An approach to regional wetland digital elevation model development using a differential global positioning system and a custom-built helicopter-based surveying system
J. W. Jones, G.B. Desmond, C. Henkle, R. Glover
2012, International Journal of Remote Sensing (33) 450-465
Accurate topographic data are critical to restoration science and planning for the Everglades region of South Florida, USA. They are needed to monitor and simulate water level, water depth and hydroperiod and are used in scientific research on hydrologic and biologic processes. Because large wetland environments and data acquisition challenge...
Ordovician of the Sauk megasequence in the Ozark region of northern Arkansas and parts of Missouri and adjacent states
Raymond L. Ethington, John E. Repetski, James R. Derby
2012, AAPG Memoir (98) 275-300
Exposures of Ordovician rocks of the Sauk megasequence in Missouri and northern Arkansas comprise Ibexian and lower Whiterockian carbonates with interspersed sandstones. Subjacent Cambrian strata are exposed in Missouri but confined to the subsurface in Arkansas. The Sauk-Tippecanoe boundary in this region is at the base of the St. Peter...
Spatio-temporal variation in male white-tailed deer harvest rates in Pennsylvania: Implications for estimating abundance
Andrew S. Norton, Duane R. Diefenbach, Bret D. Wallingford, Christopher S. Rosenberry
2012, Journal of Wildlife Management (76) 136-143
The performance of 2 popular methods that use age-at-harvest data to estimate abundance of white-tailed deer is contingent on assumptions about variation in estimates of subadult (1.5 yr old) and adult (≥2.5 yr old) male harvest rates. Auxiliary data (e.g., estimates of survival or harvest rates from radiocollared animals) can be used...
Geochemical constraints on adakites of different origins and copper mineralization
W.-D. Sun, M.-X. Ling, S.-L. Chung, X. Ding, X.-Y. Yang, H.-Y. Liang, W.-M. Fan, R. Goldfarb, Q.-Z. Yin
2012, Journal of Geology (120) 105-120
The petrogenesis of adakites holds important clues to the formation of the continental crust and copper ± gold porphyry mineralization. However, it remains highly debated as to whether adakites form by slab melting, by partial melting of the lower continental crust, or by fractional crystallization of normal arc magmas. Here,...
Concentration, distribution, and translocation of mercury and methylmercury in mine-waste, sediment, soil, water, and fish collected near the Abbadia San Salvatore mercury mine, Monte Amiata district, Italy
V. Rimondi, J. E. Gray, P. Costagliola, O. Vaselli, P. Lattanzi
2012, Science of the Total Environment (414) 318-327
The distribution and translocation of mercury (Hg) was studied in the Paglia River ecosystem, located downstream from the inactive Abbadia San Salvatore mine (ASSM). The ASSM is part of the Monte Amiata Hg district, Southern Tuscany, Italy, which was one of the world’s largest Hg districts. Concentrations of Hg and...
Stress imparted by the great 2004 Sumatra earthquake shut down transforms and activated rifts up to 400 km away in the Andaman Sea
Volkan Sevilgen, Ross S. Stein, Fred F. Pollitz
2012, Proceedings of the National Academy of Sciences of the United States of America (109) 15152-15156
The origin and prevalence of triggered seismicity and remote aftershocks are under debate. As a result, they have been excluded from probabilistic seismic hazard assessment and aftershock hazard notices. The 2004 M = 9.2 Sumatra earthquake altered seismicity in the Andaman backarc rift-transform system. Here we show that over a 300-km-long largely...
Climate-change-driven deterioration of water quality in a mineralized watershed
Andrew Todd, Andrew H. Manning, Philip L. Verplanck, Caitlin Crouch, Diane M. McKnight, Ryan Dunham
2012, Environmental Science & Technology (46) 9324-9332
A unique 30-year streamwater chemistry data set from a mineralized alpine watershed with naturally acidic, metal-rich water displays dissolved concentrations of Zn and other metals of ecological concern increasing by 100–400% (400–2000 μg/L) during low-flow months, when metal concentrations are highest. SO4 and other major ions show similar increases. A lack...
ViscoSim Earthquake Simulator
Frederick Pollitz
2012, Seismological Research Letters (83) 979-982
Synthetic seismicity simulations have been explored by the Southern California Earthquake Center (SCEC) Earthquake Simulators Group in order to guide long‐term forecasting efforts related to the Unified California Earthquake Rupture Forecast (Tullis et al., 2012a). In this study I describe the viscoelastic earthquake simulator (ViscoSim) of Pollitz, 2009. Recapitulating...
Geomorphic determinants of species composition of alpine tundra, Glacier National Park, U.S.A.
