Publications
Publications intro.
Filter Total Items: 446
Anthropocene streams and base-level controls from historic dams in the unglaciated mid-Atlantic region, USA
Recently, widespread valley-bottom damming for water power was identified as a primary control on valley sedimentation in the mid-Atlantic US during the late seventeenth to early twentieth century. The timing of damming coincided with that of accelerated upland erosion during post-European settlement land-use change. In this paper, we examine the impact of local drops in base level on incision int
Authors
Dorothy Merritts, Robert Walter, Michael Rahnis, Jeff Hartranft, Scott Cox, Allen Gellis, Noel Potter, William Hilgartner, Michael J. Langland, Lauren Manion, Caitlin Lippincott, Sauleh Siddiqui, Zain Rehman, Chris Scheid, Laura Kratz, Andrea Shilling, Matthew Jenschke, Katherine Datin, Elizabeth Cranmer, Austin Reed, Derek Matuszewski, Mark Voli, Erik Ohlson, Ali Neugebauer, Aakash Ahamed, Conor Neal, Allison Winter, Steven Becker
Demographic consequences of migratory stopover: Linking red knot survival to horseshoe crab spawning abundance
Understanding how events during one period of the annual cycle carry over to affect survival and other fitness components in other periods is essential to understanding migratory bird demography and conservation needs. Previous research has suggested that western Atlantic red knot (Calidris canutus rufa) populations are greatly affected by horseshoe crab (Limulus polyphemus) egg availability at De
Authors
Conor P. McGowan, James E. Hines, James D. Nichols, James E. Lyons, David Smith, Kevin S. Kalasz, Lawrence J. Niles, Amanda D. Dey, Nigel A. Clark, Philip W. Atkinson, Clive D.T. Minton, William Kendall
Pathogenic bacteria and microbial-source tracking markers in Brandywine Creek Basin, Pennsylvania and Delaware, 2009-10
The City of Wilmington, Delaware, is in the downstream part of the Brandywine Creek Basin, on the main stem of Brandywine Creek. Wilmington uses this stream, which drains a mixed-land-use area upstream, for its main drinking-water supply. Because the stream is used for drinking water, Wilmington is in need of information about the occurrence and distribution of specific fecally derived pathogenic
Authors
Joseph W. Duris, Andrew G. Reif, Leif E. Olson, Heather E. Johnson
Beach characteristics mitigate effects of onshore wind on horseshoe crab spawning: Implications for matching with shorebird migration in Delaware Bay
Disruption of food availability by unfavorable physical processes at energetically demanding times can limit recruitment of migratory species as predicted by the match–mismatch hypothesis. Identification and protection of disruption‐resistant habitat could contribute to system resilience. For example, horseshoe crab Limulus polyphemus spawning and shorebird stopover must match temporally in Delawa
Authors
D. R. Smith, N.L. Jackson, K.F. Nordstrom, R.G. Weber
Age and sex specific timing, frequency, and spatial distribution of horseshoe crab spawning in Delaware Bay: Insights from a large-scale radio telemetry array
To study horseshoe crab Limulus polyphemus spawning behavior and migration over a large-spatial extent (>100 km), we arrayed fixed station radio receivers throughout Delaware Bay and deployed radio transmitters and archival tags on adult horseshoe crabs prior to their spawning season. We tagged and released 160 females and 60 males in 2004 and 217 females in 2005. The array covered approximately 1
Authors
David R. Smith, L. J. Brousseau, Mary T. Mandt, Michael J. Millard
Prevalence of antibodies to type A influenza virus in wild avian species using two serologic assays
Serologic testing to detect antibodies to avian influenza (AI) virus has been an underused tool for the study of these viruses in wild bird populations, which traditionally has relied on virus isolation and reverse transcriptase-polymerase chain reaction (RT-PCR). In a preliminary study, a recently developed commercial blocking enzyme-linked immunosorbent assay (bELISA) had sensitivity and specifi
Authors
Justin D. Brown, M. Page Luttrell, Roy D. Berghaus, Whitney Kistler, Shamus P. Keeler, Andrea Howey, Benjamin Wilcox, Jeffrey S. Hall, Larry Niles, Amanda Dey, Gregory Knutsen, Kristen Fritz, David E. Stallknecht
Landscape indicators and land cover change in the Mid-Atlantic Region of the United States, 1973-2001
Landscape indicators, derived from land use and land cover data as well as other data, were used to calculate the ecological consequences of land cover change in terms of nitrate loading and physical bird habitat. Both were modeled from 1973, 1992, and 2001 land cover data in the Mid-Atlantic region of the United States. Land cover statistics and trends are calculated for three time periods. In ge
Authors
E. Terrence Slonecker, Lesley Milheim, Peter R. Claggett
Simulated impacts of artificial groundwater recharge and discharge of the source area and source volume of an Atlantic Coastal Plain Stream, Delaware, USA
A numerical groundwater-flow model was used to characterize the source area and volume of Phillips Branch, a baseflow-dominated stream incising a highly permeable unconfined aquifer on the low relief Delmarva Peninsula, USA. Particle-tracking analyses indicate that the source area (5.51 km2) is ~20% smaller than the topographically defined watershed (6.85 km2), and recharge entering ~37% of the su
Authors
Joshua W. Kasper, Judish M. Denver, Thomas E. McKenna, William J. Ullman
Occurrence and distribution of organic chemicals and nutrients and comparison of water-quality data from public drinking-water supplies in the Columbia aquifer in Delaware, 2000-08
The U.S. Geological Survey, in cooperation with the Delaware Department of Natural Resources and Environmental Control and the Delaware Geological Survey, conducted a groundwater-quality investigation to (a) describe the occurrence and distribution of selected contaminants, and (b) document any changes in groundwater quality in the Columbia aquifer public water-supply wells in the Coastal Plain in
Authors
Betzaida Reyes
Water-level conditions in selected confined aquifers of the New Jersey and Delaware Coastal Plain
No abstract available
Authors
Vincent T. DePaul, Robert Rosman, Pierre Lacombe
Water-level conditions in selected confined aquifers of the New Jersey and Delaware coastal plain, 2003
The Coastal Plain aquifers of New Jersey provide an important source of water for more than 2 million people. Steadily increasing withdrawals from the late 1800s to the early 1990s resulted in declining water levels and the formation of regional cones of depression. In addition to decreasing water supplies, declining water levels in the confined aquifers have led to reversals in natural hydraulic
Authors
Vincent T. DePaul, Robert Rosman, Pierre J. Lacombe
Comparison of two cell lysis procedures for recovery of microcystins in water samples from silver lake in Dover, Delaware, with microcystin producing cyanobacterial accumulations
A collaboration was developed between Abraxis, LLC, the State of Delaware Department of Natural Resources and Environmental Control Division of Water Resources Environmental Laboratory, the University of Delaware, and the United States Geological Survey to investigate the efficacy of the QuikLyse procedure developed by Abraxis, LLC as an alternative cell-lysis technique suitable for use with an ex
Authors
Keith A. Loftin, Michael T. Meyer, Fernando Rubio, Lisa Kamp, Edythe Humphries, Ed Whereat