphology is a critical factor for land managers to maintain and improve vulnerable stream corridors in urbanizing landscapes. Stormwater practices are used in urban landscapes to manage runoff volumes and peak flows, potentially mitigating alterations to the flow...
Authors
Brianna Williams, Kristina G. Hopkins, Marina J. Metes, Daniel K. Jones, Stephanie E. Gordon, William B. Hamilton

Sedimentological and geochemical perspectives on a marginal lake environment recorded in the Hartmann’s Valley and Karasburg members of the Murray formation, Gale crater, Mars Sedimentological and geochemical perspectives on a marginal lake environment recorded in the Hartmann’s Valley and Karasburg members of the Murray formation, Gale crater, Mars

This study utilizes instruments from the Curiosity rover payload to develop an integrated paleoenvironmental and compositional reconstruction for the 65-m thick interval of stratigraphy comprising the Hartmann's Valley and Karasburg members of the Murray formation, Gale crater, Mars. The stratigraphy consists of cross-stratified sandstone (Facies 1), planar-laminated sandstone (Facies 2)...
Authors
Samantha Gwizd, Christopher M. Fedo, John P. Grotzinger, Steven G. Banham, Frances Rivera-Hernandez, Kathryn M. Stack, Kirsten L. Siebach, Michael T. Thorpe, Lucy Thompson, Catherine O’Connell-Cooper, Nathan Stein, Lauren A. Edgar, Sanjeev Gupta, David M. Rubin, Dawn Sumner, Ashwin R. Vasavada

The power of forecasts to advance ecological theory The power of forecasts to advance ecological theory

Ecological forecasting provides a powerful set of methods for predicting short- and long-term change in living systems. Forecasts are now widely produced, enabling proactive management for many applied ecological problems. However, despite numerous calls for an increased emphasis on prediction in ecology, the potential for forecasting to accelerate ecological theory development remains
Authors
Abigail S L Lewis, Christine R. Rollinson, Andrew J Allyn, Jaime Ashander, Stephanie Brodie, Cole B Brookson, Elyssa Collins, Michael C. Dietze, Amanda S. Gallinat, Noel Juvigny-Khenafou, Gerbrand Koren, Daniel J McGlinn, Hassan Moustahfid, Jody Peters, Nicholas R. Record, Caleb J Robbins, Jonathan Tonkin, Glenda M Wardle

Lacunarity as a tool for assessing landscape configuration over time and informing long-term monitoring: An example using seagrass Lacunarity as a tool for assessing landscape configuration over time and informing long-term monitoring: An example using seagrass

Context Seagrasses are submerged marine plants that have been declining globally at increasing rates. Natural resource managers rely on monitoring programs to detect and understand changes in these ecosystems. Technological advancements are allowing for the development of patch-level seagrass maps, which can be used to explore seagrass meadow spatial patterns.Objectives Our research...
Authors
Nicholas Enwright, Kelly M. Darnell, Greg A. Carter

Navigating the space between policy and practice: Toward a typology of collaborators in a federal land management agency Navigating the space between policy and practice: Toward a typology of collaborators in a federal land management agency

Navigating the space between policy and on-the-ground natural resource management presents unique challenges. We interviewed 22 U.S. Bureau of Land Management Field Office Managers to understand their perceptions toward, and applications of, collaboration with public and private stakeholders. Interviews were transcribed and open-coded using qualitative data analysis software. Then, each...
Authors
Nina Burkardt, Rebecca Thomas

Bathymetry retrieval from CubeSat image sequences with short time lags Bathymetry retrieval from CubeSat image sequences with short time lags

The rapid expansion of CubeSat constellations could revolutionize the way inland and nearshore coastal waters are monitored from space. This potential stems from the ability of CubeSats to provide daily imagery with global coverage at meter-scale spatial resolution. In this study, we explore the unique opportunity to improve the retrieval of bathymetry offered by CubeSats, specifically...
Authors
Milad Niroumand-Jadidi, Carl J. Legleiter, Francesca Bovolo

A model to assess industry vulnerability to disruptions in mineral commodity supplies A model to assess industry vulnerability to disruptions in mineral commodity supplies

Mineral commodity supply disruptions have the potential to ripple through and impact the economy in many ways. Industrial vulnerability is a crucial component of mineral commodity criticality tools as it provides guidance on the economic importance of these commodities to regional criticality indices. Using an economic model that links mineral commodity end-use data to input-output...
Authors
Ross Manley, Elisa Alonso, Nedal T. Nassar

Introduction to the special issue of the Consortium of Organizations for Strong Motion Observation Systems (COSMOS) international guidelines for applying noninvasive geophysical techniques to characterize seismic site conditions Introduction to the special issue of the Consortium of Organizations for Strong Motion Observation Systems (COSMOS) international guidelines for applying noninvasive geophysical techniques to characterize seismic site conditions

Knowledge about local seismic site conditions provides critical information to account for site effects that are commonly observed in strong motion recordings. Certainly, other wave propagation effects can influence these observations, which are attributable to variations in material properties of the paths traveled by the waves, as well as the characteristics of the seismic source...
Authors
Alan Yong, Aysegul Askan, John Cassidy, Sebastiano D’Amico, Stefano Parolai, Marco Pilz, William J. Stephenson

Diatom influence on the production characteristics of hydrate-bearing sediments: Examples from Ulleung Basin, offshore South Korea Diatom influence on the production characteristics of hydrate-bearing sediments: Examples from Ulleung Basin, offshore South Korea

The Ulleung Basin Gas Hydrate field expeditions in 2007 (UBGH1) and 2010 (UBGH2) sought to assess the Basin's gas hydrate resource potential. Coring operations in both expeditions recovered evidence of gas hydrate, primarily as fracture-filling (or vein type) morphologies in mainly silt-sized, fine-grained sediment, but also as pore-occupying hydrate in the coarser-grained layers of...
Authors
Junbong Jang, William F. Waite, Laura A. Stern, Joo Yong Lee

Deciphering natural and anthropogenic nitrate and recharge sources in arid region groundwater Deciphering natural and anthropogenic nitrate and recharge sources in arid region groundwater

Recently, the subsoils of ephemeral stream (arroyos) floodplains in the northern Chihuahuan Desert were discovered to contain large naturally occurring NO3− reservoirs (floodplain: ~38,000 kg NO3-N/ha; background: ~60 kg NO3-N/ha). These reservoirs may be mobilized through land use change or natural stream channel migration which makes differentiating between anthropogenic and natural...
Authors
Benjamin S. Linhoff

Local groundwater decline exacerbates response of dryland riparian woodlands to climatic drought Local groundwater decline exacerbates response of dryland riparian woodlands to climatic drought

Dryland riparian woodlands are considered to be locally buffered from droughts by shallow and stable groundwater levels. However, climate change is causing more frequent and severe drought events, accompanied by warmer temperatures, collectively threatening the persistence of these groundwater dependent ecosystems through a combination of increasing evaporative demand and decreasing...
Authors
Jared Williams, John C Stella, Steven L. Voelker, Adam M Lambert, Lissa Pelletier, John E Drake, Jonathan M. Friedman, Dar A. Roberts, Michael B. Singer
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