George P. Malanson, Lindsey E. Bengtson, Daniel B. Fagre
2012, Arctic, Antarctic, and Alpine Research (44) 197-209
Because the distribution of alpine tundra is associated with spatially limited cold climates, global warming may threaten its local extent or existence. This notion has been challenged, however, based on observations of the diversity of alpine tundra in small areas primarily due to topographic variation. The importance of diversity in...
The impact of biotic/abiotic interfaces in mineral nutrient cycling: A study of soils of the Santa Cruz chronosequence, California
Art F. White, Marjorie S. Schulz, Davison V. Vivit, Tomas D. Bullen, John A. Fitzpatrick
2012, Geochimica et Cosmochimica Acta (77) 62-85
Biotic/abiotic interactions between soil mineral nutrients and annual grassland vegetation are characterized for five soils in a marine terrace chronosequence near Santa Cruz, California. A Mediterranean climate, with wet winters and dry summers, controls the annual cycle of plant growth and litter decomposition, resulting in net above-ground productivities of...
Temporal trends in algae, benthic invertebrate, and fish assemblages in streams and rivers draining basins of varying land use in the south-central United States, 1993-2007
Matthew P. Miller, Jonathan G. Kennen, Jeffrey A. Mabe, Scott V. Mize
2012, Hydrobiologia (684) 15-33
Site-specific temporal trends in algae, benthic invertebrate, and fish assemblages were investigated in 15 streams and rivers draining basins of varying land use in the south-central United States from 1993–2007. A multivariate approach was used to identify sites with statistically significant trends in aquatic assemblages which were then tested for...
Spatial patterns of aquatic habitat richness in the Upper Mississippi River floodplain, USA
Nathan R. De Jager, Jason J. Rohweder
2012, Ecological Indicators (13) 275-283
Interactions among hydrology and geomorphology create shifting mosaics of aquatic habitat patches in large river floodplains (e.g., main and side channels, floodplain lakes, and shallow backwater areas) and the connectivity among these habitat patches underpins high levels of biotic diversity and productivity. However, the diversity and connectivity among the habitats...
Influences of the El Niño Southern Oscillation and the Pacific Decadal Oscillation on the timing of the North American spring
Gregory J. McCabe, Toby R. Ault, Benjamin I. Cook, Julio L. Betancourt, Mark D. Schwartz
2012, International Journal of Climatology (32) 2301-2310
Detrended, modelled first leaf dates for 856 sites across North America for the period 1900–2008 are used to examine how the El Niño Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO) separately and together might influence the timing of spring. Although spring (mean March through April) ENSO and PDO...
Geochemical modeling of changes in shallow groundwater chemistry observed during the MSU-ZERT CO2 injection experiment
Liange Zheng, J. A. Apps, N. Spycher, J. Birkholzer, Yousif K. Kharaka, James J. Thordsen, Sarah R. Beers, William N. Herkelrath, Evangelos Kakouros, Robert C. Trautz
2012, International Journal of Greenhouse Gas Control (7) 202-217
A field experiment involving the release of carbon dioxide (CO2) into a shallow aquifer was conducted near Bozeman, Montana, during the summer of 2008, to investigate the potential groundwater quality impacts in the case of leakage of CO2 from deep geological storage. As an essential part...
Emergent sandbar construction for least terns on the Missouri River: Effects on forage fishes in shallow-water habitats
J. H. Stucker, D. A. Buhl, M. H. Sherfy
2012, River Research and Applications (28) 1254-1265
Emergent sandbars on the Missouri River are actively managed for two listed bird species, piping plovers and interior least terns. As a plunge-diving piscivore, endangered least terns rely on ready access to appropriately sized slender-bodied fish: <52 mm total length for adults and <34 mm total length for young chicks. As part...
Are all intertidal wetlands naturally created equal? Bottlenecks, thresholds and knowledge gaps to mangrove and saltmarsh ecosystems
Daniel A. Friess, Ken W. Krauss, Erik M. Horstman, Thorsten Balke, Tjeerd J. Bouma, Demis Galli, Edward L. Webb
2012, Biological Reviews (87) 346-366
Intertidal wetlands such as saltmarshes and mangroves provide numerous important ecological functions, though they are in rapid and global decline. To better conserve and restore these wetland ecosystems, we need an understanding of the fundamental natural bottlenecks and thresholds to their establishment and long-term ecological maintenance. Despite inhabiting similar intertidal...
Changes in diameter growth of Taxodium distichum in response to flow alterations in the Savannah River
M Palta Monica, Thomas W. Doyle, C. Rhett Jackson, L Judy Meyer Judy, R Sharitz Rebecca
2012, Wetlands (32) 59-71
Efforts to maximize or restore ecological function on floodplains impacted by dam construction have increasingly focused on river flow management. Few studies, however, consider floodplain hydrogeomorphic position and annual climatic variation in dam impact assessment. The Savannah River, a large river ecosystem in the Southeastern United States, was impounded in...
