Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16702
Relationship between water and aragonite barium concentrations in aquaria reared juvenile corals Relationship between water and aragonite barium concentrations in aquaria reared juvenile corals
Coral barium to calcium (Ba/Ca) ratios have been used to reconstruct records of upwelling, river and groundwater discharge, and sediment and dust input to the coastal ocean. However, this proxy has not yet been explicitly tested to determine if Ba inclusion in the coral skeleton is directly proportional to seawater Ba concentration and to further determine how additional factors such as...
Authors
Meagan Gonneea Eagle, Anne L. Cohen, Thomas M. DeCarlo, Matthew A. Charette
Integrating count and detection–nondetection data to model population dynamics Integrating count and detection–nondetection data to model population dynamics
There is increasing need for methods that integrate multiple data types into a single analytical framework as the spatial and temporal scale of ecological research expands. Current work on this topic primarily focuses on combining capture–recapture data from marked individuals with other data types into integrated population models. Yet, studies of species distributions and trends often...
Authors
Elise F. Zipkin, Sam Rossman, Charles B. Yackulic, David Wiens, James T. Thorson, Raymond J. Davis, Evan H. Campbell Grant
Soils as relative-age dating tools Soils as relative-age dating tools
Soils develop at the earth's surface via multiple processes that act through time. Precluding burial or disturbance, soil genetic horizons form progressively and reflect the balance among formation processes, surface age, and original substrate composition. Soil morphology provides a key link between process and time (soil age), enabling soils to serve as both relative and numerical...
Authors
Helaine W. Markewich, Milan J. Pavich, Douglas A. Wysocki
Application of molluscan analyses to the reconstruction of past environmental conditions in estuaries Application of molluscan analyses to the reconstruction of past environmental conditions in estuaries
Molluscs possess a number of attributes that make them an excellent source of past environmental conditions in estuaries: they are common in estuarine environments; they typically have hard shells and are usually well preserved in sediments; they are relatively easy to detect in the environment; they have limited mobility as adults; they grow by incremental addition of layers to their...
Authors
G. Lynn Wingard, Donna Surge
Olivine-melt relationships and syneruptive redox variations in the 1959 eruption of Kīlauea Volcano as revealed by XANES Olivine-melt relationships and syneruptive redox variations in the 1959 eruption of Kīlauea Volcano as revealed by XANES
The 1959 summit eruption of Kīlauea Volcano exhibited high lava fountains of gas-rich, primitive magma, containing olivine + chromian spinel in highly vesicular brown glass. Microprobe analysis of these samples shows that euhedral rims on olivine phenocrysts, in direct contact with glass, vary significantly in forsterite (Fo) content, at constant major-element melt composition, as do...
Authors
Rosalind L. Helz, Elizabeth Cottrell, Maryjo N. Brounce, Katherine A. Kelley
Expanding the North American Breeding Bird Survey analysis to include additional species and regions Expanding the North American Breeding Bird Survey analysis to include additional species and regions
The North American Breeding Bird Survey (BBS) contains data for >700 bird species, but analyses often focus on a core group of ∼420 species. We analyzed data for 122 species of North American birds for which data exist in the North American Breeding Bird Survey (BBS) database but are not routinely analyzed on the BBS Summary and Analysis Website. Many of these species occur in the...
Authors
John R. Sauer, Daniel Niven, Keith Pardieck, David Ziolkowski, William A. Link
Model-based approaches to deal with detectability: a comment on Hutto (2016) Model-based approaches to deal with detectability: a comment on Hutto (2016)
In a recent paper, Hutto (2016a) challenges the need to account for detectability when interpreting data from point counts. A number of issues with model-based approaches to deal with detectability are presented, and an alternative suggested: surveying an area around each point over which detectability is assumed certain. The article contains a number of false claims and errors of logic...
Authors
Tiago A. Marques, Len Thomas, Marc Kéry, Steve T. Buckland, David L. Borchers, Eric Rexstad, Rachel M. Fewster, Darryl I. MacKenzie, Andy Royle, Gurutzeta Guillera-Arroita, Colleen M. Handel, David C. Pavlacky, Richard J. Camp
Vegetation recovery in tidal marshes reveals critical slowing down under increased inundation Vegetation recovery in tidal marshes reveals critical slowing down under increased inundation
A declining rate of recovery following disturbance has been proposed as an important early warning for impending tipping points in complex systems. Despite extensive theoretical and laboratory studies, this ‘critical slowing down’ remains largely untested in the complex settings of real-world ecosystems. Here, we provide both observational and experimental support of critical slowing...
Authors
Jim van Belzen, Johan van de Koppel, Matthew L. Kirwan, Daphne van der Wal, Peter M. J. Herman, Vasilis Dakos, Sonia Kéfi, Marten Scheffer, Glenn R. Guntenspergen, Tjeerd J. Bouma
Hydrogeologic framework and hydrologic conditions of the Piney Point aquifer in Virginia Hydrogeologic framework and hydrologic conditions of the Piney Point aquifer in Virginia
The Piney Point aquifer in Virginia is newly described and delineated as being composed of six geologic units, in a study conducted by the U.S. Geological Survey in cooperation with the Virginia Department of Environmental Quality (VA DEQ). The eastward-dipping geologic units include, in stratigraphically ascending order, thesand of the Nanjemoy Formation Woodstock Member,interbedded...
Authors
E. Randolph McFarland
Denitrifying woodchip bioreactor and phosphorus filter pairing to minimize pollution swapping Denitrifying woodchip bioreactor and phosphorus filter pairing to minimize pollution swapping
Pairing denitrifying woodchip bioreactors and phosphorus-sorbing filters provides a unique, engineered approach for dual nutrient removal from waters impaired with both nitrogen (N) and phosphorus (P). This column study aimed to test placement of two P-filter media (acid mine drainage treatment residuals and steel slag) relative to a denitrifying system to maximize N and P removal and...
Authors
Laura E. Christianson, Christine Lepine, Philip Sibrell, Chad J. Penn, Steven T. Summerfelt
Performance and application of a fluidized bed limestone reactor designed for control of alkalinity, hardness and pH at the Warm Springs Regional Fisheries Center Performance and application of a fluidized bed limestone reactor designed for control of alkalinity, hardness and pH at the Warm Springs Regional Fisheries Center
Springs serving the Warm Springs Regional Fisheries Center, Warm Springs, Georgia, have pH, alkalinity, and hardness levels thatlie under the range required for successful fish propagation while free CO2 is well above allowable targets. We evaluate a pretreatment process that exploits limestone’s (CaCO3) ability to react away hydrogen ions (H+) and carbon dioxide (CO2) while increasing...
Authors
Barnaby J. Watten, Vincent A. Mudrak, Carlos Echevarria, Philip Sibrell, Steven T. Summerfelt, Claude E. Boyd
Effects of changes in pumping on regional groundwater-flow paths, 2005 and 2010, and areas contributing recharge to discharging wells, 1990–2010, in the vicinity of North Penn Area 7 Superfund site, Montgomery County, Pennsylvania Effects of changes in pumping on regional groundwater-flow paths, 2005 and 2010, and areas contributing recharge to discharging wells, 1990–2010, in the vicinity of North Penn Area 7 Superfund site, Montgomery County, Pennsylvania
A previously developed regional groundwater flow model was used to simulate the effects of changes in pumping rates on groundwater-flow paths and extent of recharge discharging to wells for a contaminated fractured bedrock aquifer in southeastern Pennsylvania. Groundwater in the vicinity of the North Penn Area 7 Superfund site, Montgomery County, Pennsylvania, was found to be...
Authors
Lisa A. Senior, Daniel J. Goode