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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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A practical guide to understanding and validating complex models using data simulations A practical guide to understanding and validating complex models using data simulations

Biologists routinely fit novel and complex statistical models to push the limits of our understanding. Examples include, but are not limited to, flexible Bayesian approaches (e.g. BUGS, stan), frequentist and likelihood-based approaches (e.g. packages lme4) and machine learning methods.These software and programs afford the user greater control and flexibility in tailoring complex...
Authors
Graziella Vittoria DiRenzo, Ephraim Hanks, David A. W. Miller

Rainforest carnivore ecology in a managed forest reserve: Differential seasonal correlates between habitat components and relative abundance Rainforest carnivore ecology in a managed forest reserve: Differential seasonal correlates between habitat components and relative abundance

Studies of relationships between seasons and Neotropical carnivore distributions tend to focus on water and prey availability without considering other habitat components such as escape, foraging, and resting cover. Our goal was to evaluate habitat characteristics that may be important for predicting the seasonal (dry or rainy) relative abundance of four commonly captured Neotropical...
Authors
Lauren N. Watine, Emma V. Willcox, Joseph D. Clark, Craig A. Harper

Spatial and temporal patterns in Arctic mosquito abundance Spatial and temporal patterns in Arctic mosquito abundance

Organisms that undergo a shift in ontogeny and habitat type often change their spatial distribution throughout their life cycle, but how this affects population dynamics remains poorly understood.We examined spatial and temporal patterns in Aedes nigripes abundance, a widespread univoltine Arctic mosquito species (Diptera: Culicidae), hypothesizing that the spatial distribution of adults...
Authors
Melissa H DeSiervo, Rebecca A Finger-Higgens, Matthew P. Ayres, Ross A Virginia, Lauren E Culler

Spatial analysis of globally detected volcanic lightning from the June 2019 eruption of Raikoke volcano, Kuril Islands Spatial analysis of globally detected volcanic lightning from the June 2019 eruption of Raikoke volcano, Kuril Islands

The 21–22 June 2019 eruption of Raikoke volcano, Russia, provided an opportunity to explore how spatial trends in volcanic lightning locations provide insights into pulsatory eruption dynamics. Using satellite-derived plume heights, we examine the development of lightning detected by Vaisala’s Global Lightning Dataset (GLD360) from eleven, closely spaced eruptive pulses. Results from one
Authors
Cassandra M. Smith, Alexa R. Van Eaton, David J. Schneider, Larry G. Mastin, Robin S. Matoza, Kathleen McKee, Sean Maher

Investigating impacts of small dams and dam removal on dissolved oxygen in streams Investigating impacts of small dams and dam removal on dissolved oxygen in streams

Small surface-release dams are prevalent across North American watersheds and can alter stream flow, thermal regimes, nutrient dynamics, and sediment transport. These dams are often implicated as a cause of negative water quality impacts—including reduced dissolved oxygen (DO)—and dam removal is increasingly employed to restore natural stream processes and improve DO. However, published...
Authors
Katherine M. Abbott, Peter A. Zaidel, Allison H. Roy, Kristopher M. Houle, Keith H. Nislow

A review of supervised learning methods for classifying animal behavioural states from environmental features A review of supervised learning methods for classifying animal behavioural states from environmental features

Accurately predicting behavioural modes of animals in response to environmental features is important for ecology and conservation. Supervised learning (SL) methods are increasingly common in animal movement ecology for classifying behavioural modes. However, few examples exist of applying SL to classify polytomous animal behaviour from environmental features especially in the context of...
Authors
Silas Bergen, Manuela Huso, Adam E. Duerr, Missy A Braham, Sara Schmuecker, Tricia A. Miller, Todd E. Katzner

Conduit processes in crystal-rich dacitic magma and implications for eruptive cycles at Guagua Pichincha volcano, Ecuador Conduit processes in crystal-rich dacitic magma and implications for eruptive cycles at Guagua Pichincha volcano, Ecuador

