Publications
These publications showcase the significant science conducted in our Science Centers.
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Character of shell beds flanking Herod Point Shoal, southeastern Long Island Sound, New York Character of shell beds flanking Herod Point Shoal, southeastern Long Island Sound, New York
High biogenic productivity, strong tidal currents, shoal topography, and short transport distances combine to favor shell-bed formation along the lower flanks of a cape-associated shoal off Herod Point on Long Island, New York. This shell bed has a densely packed, clast-supported fabric composed largely of undegraded surf clam (Spisula solidissima) valves. It is widest along the central...
Authors
Lawrence J. Poppe, S. Jeffress Williams, Ivar G. Babb
2-D inner-shelf current observations from a single VHF WEllen RAdar (WERA) station 2-D inner-shelf current observations from a single VHF WEllen RAdar (WERA) station
The majority of High Frequency (HF) radars used worldwide operate at medium to high frequencies (8 to 30 MHz) providing spatial resolutions ranging from 3 to 1.5 km and ranges from 150 to 50 km. This paper presents results from the deployment of a single Very High Frequency (VHF, 48 MHz) WEllen RAdar (WERA) radar with spatial resolution of 150 m and range 10-15 km, used in the nearshore...
Authors
G. Voulgaris, N. Kumar, K.-W. Gurgel, John C. Warner, Jeffrey H. List
Fish community and bioassessment responses to stream network position Fish community and bioassessment responses to stream network position
If organisms move beyond the boundaries of local sampling units, regional metacommunity dynamics could undermine the ability of bioassessment studies to characterize local environmental quality. We tested the prediction that fish dispersal influences local fish community structure and bioassessment metrics as a function of site position within stream networks. We evaluated fish community...
Authors
N.P. Hitt, P. L. Angermeier
Copper localization, elemental content, and thallus colour in the copper hyperaccumulator lichen Lecanora sierrae from California Copper localization, elemental content, and thallus colour in the copper hyperaccumulator lichen Lecanora sierrae from California
An unusual dark blue-green lichen, Lecanora sierrae, was discovered over 30 years ago by Czehura near copper mines in the Lights Creek District, Plumas County, Northern California. Using atomic absorption spectroscopy, Czehura found that dark green lichen samples from Warren Canyon contained 4% Cu in ash and suggested that its colour was due to copper accumulation in the cortex. The...
Authors
O. W. Purvis, J. P. Bennett, J. Spratt
Fluid sources and metallogenesis in the Blackbird Co-Cu-Au-Bi-Y-REE district, Idaho, U.S.A.: Insights from major-element and boron isotopic compositions of tourmaline Fluid sources and metallogenesis in the Blackbird Co-Cu-Au-Bi-Y-REE district, Idaho, U.S.A.: Insights from major-element and boron isotopic compositions of tourmaline
Tourmaline is a widespread mineral in the Mesoproterozoic Blackbird Co–Cu–Au–Bi–Y–REE district, Idaho, where it occurs in both mineralized zones and wallrocks. We report here major-element and B-isotope compositions of tourmaline from stratabound sulfide deposits and their metasedimentary wallrocks, from mineralized and barren pipes of tourmaline breccia, from late barren quartz veins...
Authors
Robert B. Trumbull, John F. Slack, M.-S. Krienitz, Harvey E. Belkin, M. Wiedenbeck
Evaluation of single and two-stage adaptive sampling designs for estimation of density and abundance of freshwater mussels in a large river Evaluation of single and two-stage adaptive sampling designs for estimation of density and abundance of freshwater mussels in a large river
Reliable estimates of abundance are needed to assess consequences of proposed habitat restoration and enhancement projects on freshwater mussels in the Upper Mississippi River (UMR). Although there is general guidance on sampling techniques for population assessment of freshwater mussels, the actual performance of sampling designs can depend critically on the population density and...
Authors
D. R. Smith, J. T. Rogala, B. R. Gray, S. J. Zigler, T.J. Newton
Glacial flour dust storms in the Gulf of Alaska: hydrologic and meteorological controls and their importance as a source of bioavailable iron Glacial flour dust storms in the Gulf of Alaska: hydrologic and meteorological controls and their importance as a source of bioavailable iron
Iron is an essential micronutrient that limits primary productivity in much of the ocean, including the Gulf of Alaska (GoA). However, the processes that transport iron to the ocean surface are poorly quantified. We combine satellite and meteorological data to provide the first description of widespread dust transport from coastal Alaska into the GoA. Dust is frequently transported from...
Authors
John Crusius, A.W. Schroth, S. Gasso, C.M. Moy, R.C. Levy, M. Gatica
Use of the superpopulation approach to estimate breeding population size: An example in asynchronously breeding birds Use of the superpopulation approach to estimate breeding population size: An example in asynchronously breeding birds
Many populations of animals are fluid in both space and time, making estimation of numbers difficult. Much attention has been devoted to estimation of bias in detection of animals that are present at the time of survey. However, an equally important problem is estimation of population size when all animals are not present on all survey occasions. Here, we showcase use of the...
Authors
K.A. Williams, P. C. Frederick, James D. Nichols
Formal and informal trail monitoring protocols and baseline conditions: Great Falls Park and Potomac Gorge. Final research report Formal and informal trail monitoring protocols and baseline conditions: Great Falls Park and Potomac Gorge. Final research report
This report presents the results of research on the conditions of formal and informal (visitorcreated) trails conducted within the Great Falls Park (GFP) portion of George Washington Memorial Parkway (GWMP), Virginia, and the adjacent Maryland portions of the C&O Canal National Historical Park (CHOH). This research was prompted primarily by concerns about the impact of extensive informal...
Authors
Jeremy Wimpey, Jeffrey L. Marion
Industrial diamond Industrial diamond
Estimated world production of natural and synthetic industrial diamond was about 4.44 billion carats in 2010. Natural industrial diamond deposits have been found in more than 35 countries, and synthetic industrial diamond is produced in at least 15 countries.
Authors
D.W. Olson
Gemstones Gemstones
The estimated value of natural gemstones produced from U.S. deposits during 2010 was $8.5 million, a slight increase from 2009. U.S. gemstone production included agate, amber, beryl, coral, garnet, jade, jasper, opal, pearl, quartz, sapphire, shell, topaz, tourmaline, turquoise and many other gem materials.
Authors
D.W. Olson