Hydrology and climate of four watersheds in eastern Puerto Rico: Chapter C in Water quality and landscape processes of four watersheds in eastern Puerto Rico
Sheila F. Murphy, Robert F. Stallard
Sheila F. Murphy, Robert F. Stallard, editor(s)
2012, Professional Paper 1789-C
Puerto Rico lies directly in the path of the easterly trade winds, which deliver steady rainfall to the mountains and steer tropical wave systems toward the island. Hurricanes and tropical storms derived from these tropical waves differ in frequency and intensity, contributing to substantial interannual variation in precipitation and stream...
Landslides and sediment budgets in four watersheds in eastern Puerto Rico: Chapter F in Water quality and landscape processes of four watersheds in eastern Puerto Rico
Matthew C. Larsen
Sheila F. Murphy, Robert F. Stallard, editor(s)
2012, Professional Paper 1789-F
The low-latitude regions of the Earth are undergoing profound, rapid landscape change as forests are converted to agriculture to support growing population. Understanding the effects of these land-use changes requires analysis of watershed-scale geomorphic processes to better inform and manage this usually disorganized process. The investigation of hillslope erosion and...
Effects of earthworms on slopewash, surface runoff, and fine-litter transport on a humid-tropical forested hillslope in eastern Puerto Rico: Chapter G in Water quality and landscape processes of four watersheds in eastern Puerto Rico
Matthew C. Larsen, Zhigang Liu Liu, Xiaoming Zou
Sheila F. Murphy, Robert F. Stallard, editor(s)
2012, Professional Paper 1789-G
Rainfall, slopewash (the erosion of soil particles), surface runoff, and fine-litter transport were measured in tropical wet forest on a hillslope in the Luquillo Experimental Forest, Puerto Rico, from February 1998 until April 2000. Slopewash data were collected using Gerlach troughs at eight plots, each 2 square meters in area....
Land use, population dynamics, and land-cover change in eastern Puerto Rico: Chapter B in Water quality and landscape processes of four watersheds in eastern Puerto Rico
William A. Gould, Sebastián Martinuzzi, Isabel K. Pares-Ramos, Sheila F. Murphy, Robert F. Stallard
Sheila F. Murphy, Robert F. Stallard, editor(s)
2012, Professional Paper 1789-B
We assessed current and historic land use and land cover in the Luquillo Mountains and surrounding area in eastern Puerto Rico, including four small subwatersheds that are study watersheds of the U.S. Geological Survey's Water, Energy, and Biogeochemical Budgets (WEBB) program. This region occupies an area of 1,616 square kilometers,...
Weathering, landscape equilibrium, and carbon in four watersheds in eastern Puerto Rico: Chapter H in Water quality and landscape processes of four watersheds in eastern Puerto Rico
Robert F. Stallard
Sheila F. Murphy, Robert F. Stallard, editor(s)
2012, Professional Paper 1789-H
The U.S. Geological Survey's Water, Energy, and Biogeochemical Budgets (WEBB) program research in eastern Puerto Rico involves a double pair-wise comparison of four montane river basins, two on granitic bedrock and two on fine-grained volcaniclastic bedrock; for each rock type, one is forested and the other is developed. A confounding...
Physiography, geology, and land cover of four watersheds in eastern Puerto Rico: Chapter A in Water quality and landscape processes of four watersheds in eastern Puerto Rico
Sheila F. Murphy, Robert F. Stallard, Matthew C. Larsen, William A. Gould
Sheila F. Murphy, editor(s)
2012, Professional Paper 1789-A
Four watersheds with differing geology and land cover in eastern Puerto Rico have been studied on a long-term basis by the U.S. Geological Survey to evaluate water, energy, and biogeochemical budgets. These watersheds are typical of tropical, island-arc settings found in many parts of the world. Two watersheds are located...
Weathering processes in the Rio Icacos and Rio Mameyes watersheds in Eastern Puerto Rico: Chapter I in Water quality and landscape processes of four watersheds in eastern Puerto Rico
Heather L. Buss, Arthur F. White
Sheila F. Murphy, Robert F. Stallard, editor(s)
2012, Professional Paper 1789-I
Streams draining watersheds of the two dominant lithologies (quartz diorite and volcaniclastic rock) in the Luquillo Experimental Forest of eastern Puerto Rico have very high fluxes of bedrock weathering products. The Río Blanco quartz diorite in the Icacos watershed and the Fajardo volcaniclastic rocks in the Mameyes watershed have some...
Coastal wetlands of Chesapeake Bay
Andrew H. Baldwin, Patrick J. Kangas, J. Patrick Megonigal, Matthew C. Perry, Dennis F. Whigham, Darold P. Batzer
Darold P. Batzer, Andrew H. Baldwin, editor(s)
2012, Book chapter, Wetland habitats of North America: Ecology and conservation concerns
Wetlands are prominent landscapes throughout North America. The general characteristics of wetlands are controversial, thus there has not been a systematic assessment of different types of wetlands in different parts of North America, or a compendium of the threats to their conservation. Wetland Habitats of North America adopts a geographic...