Recent summer precipitation trends in the Greater Horn of Africa and the emerging role of Indian Ocean sea surface temperature
A. Park Williams, Christopher C. Funk, Joel Michaelsen, Sara A. Rauscher, Iain Robertson, Tommy H. G. Wils, Marcin Koprowski, Zewdu Eshetu, Neil J. Loader
2012, Climate Dynamics (39) 2307-2328
We utilize a variety of climate datasets to examine impacts of two mechanisms on precipitation in the Greater Horn of Africa (GHA) during northern-hemisphere summer. First, surface-pressure gradients draw moist air toward the GHA from the tropical Atlantic Ocean and Congo Basin. Variability of...
Fitting a structured juvenile-adult model for green tree frogs to population estimates from capture-mark-recapture field data
Azmy S. Ackleh, J. Carter, Keng Deng, Qihua Huang, Nabendu Pal, Xing Yang
2012, Bulletin of Mathematical Biology (74) 641-665
We derive point and interval estimates for an urban population of green tree frogs (Hyla cinerea) from capture–mark–recapture field data obtained during the years 2006–2009. We present an infinite-dimensional least-squares approach which compares a mathematical population model to the statistical population estimates obtained from the field data. The model is...
Programs for calibration‐based Monte Carlo simulation of recharge areas
J. Jeffrey Starn, Amvrossios C. Bagtzoglou
2012, Ground Water (50) 472-476
One use of groundwater flow models is to simulate contributing recharge areas to wells or springs. Particle tracking can be used to simulate these recharge areas, but in many cases the modeler is not sure how accurate these recharge areas are because parameters such as hydraulic conductivity and recharge have...
Effects of flow releases on macroinvertebrate assemblages in the Indian and Hudson Rivers in the Adirondack Mountains of Northern New York
Barry P. Baldigo, A. J. Smith
2012, River Research and Applications (28) 858-871
The effects of flow releases (daily during spring and four times weekly during summer) from a small impoundment on macroinvertebrate assemblages in the lower Indian River and upper Hudson River of northern New York were assessed during the summers of 2005 and 2006. Community indices, feeding guilds, dominant species and...
A reevaluation of the Munson-Nygren-Retriever submarine landslide complex, Georges bank lower slope, western north Atlantic
Jason D. Chaytor, David C. Twichell, Uri S. ten Brink
2012, Advances in Natural and Technological Hazards Research (31) 135-146
The Munson-Nygren-Retriever (MNR) landslide complex is a series of distinct submarine landslides located between Nygren and Powell canyons on the Georges Bank lower slope. These landslides were first imaged in 1978 using widely-spaced seismic reflection profiles and were further investigated using continuous coverage GLORIA sidescan imagery collected over the landslide...
Development and use of a floristic quality index for coastal Louisiana marshes
M Jenneke Visser Jenneke, Kari Cretini, Ken W. Krauss, Gregory D. Steyer
2012, Environmental Monitoring and Assessment (184) 2389-2403
The Floristic Quality Index (FQI) has been used as a tool for assessing the integrity of plant communities and for assessing restoration projects in many regions of the USA. Here, we develop a modified FQI (FQImod) for coastal Louisiana wetlands and verify it using 12 years of monitoring data from...
Anthropogenic aerosols as a source of ancient dissolved organic matter in glaciers
Aron Stubbins, Eran Hood, Peter A. Raymond, George R. Aiken, Rachel L. Sleighter, Peter J. Hernes, David Butman, Patrick G. Hatcher, Robert G. Striegl, Paul F. Schuster, Hussain A.N. Abdulla, Andrew W. Vermilyea, Durelle T. Scott, Robert G.M. Spencer
2012, Nature Geoscience (5) 198-201
Glacier-derived dissolved organic matter represents a quantitatively significant source of ancient, yet highly bioavailable carbon to downstream ecosystems. This finding runs counter to logical perceptions of age–reactivity relationships, in which the least reactive material withstands degradation the longest and is therefore the oldest. The remnants of ancient peatlands and forests...
MODFLOW-style parameters in underdetermined parameter estimation
Marco D. D’Oria, Michael N. Fienen
2012, Groundwater (50) 149-153
In this article, we discuss the use of MODFLOW-Style parameters in the numerical codes MODFLOW_2005 and MODFLOW_2005-Adjoint for the definition of variables in the Layer Property Flow package. Parameters are a useful tool to represent aquifer properties in both codes and are the only option available in the adjoint version. Moreover, for overdetermined parameter...
