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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 5,500 book chapters 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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Multiple feedbacks due to biotic interactions across trophic levels can lead to persisten novel conditions that hinder restoration
Unlike traditional successional theory, Alternate Stable Equilibrium (ASE) theory posits that more than one community state is possible in a single environment, depending on the order that species arrive. ASE theory is often invoked in management situations where initial stressors have been removed, but native-dominated communities are not returning to degraded areas. Fundamental to this theory is
Authors
Stephanie G. Yelenik, Carla M. D'Antonio, Evan M Rehm, Iain Caldwell
Tectonic and magmatic controls on the metallogenesis of porphyry deposits in Alaska
Porphyry Cu and Mo deposits and occurrences are found throughout Alaska; they formed episodically during repeated subduction and arc-continent collisions spanning the Silurian to Quaternary. Porphyry systems occur in continental-margin and island arcs, which are broadly grouped into pre-accretionary or post-accretionary arcs. Pre-Mesozoic occurrences formed in continental or island arcs prior to a
Authors
Douglas C. Kreiner, James V. Jones, Karen D. Kelley, Garth E. Graham
The history of surface-elevation paradigms in mangrove biogeomorphology
Positioned in the intertidal zone, mangrove forests are a key model ecosystem with which to observe and test biogeomorphological concepts. Understanding how mangroves interact with their intertidal environment, particularly tidal inundation, is important if we are to assess their vulnerability or resilience to accelerated sea-level rise. While various biogeomorphological processes are now well stu
Authors
Daniel A. Friess, Karen L. McKee
Does geomorphology determine vulnerability of mangrove coasts to sea-level rise?
The greatest climate-based threat to coastlines worldwide is sea-level rise. We tested the hypothesis that tropical coasts fringed by mangroves and receiving high inputs of terrigenous sediment are less vulnerable to sea-level rise than biogenic systems dependent upon peat formation for vertical land development. An analysis of published data spanning a range of geomorphic settings showed that min
Authors
Karen L. McKee, Ken Krauss, Donald Cahoon
Radiometric constraints on the timing, tempo, and effects of large igneous province emplacement
There is an apparent temporal correlation between large igneous province (LIP) emplacement and global environmental crises, including mass extinctions. Advances in the precision and accuracy of geochronology in the past decade have significantly improved estimates of the timing and duration of LIP emplacement, mass extinction events, and global climate perturbations, and in general have supported
Authors
Jennifer Kasbohm, Blair Schoene, Seth D. Burgess
Monitoring the results of stream corridor restoration
Often overlooked and underfunded, ecological monitoring is an essential component of stream-restoration work. It helps practitioners to identify successful restoration practices, detect ineffective ones, and adjust their adaptive-management activities to improve efficacy (Bernhardt and Palmer 2011). Monitoring, along with research and modeling, are the three legs of the scientific stool that suppo
Authors
Daniel Bunting, Andrew M. Barton, Brooke M. Bushman, Barry Chernoff, Kelon Crawford, David Dean, Eduardo Gonzalez, Jeanmarie Haney, O. Hinojosa-Huerta, Helen M. Poulos, J Renfrow, Holly E. Richter, Carlos A. Sifuentes Lugo, Juliet C. Stromberg, Dale S. Turner, K. Urbanczyk, Mark K. Briggs
Quantifying and securing environmental flow
No abstract available.
Authors
Amy McCoy, Patrick B. Shafroth, Mark Briggs, Karen Schlatter, Lindsay White, Francisco Zamora, Mauricio de la Maza Benignos, Jennifer Pitt, Paul Tashjian, Yamilette Carrillo
Stream-corridor restoration: Some assembly required
No abstract available.
Authors
Mark K. Briggs, Eduardo Gonzalez, Waite R. Osterkamp, Patrick B. Shafroth, Francisco Zamora
A case for stream corridor restoration
No abstract available.
Authors
Mark K. Briggs, Osvel Hinojosa-Huerta, Waite R. Osterkamp, Patrick B. Shafroth, Carlos A. Sifuentes Lugo, Lindsay White, Francisco Zamora
Mesozoic magmatism in Montana
From crystalline batholiths with footprints larger than 4,500 km2 to beds of micron-sized ash particles, a record of Mesozoic magmatism is found throughout Montana. Mesozoic igneous rocks are an important natural resource in the state because of their association with precious metal ores and industrial mineral deposits. Mesozoic magmatism in Montana is a tale of volcanic arc eruptions, pluton empl
Authors
Kaleb C. Scarberry, Petr V. Yakovlev, Theresa Maude Schwartz
Response of aquatic life to coal mining in Appalachia
No abstract available.
Authors
George T. Merovich, Nathaniel P. Hitt, Eric R. Merriam, Jess Jones
Diving and foraging behaviors
Manatees and dugongs live in tropical and semi-tropical regions around the world. Their preferred habitats are seagrass beds, rivers, lakes, and estuaries. Manatees live in both freshwater and marine systems although habitat preferences vary across the three species, while the dugong is entirely marine. Sirenians are shallow water divers, and their dive durations are short compared to most other m
Authors
Lucy W Keith-Diagne, Margaret E Barlas, James P. Reid, Amanda J Hodgson, Helene Marsh