Geologic framework for the national assessment of carbon dioxide storage resources: Powder River Basin, Wyoming, Montana, South Dakota, and Nebraska: Chapter B in Geologic framework for the national assessment of carbon dioxide storage resources
William H. Craddock, Ronald M. Drake II, John L. Mars, Matthew D. Merrill, Peter D. Warwick, Madalyn S. Blondes, Mayur A. Gosai, P.A. Freeman, Steven M. Cahan, Christina A. DeVera, Celeste D. Lohr
Peter D. Warwick, M.D. Corum, editor(s)
2012, Open-File Report 2012-1024-B
This report presents ten storage assessment units (SAUs) within the Powder River Basin of Wyoming, Montana, South Dakota, and Nebraska. The Powder River Basin contains a thick succession of sedimentary rocks that accumulated steadily throughout much of the Phanerozoic, and at least three stratigraphic packages contain strata that are suitable...
Modeling the mesozoic-cenozoic structural evolution of east texas
Ofori N. Pearson, Elisabeth L. Rowan, John J. Miller
2012, Gulf Coast Assoc of Geological Societies Journal (1) 118-128
The U.S. Geological Survey (USGS) recently assessed the undiscovered technically recoverable oil and gas resources within Jurassic and Cretaceous strata of the onshore coastal plain and State waters of the U.S. Gulf Coast. Regional 2D seismic lines for key parts of the Gulf Coast basin were interpreted in order to...
Assessment of undiscovered conventional oil and gas resources of six geologic provinces of China
Ronald R. Charpentier, Christopher J. Schenk, Michael E. Brownfield, Troy A. Cook, Timothy R. Klett, Janet K. Pitman, Richard M. Pollastro
2012, Fact Sheet 2012-3117
Using a geology-based assessment methodology, the U.S. Geological Survey estimated mean volumes of undiscovered conventional petroleum resources in six geologic provinces of China at 14.9 billion barrels of oil, 87.6 trillion cubic feet of natural gas, and 1.4 billion barrels of natural-gas liquids....
Influence of the Amlia fracture zone on the evolution of the Aleutian Terrace forearc basin, central Aleutian subduction zone
Holly F. Ryan, Amy E. Draut, Katie M. Keranen, David W. Scholl
2012, Geosphere (8) 1254-1273
During Pliocene to Quaternary time, the central Aleutian forearc basin evolved in response to a combination of tectonic and climatic factors. Initially, along-trench transport of sediment and accretion of a frontal prism created the accommodation space to allow forearc basin deposition. Transport of sufficient sediment to overtop the bathymetrically high...
A comparison among observations and earthquake simulator results for the allcal2 California fault model
Terry. E. Tullis, Keith B. Richards-Dinger, Michael Barall, James H. Dieterich, Edward H. Field, Eric M. Heien, Louise Kellogg, Fred F. Pollitz, John B. Rundle, Michael K. Sachs, Donald L. Turcotte, Steven N. Ward, M. Burak Yikilmaz
2012, Seismological Research Letters (83) 994-1006
In order to understand earthquake hazards we would ideally have a statistical description of earthquakes for tens of thousands of years. Unfortunately the ∼100‐year instrumental, several 100‐year historical, and few 1000‐year paleoseismological records are woefully inadequate to provide a statistically significant record. Physics‐based earthquake simulators can generate arbitrarily long...
Morphological and chemical evidence of stromatolitic deposits in the 2.75 Ga Carajás banded iron formation, Brazil
Beatriz Ribeiro da Luz, James K. Crowley
2012, Earth and Planetary Science Letters (355-356) 60-72
We describe evidence of biogenicity in the morphology and carbon content of well-preserved, Neoarchean samples of banded iron formation (BIF) from Carajás, Brazil. Silica-rich BIF layers contain translucent ellipsoidal or trapezoidal structures (∼5–10 μm diameter) composed of silica, hematite, and kerogen, which are arranged in larger ring-like forms (rosettes). Stable...
Precision of channel catfish catch estimates using hoop nets in larger Oklahoma reservoirs
David R. Stewart, James M. Long
2012, North American Journal of Fisheries Management (32) 1108-1112
Hoop nets are rapidly becoming the preferred gear type used to sample channel catfish Ictalurus punctatus, and many managers have reported that hoop nets effectively sample channel catfish in small impoundments (<200 ha). However, the utility and precision of this approach in larger impoundments have not been tested. We sought...
Holocene diatom flora and climate history of Medicine Lake, Northern California, USA
Scott W. Starratt
2012, Nova Hedwigia, Beiheft (141) 485-504
A 226-cm-long sediment core spanning the past ~ 11,400 years was recovered from Medicine Lake, on the Modoc Plateau in northeastern California. Diatom assemblages provide a record of lake level that is driven by local and regional climate changes and changes in basin morphology due to the activity of Medicine...