Stratovolcanoes are commonly characterised by cyclic eruptive activity marked by transitions between dome-forming, Vulcanian, Subplinian and Plinian eruptions. Guagua Pichincha volcano (Ecuador) has been a location of such cyclicity for the past ~ 2000 years, with Plinian eruptions in the first and tenth centuries AD (Anno Domini/after Christ), and CE (Common Era) 1660, which were...
Authors
Mathieu Colombier, Benjamin Bernard, Heather M. Wright, Jean-Luc Le Pennec, Francisco Caceres, Corrado Cimarelli, Michael J. Heap, Pablo Samaniego, Jeremie Vasseur, Donald B. Dingwell

Grasshopper species composition differs between prairie dog colonies and undisturbed sites in a sagebrush grassland Grasshopper species composition differs between prairie dog colonies and undisturbed sites in a sagebrush grassland

Grasshoppers are major consumers of plant biomass in grassland and shrubland ecosystems. While often considered generalists, grasshopper species have differing habitat preferences and interactions with other consumers in grasslands. There are conflicting accounts of how prairie dog colonies and differences in vegetation impact grasshopper abundance and composition. We conducted a...
Authors
Ian S. Pearse, Courtney J. Duchardt, Lillian Legg, Lauren M. Porensky

Bacteria common to rhizosphere communities of Asiatic bittersweet across a post-glacial landscape Bacteria common to rhizosphere communities of Asiatic bittersweet across a post-glacial landscape

Invasive plants such as Asiatic bittersweet (Celastrus orbiculatus Thunb.) are a significant problem for land managers as they impact plant species composition, disrupt nutrient dynamics and structure of native ecosystems, and are difficult to eradicate. As a result of the increasing abundance of Asiatic bittersweet across the eastern U.S., we have been investigating underlying factors...
Authors
Cindy H. Nakatsu, Noel B. Pavlovic, Muruleedhara Byappanahalli

Lithology and disturbance drive cavefish and cave crayfish occurrence in the Ozark Highlands ecoregion Lithology and disturbance drive cavefish and cave crayfish occurrence in the Ozark Highlands ecoregion

Diverse communities of groundwater-dwelling organisms (i.e., stygobionts) are important for human wellbeing; however, we lack an understanding of the factors driving their distributions, making it difficult to protect many at-risk species. Therefore, our study objective was to determine the landscape factors related to the occurrence of cavefishes and cave crayfishes in the Ozark...
Authors
Joshua B. Mouser, Shannon K. Brewer, Matthew L. Niemiller, Robert Mollenhauer, Ronald A. Van Den Bussche

Rupture scenarios for the 3 June 1770 Haiti earthquake Rupture scenarios for the 3 June 1770 Haiti earthquake

The 2010 M 7.0 Haiti earthquake provided the impetus to reconsider historical earthquakes in Hispaniola (Bakun et al., 2012). That earthquake also shed new light on complex fault systems along Haiti’s southern peninsula (Douilly et al., 2013; Saint Fleur et al., 2015). Recently, the 2021 M 7.2 Nippes earthquake (Calais et al., 2022; Douilly et al., 2022), and a recent study reconsidering...
Authors
Susan E. Hough, Stacey S. Martin, Steeve Symithe, Richard W. Briggs

Evaluating noninvasive methods for estimating cestode prevalence in a wild carnivore population Evaluating noninvasive methods for estimating cestode prevalence in a wild carnivore population

Helminth infections are cryptic and can be difficult to study in wildlife species. Helminth research in wildlife hosts has historically required invasive animal handling and necropsy, while results from noninvasive parasite research, like scat analysis, may not be possible at the helminth species or individual host levels. To increase the utility of noninvasive sampling, individual hosts...
Authors
E E Brandell, M.K. Jackson, Paul C. Cross, A.J. Piaggio, D. R. Taylor, Douglas W. Smith, B Boufana, Daniel R. Stahler, PJ Hudson
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