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Oliver Ranch Science School Complex & Wild Horse And Burro Facility: Final Close-Out Report, Margaret N. Rees
Oliver Ranch Science School Complex & Wild Horse And Burro Facility: Final Close-Out Report, Margaret N. Rees
Oliver Ranch Project
“The mission of the Red Rock Desert Learning Center is to instill stewardship and respect by increasing knowledge and understanding of the Mojave Desert ecosystems and cultures through a unique experiential discovery program.”
Spatial Analysis Of Substantiated Child Maltreatment In Metro Atlanta, Georgia, Yueqin Zhou
Spatial Analysis Of Substantiated Child Maltreatment In Metro Atlanta, Georgia, Yueqin Zhou
Geosciences Theses
Identifying high-risk areas for child maltreatment to ultimately aid public health agencies for interventions is necessary for protecting children at high risk. Rates of substantiated neglect and physical/emotional abuse in 2000-2002 are computed for the census tracts in the urban area of five counties in Metro Atlanta, Georgia, and analyzed using spatial regression to determine their relationships with twelve risk variables computed from the Vital Records births and the 2000 Census data. After accounting for multicollinearity among risk variables and spatial autocorrelation among observations for neighboring locations, it is found that high percentages of (1) births to non-married mothers, (2) …
Deep-Water Antipatharians: Proxies Of Environmental Change, B. Williams, M.J. Risk, S.W. Ross, K.J. Sulak
Deep-Water Antipatharians: Proxies Of Environmental Change, B. Williams, M.J. Risk, S.W. Ross, K.J. Sulak
United States Geological Survey: Staff Publications
Deep-water (307–697 m) antipatharian (black coral) specimens were collected from the southeastern continental slope of the United States and the north-central Gulf of Mexico. The sclerochronology of the specimens indicates that skeletal growth takes place by formation of concentric coeval layers. We used 210Pb to estimate radial growth rate of two specimens, and to establish that they were several centuries old. Bands were delaminated in KOH and analyzed for carbon and nitrogen stable isotopes. Carbon values ranged from _16.4‰ to _15.7‰; the oldest specimen displayed the largest range in values. Nitrogen values ranged from 7.7‰ to 8.6‰. …
Biomarker And Stable Isotope Characterization Of Coastal Pond Organic Matter, Mcmurdo Dry Valleys, Antarctica, Melissa Margaret Hage
Biomarker And Stable Isotope Characterization Of Coastal Pond Organic Matter, Mcmurdo Dry Valleys, Antarctica, Melissa Margaret Hage
Masters Theses
Small coastal ponds containing photosynthetic microbial mat communities represent a potentially significant source of labile organic carbon within the McMurdoDryValleys, Antarctica. To distinguish coastal pond derived organic matter (CPDOM) from other sources of organic matter in the dry valleys, I investigated bulk organic carbon and nitrogen isotopic signatures and phospholipid fatty acid (PLFA) profiles of benthic microbial mats located at two sites, HjorthHillCoastand GarwoodValley. The average δ13C values at Hjorth Hill Coast and Garwood Valley are -10.91 ‰ and -10.19 ‰, respectively. The average δ15N values are 3.73 ‰ and -1.25 ‰, respectively. Microbial mats from …
A Preliminary Benthic Invertebrate Study Of Jun Jaegyu Volcano : An Undersea Volcano In Antarctic Sound, Antarctica, Gina QuiñOnes
A Preliminary Benthic Invertebrate Study Of Jun Jaegyu Volcano : An Undersea Volcano In Antarctic Sound, Antarctica, Gina QuiñOnes
Theses, Dissertations and Culminating Projects
Jun Jaegyu volcano, an Antarctic submarine volcano, was dredged in May 2004 for sediment and marine macroinvertebrates. The objectives of this study were to examine the benthic assemblages and biodiversity present on the newly discovered volcano. The volcano is located on the continental shelf of the northeastern Antarctic Peninsula, where recent changes in surface temperature and ice shelf stability have been observed. This volcano was swath-mapped during cruise 01 -07 of the Research Vessel-Ice Breaker Nathaniel B. Palmer. The volcano was studied using a SCUD video camera and a dredge along the flanks and crest. Results indicate a seafloor surface …
Spring Census Of Mid-Continent Sandhill Cranes Using Aerial Infrared Videography, Paul Kinzel, Jonathan Nelson, Randolph Parker, Lawrence Davis
Spring Census Of Mid-Continent Sandhill Cranes Using Aerial Infrared Videography, Paul Kinzel, Jonathan Nelson, Randolph Parker, Lawrence Davis
United States Geological Survey: Staff Publications
Aerial infrared videography was used to map spatial distributions of nocturnal sandhill crane (Grus canadensis) flocks and determine crane densities within roosts as an alternative to the currently used diurnal photo-corrected ocular transect method to estimate the size of the midcontinental population. The densities determined from samples taken over the course of a night show variability. Densities measured early in the night (2100 to 2300 hrs) were generally lower than those measured in the time period after midnight and up until cranes prepared to depart their roosts before sunrise. This suggests that cranes may be more active early …
Salt Ingestion Caves, Charles A. Lundquist, William W. Varnedoe Jr.
Salt Ingestion Caves, Charles A. Lundquist, William W. Varnedoe Jr.
International Journal of Speleology
Large vertebrate herbivores, when they find a salt-bearing layer of rock, say in a cliff face, can produce sizable voids where, over generations, they have removed and consumed salty rock. The cavities formed by this natural animal process constitute a unique class of caves that can be called salt ingestion caves. Several examples of such caves are described in various publications. An example in Mississippi U.S.A., Rock House Cave, was visited by the authors in 2000. It seems to have been formed by deer or bison. Perhaps the most spectacular example is Kitum Cave in Kenya. This cave has been …
Bioreactivity Of Estuarine Dissolved Organic Matter: A Combined Geochemical And Microbiological Approach, Sl Mccallister, Je Bauer, Elizabeth A. Canuel
Bioreactivity Of Estuarine Dissolved Organic Matter: A Combined Geochemical And Microbiological Approach, Sl Mccallister, Je Bauer, Elizabeth A. Canuel
VIMS Articles
An integrated multidisciplinary study utilizing geochemical and microbial ecological approaches was conducted to characterize the origins, chemical nature, and quantities of dissolved and particulate organic matter (OM) utilized by heterotrophic bacteria in a temperate estuary. C: N, stable isotope (delta C-13), and lipid biomarker analyses revealed differences in the inferred reactivity of autochthonous versus allochthonous OM sources. Isotopic comparison of OM size fractions and bacterial nucleic acids suggests that high-molecular-weight dissolved OM (DOM) is consistently linked to bacterial biomass synthesis along the estuarine salinity gradient. Polyunsaturated fatty acids (as percent of total fatty acids, FA) were a reliable predictor of …