Developing accurate survey methods for estimating population sizes and trends of the critically endangered Nihoa Millerbird and Nihoa Finch.
P. Marcos Gorresen, Richard J. Camp, Kevin W. Brinck, Chris Farmer
2012, Technical Report HCSU-034
This report describes the results of a comparative study of bird survey methods undertaken for the purpose of improving assessments of the conservation status for the two endemic passerines on the Island of Nihoa—Nihoa Millerbird (Sylviidae: Acrocephalus familiaris kingi) and Nihoa Finch (Fringilidae: Telespiza ultima; also referred herein as millerbird...
The hydrology of a drained topographical depression within an agricutlural field in north-central Iowa
Jason L. Roth, Paul D. Capel
2012, Transactions of the American Society of Agricultural and Biological Engineers (55) 1801-1814
North-central Iowa is an agriculturally intensive area comprising the southeastern portion of the Prairie Pothole Region, a landscape containing a high density of enclosed topographical depressions. Artificial drainage practices have been implemented throughout the area to facilitate agricultural production. Vertical surface drains are utilized to drain the topographical depressions that...
Phylogeographic implications for release of critically endangered manatee calves rescued in Northeast Brazil
Fabia O. Luna, Robert K. Bonde, Fernanda L.N. Attademo, Jonathan W. Saunders, Gaia Meigs-Friend, Jose Zanon O. Passavante, Margaret E. Hunter
2012, Aquatic Conservation: Marine and Freshwater Ecosystems (22) 665-672
1. The Antillean manatee (Trichechus manatus manatus), a subspecies of the West Indian manatee, is a large-bodied marine mammal found in fresh, brackish, and marine habitats throughout the Caribbean Islands and Central and South America. Antillean manatees in Brazil are classified as critically endangered, with a census size of approximately...
Dissolved organic matter reduces algal accumulation of methylmercury
Allison C. Luengen, Nicholas S. Fisher, Brian A. Bergamaschi
2012, Environmental Toxicology and Chemistry (31) 1712-1719
Dissolved organic matter (DOM) significantly decreased accumulation of methylmercury (MeHg) by the diatom Cyclotella meneghiniana in laboratory experiments. Live diatom cells accumulated two to four times more MeHg than dead cells, indicating that accumulation may be partially an energy-requiring process. Methylmercury enrichment in diatoms relative to ambient water was measured...
Recent advances in applying decision science to managing national forests
Bruce G. Marcot, Matthew P. Thompson, Michael C. Runge, Frank R. Thompson, Steven McNulty, David Cleaves, Monica Tomosy, Larry A. Fisher, Bliss Andrew
2012, Forest Ecology and Management (285) 123-132
Management of federal public forests to meet sustainability goals and multiple use regulations is an immense challenge. To succeed, we suggest use of formal decision science procedures and tools in the context of structured decision making (SDM). SDM entails four stages: problem structuring (framing the problem and defining objectives and...
The relationship between total cholinesterase activity and mortality in four butterfly species
Timothy A. Bargar
2012, Environmental Toxicology and Chemistry (31) 2124-2129
The relationship between total cholinesterase activity (TChE) and mortality in four butterfly species (great southern white [Ascia monuste], common buckeye [Junonia coenia], painted lady [Vanessa cardui], and julia butterflies [Dryas julia]) was investigated. Acute contact toxicity studies were conducted to evaluate the response (median lethal dose [LD50] and TChE) of...
Occurrence and potential sources of pyrethroid insecticides in stream sediments from seven U.S. metropolitan areas
Kathryn Kuivila, Michelle Hladik, Christopher G. Ingersoll, Nile E. Kemble, Patrick W. Moran, Daniel L. Calhoun, Lisa H. Nowell, Robert J. Gilliom
2012, Environmental Science & Technology (46) 4297-4303
A nationally consistent approach was used to assess the occurrence and potential sources of pyrethroid insecticides in stream bed sediments from seven metropolitan areas across the United States. One or more pyrethroids were detected in almost half of the samples, with bifenthrin detected the most frequently (41%) and in each...
Predicting biological condition in southern California streams
Larry R. Brown, Jason T. May, Andrew C. Rehn, Peter R. Ode, Ian R. Waite, Jonathan G. Kennen
2012, Landscape and Urban Planning (108) 17-27
As understanding of the complex relations among environmental stressors and biological responses improves, a logical next step is predictive modeling of biological condition at unsampled sites. We developed a boosted regression tree (BRT) model of biological condition, as measured by a benthic macroinvertebrate index of biotic integrity (BIBI), for streams...
United States Geological Survey fire science: Fire danger monitoring and forecasting
Jeff C. Eidenshink, Stephen M. Howard
2012, Fact Sheet 2012-3121
Each day, the U.S. Geological Survey produces 7-day forecasts for all Federal lands of the distributions of number of ignitions, number of fires above a given size, and conditional probabilities of fires growing larger than a specified size. The large fire probability map is an estimate of the likelihood that...
