Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16785
Record of late Pleistocene glaciation and deglaciation in the southern Cascade Range. I. Petrological evidence from lacustrine sediment in Upper Klamath Lake, southern Oregon
Petrological and textural properties of lacustrine sediments from Upper Klamath Lake, Oregon, reflect changing input volumes of glacial flour and thus reveal a detailed glacial history for the southern Cascade Range between about 37 and 15 ka. Magnetic properties vary as a result of mixing different amounts of the highly magnetic, glacially generated detritus with less magnetic, more weathered det
Authors
R. L. Reynolds, J. G. Rosenbaum, J. Rapp, M.W. Kerwin, J.P. Bradbury, S. Colman, D. Adam
Influence of northwest Pacific productivity on North Pacific Intermediate Water oxygen concentrations during the Bølling-Ållerød interval (14.7-12.9 ka)
Elevated productivity in the northwest Pacific is suggested as a new possible control driving past intervals of low-O2 intermediate water along the western continental margin of North America. According to this mechanism, O2 consumption would occur near the site of formation of North Pacific Intermediate Water (NPIW), due to increased respiration of organic carbon in response to a high-productivit
Authors
John Crusius, Thomas F. Pedersen, Stephanie Kienast, Lloyd D. Keigwin, Laurent Labeyrie
Pyroclastic flow hazard at Volcán Citlaltépetl
Volcán Citlaltépetl (Pico de Orizaba) with an elevation of 5,675 m is the highest volcano in North America. Its most recent catastrophic events involved the production of pyroclastic flows that erupted approximately 4,000, 8,500, and 13,000 years ago. The distribution of mapped deposits from these eruptions gives an approximate guide to the extent of products from potential future eruptions. Becau
Authors
Michael F. Sheridan, Bernard E. Hubbard, Gerardo Carrasco-Nunez, Claus Siebe
Modeling interpopulation dispersal by banner-tailed kangaroo rats
Many metapopulation models assume rules of population connectivity that are implicitly based on what we know about within-population dispersal, but especially for vertebrates, few data exist to assess whether interpopulation dispersal is just within-population dispersal "scaled up." We extended existing multi-stratum mark-release-recapture models to incorporate the robust design, allowing us to co
Authors
J.L. Skvarla, J. D. Nichols, J. E. Hines, P.M. Waser
Estimating site occupancy and species detection probability parameters for terrestrial salamanders
Recent, worldwide amphibian declines have highlighted a need for more extensive and rigorous monitoring programs to document species occurrence and detect population change. Abundance estimation methods, such as mark-recapture, are often expensive and impractical for large-scale or long-term amphibian monitoring. We apply a new method to estimate proportion of area occupied using detection/nondete
Authors
L.L. Bailey, T.R. Simons, K. H. Pollock
Accuracy of a pulse-coherent acoustic Doppler profiler in a wave-dominated flow
The accuracy of velocities measured by a pulse-coherent acoustic Doppler profiler (PCADP) in the bottom boundary layer of a wave-dominated inner-shelf environment is evaluated. The downward-looking PCADP measured velocities in eight 10-cm cells at 1 Hz. Velocities measured by the PCADP are compared to those measured by an acoustic Doppler velocimeter for wave orbital velocities up to 95 cm s-1 and
Authors
J.R. Lacy, C. R. Sherwood
Organochlorine pesticides and thiamine in eggs of largemouth bass and American alligators and their relationship with early life-stage mortality
Thiamine deficiency has been linked to early mortality syndrome in salmonids in the Great Lakes. This study was conducted to compare thiamine concentrations in American alligators (Alligator mississippiensis) and Florida largemouth bass (Micropterus salmoides floridanus) eggs from sites with high embryo mortality and high exposure to organochlorine pesticides (OCPs) (Lakes Apopka and Griffin, and
Authors
M. S. Sepulveda, J.J. Wiebe, D. C. Honeyfield, H.R. Rauschenberger, J. P. Hinterkopf, W.E. Johnson, T. S. Gross
Isolation and characterization of mycobacteria from striped bass Morone saxatilis from the Chesapeake Bay
Mycobacteriosis in striped bass Morone saxatilis of Chesapeake Bay, USA, was first diagnosed in 1997 based on the presence of granulomatous inflammation and acid-fast bacteria in skin and spleen. To confirm histopathology, bacteriological detection and identification of mycobacteria were begun using splenic tissue from fish with and without skin ulcerations. On the basis of initial studies using a
Authors
M. W. Rhodes, H. Kator, I. Kaattari, D. Gauthier, W. Vogelbein, C. A. Ottinger
VEMAP Phase 2 bioclimatic database. I. Gridded historical (20th century) climate for modeling ecosystem dynamics across the conterminous USA
Analysis and simulation of biospheric responses to historical forcing require surface climate data that capture those aspects of climate that control ecological processes, including key spatial gradients and modes of temporal variability. We developed a multivariate, gridded historical climate dataset for the conterminous USA as a common input database for the Vegetation/Ecosystem Modeling and Ana
Authors
T.G.F. Kittel, N.A. Rosenbloom, J. Andrew Royle, Christopher Daly, W.P. Gibson, H.H. Fisher, P. Thornton, D.N. Yates, S. Aulenbach, C. Kaufman, R. McKeown, D. Bachelet, D. S. Schimel, R. Neilson, J. Lenihan, R. Drapek, D.S. Ojima, W.J. Parton, J. M. Melillo, D. W. Kicklighter, H. Tian, A. D. McGuire, M.T. Sykes, B. Smith, S. Cowling, T. Hickler, I.C. Prentice, S. Running, K.A. Hibbard, W.M. Post, A.W. King, T. Smith, B. Rizzo, F.I. Woodward
Bioturbation depths, rates and processes in Massachusetts Bay sediments inferred from modeling of 210Pb and 239 + 240Pu profiles
Profiles of 210Pb and 239 + 15 cm depth or that biodiffusive mixing mediated by other organisms is occurring at depth. Additional constraints from surficial sediment 234Th data suggest that in this half of the cores, the vast majority of the present-day flux of recent, nuclide-bearing material to these core sites is transported over a timescale of a month or more to a depth of a few centimeters be
Authors
John Crusius, Michael H. Bothner, Christopher K. Sommerfield
Ultrastructure of Mycobacterium marinum granuloma in striped bass Morone saxatilis
An emerging epizootic of mycobacteriosis currently threatens striped bass Morone saxatilis populations in Chesapeake Bay, USA. Several species of mycobacteria, including Mycobacterium marinum, species resembling M. avium, M. gordonae, M. peregrinum, M. scrofulaceum and M. terrae, and the new species M. shottsii have been isolated from diseased and healthy bass. In this study, we describe the ultra
Authors
David T. Gauthier, W. K. Vogelbein, C. A. Ottinger
Myxobolus cerebralis internal transcribed spacer 1 (ITS-1) sequences support recent spread of the parasite to North America and within Europe
Molecular approaches for resolving relationships among the Myxozoa have relied mainly on small subunit (SSU) ribosomal DNA (rDNA) sequence analysis. This region of the gene is generally used for higher phylogenetic studies, and the conservative nature of this gene may make it inadequate for intraspecific comparisons. Previous intraspecific studies of Myxobolus cerebralis based on molecular analyse
Authors
Christopher M. Whipps, M. El-Matbouli, R.P. Hedrick, V. Blazer, M.L. Kent