Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16746
Robustness of closed capture-recapture methods to violations of the closure assumption Robustness of closed capture-recapture methods to violations of the closure assumption
Closed-population capture–recapture methods have been used extensively in animal ecology, both by themselves and within the context of Pollock’s robust design and multistate models, to estimate various parameters of population and community dynamics. The defining assumption of geographic and demographic closure (i.e., no births, deaths, immigration, or emigration) for the duration of...
Authors
William L. Kendall
Time-series photographs of the sea floor in western Massachusetts Bay: June - October, 1996 Time-series photographs of the sea floor in western Massachusetts Bay: June - October, 1996
No abstract available.
Authors
Bradford Butman, John Evans, William Lange, Chris F. Polloni
Hydrogeomorphic factors and ecosystem responses in coastal wetlands of the Great Lakes Hydrogeomorphic factors and ecosystem responses in coastal wetlands of the Great Lakes
Gauging the impact of manipulative activities, such as rehabilitation or management, on wetlands requires having a notion of the unmanipulated condition as a reference. And understanding of the reference condition requires knowledge of dominant factors influencing ecosystem processes and biological communities. In this paper, we focus on natural physical factors (conditions and processes...
Authors
J.R. Keough, T.A. Thompson, G.R. Guntenspergen, D.A. Wilcox
A geochemical isotopic (Nd-Pb) comparison of volcanic rocks erupted during the last 3,550 yrs. B.P. of interplinian activity of Somma-Vesuvius Volcano, southern Italy A geochemical isotopic (Nd-Pb) comparison of volcanic rocks erupted during the last 3,550 yrs. B.P. of interplinian activity of Somma-Vesuvius Volcano, southern Italy
No abstract available.
Authors
Renato Somma, Robert A. Ayuso, B. de Vivo
Mississippi Basin Carbon Project; upland soil database for sites in Yazoo Basin, northern Mississippi Mississippi Basin Carbon Project; upland soil database for sites in Yazoo Basin, northern Mississippi
The conversion of land from its native state to an agricultural use commonly results in a significant loss of soil carbon (Mann, 1985; Davidson and Ackerman, 1993). Globally, this loss is estimated to account for as much as 1/3 of the net CO2 emissions for the period of 1850 to 1980 (Houghton et al, 1983). Roughly 20 to 40 percent of original soil carbon is estimated to be lost as CO2 as...
Authors
J.W. Harden, T. L. Fries, T.G. Huntington
Great earthquakes, abundant sand, and high wave energy in the Columbia Cell, USA Great earthquakes, abundant sand, and high wave energy in the Columbia Cell, USA
No abstract available.
Authors
Curt D. Peterson, Guy R. Gelfenbaum, Harry M. Jol, Jim B. Phipps, Frank Reckendorf, Dave C. Twichell, Sandy Vanderberg, Lorraine Woxell
Pennsylvania Pennsylvania
No abstract available
Authors
Water Resources Division U.S. Geological Survey
Cobalt-rich ferromanganese crusts in the Pacific Cobalt-rich ferromanganese crusts in the Pacific
Co-rich Fe-Mn crusts occur throughout the Pacific on seamounts, ridges, and plateaus where currents have kept the rocks swept clean of sediments at least intermittently for millions of years. Crusts precipitate out of cold ambient sea water onto hard-rock substrates forming pavements up to 250 mm thick. Crusts are important as a potential resource for Co, Ni, Pt, Mn, Tl, Te, and other...
Authors
James R. Hein, Andrea Koschinsky, Michael Bau, Frank T. Manheim, Jung-Keuk Kang, Leanne Roberts
Seismic reflections identify finite differences in gas hydrate resources Seismic reflections identify finite differences in gas hydrate resources
Gas hydrate is a gas-bearing, ice-like crystalline solid. The substance's build ing blocks consist of a gas molecule (generally methane) sur-rounded by a cage of water molecules. The total amount of methane in hydrate in the world is immense - the most recent speculative estimate centers on values of 21x1015 cu meters. Thus, it may represent a future energy resource. This estimate was...
Authors
William P. Dillon, M. Max
Anoxia pre-dates Frasnian–Famennian boundary mass extinction horizon in the Great Basin, USA Anoxia pre-dates Frasnian–Famennian boundary mass extinction horizon in the Great Basin, USA
Major and trace metal results from three Great Basin stratigraphic sections with strong conodont biostratigraphy identify a distinct anoxic interval that precedes, but ends approximately 100 kyr before, the Frasnian–Famennian (F–F, mid-Late Devonian) boundary mass extinction horizon. This horizon corresponds to the final and most severe step of a more protracted extinction period. These...
Authors
John F. Bratton, William B. N. Berry, Jared R. Morrow
Evaluation of geophysical logs, Phase II, at Willow Grove Naval Air Station Joint Reserve Base, Montgomery County, Pennsylvania Evaluation of geophysical logs, Phase II, at Willow Grove Naval Air Station Joint Reserve Base, Montgomery County, Pennsylvania
Between March and April 1998, the U.S. Navy contracted Tetra Tech NUS Inc., to drill two monitor wells in the Stockton Formation at the Willow Grove Naval Air Station Joint Reserve Base, Horsham Township, Montgomery County, Pa. The wells MG-1634 and MG-1635 were installed to monitor water levels and sample contaminants in the shallow, intermediate, and deep water-producing zones of the...
Authors
Randall W. Conger
The effect of dietary protein and lipid source on dorsal fin erosion rainbow trout, Oncorhynchus mykiss The effect of dietary protein and lipid source on dorsal fin erosion rainbow trout, Oncorhynchus mykiss
A study was conducted to determine the effect of dietary protein and lipid source on dorsal fin erosion in rainbow trout. Seven diets were each fed to four replicate lots of 300 first-feeding fry cultured in 75 l aluminum troughs for 8 weeks. Two basal diets were manufactured with approximately equal nutrient content, one using krill and squid meals and the other anchovy meal as the...
Authors
Frederic T. Barrows, William A. Lellis