USFWS selected geographic analyses
Floyd O. Stayner, James D. Scurry, James B. Johnston, Mary C. Watzin, Pasquale F. Roscigno
1991, Conference Paper, Coastal zone '91: Proceedings of the seventh symposium on coastal and ocean management
The geographic information system (GIS) used by the National Wetlands Research Center (NWRC) of the U.S. Fish and Wildlife Service has been valuable in assisting natural resource managers in planning and managing coastal fish and wildlife resources. In the past 5 years, NWRC has conducted about 60 studies employing this...
Estimating wintering Bald Eagle densities in the Mississippi Alluvial Valley
Mike Brown, James R. Nassar
1991, Journal of Raptor Research 40-42
Surveys on the winter distribution of Bald Eagles have been concentrated in the northern USA (Hastings 1988, Mattson 1988), where Bald Eagles are most common. Few density estimates for wintering Bald Eagles exist. In the past, different survey techniques with little standardization have been used. Statistical analyses and error measurements of existing winter survey...
Global climate change: USFWS coastal research
Janet R. Keough, Thomas W. Doyle, Robert E. Stewart Jr.
1991, Conference Paper, Coastal zone '91 : Proceedings of the seventh symposium on coastal and ocean management
Scenarios of global climate change are still ambiguous; however, increasing sea level and atmospheric carbon dioxide (CO2) concentrations seem certain, although rates of change are still being debated. Predictions for other aspects of climate change, such as temperature, tropical storm frequency and intensity, and precipitation, are still in debate, and...
Remote sensing of water quality
Elijah Ramsey III, John R. Jensen
1991, Conference Paper, 1991 ACSM-ASPRS Annual Convention, Baltimore, MD, Mar. 25-29, 1991, Technical Papers. Vol. 3 - Remote Sensing
Water property data were collected within 3 cooling water reservoirs (active to inactive, large [1,068 ha] to small [68.6 ha]. oligotrophic to eutrophic) at 31 locations. A description of the water characteristics was obtained including algal pigments, total suspended particles, dissolved and particulate organic matter, and total particle absorption spectra....
Reproductive outcomes in colonial fish-eating birds: A biomarker for developmental toxicants in Great Lakes food chains: I. Historical and ecotoxicological perspectives
Glen Fox, D. V. Weseloh, Timothy J. Kubiak, Thomas C. Erdman
1991, Journal of Great Lakes Research (17) 153-157
Colonial fish-eating birds have been used as convenient model populations in which to study the impact of chronic exposure to complex mixtures of persistent lipophilic environmental contaminants within the Great Lakes ecosystem. To date, published reports of contaminant-induced adverse reproductive outcomes exist for six species. We briefly review the studies...
Reproductive outcomes in colonial fish-eating birds: A biomarker for developmental toxicants in Great Lakes food chains: II. Spatial variation in the occurrence and prevalence of bill defects in young double-crested cormorants in the Great Lakes, 1979–1987
Glen Fox, Brian Collins, Ellen Hayakawa, D. V. Weseloh, James P. Ludwig, Timothy J. Kubiak, Thomas C. Erdman
1991, Journal of Great Lakes Research (17) 158-167
Congenital malformations are relatively uncommon in most wild bird populations. Here we document the occurrence of bill malformations in double-crested cormorant (Phalacrocorax auritus) chicks from colonies in Green Bay and elsewhere in the Great Lakes and in reference areas off the Great Lakes, in the years 1979 through 1987. In...
Effects of site, landscape features, and fire regime on vegetation patterns in presettlement southern Wisconsin
Lawrence A. Leitner, Christopher P. Dunn, Glenn R. Guntenspergen, F. Stearns, David M. Sharpe
1991, Landscape Ecology (5) 203-217
The presettlement tree cover (1831–33) of 3 townships in a southern Wisconsin landscape was analyzed using original survey records. Four forest types were identified: closed forest, open forest, savanna, and prairie. Comparisons of vegetation types and landscape pattern were made between the east and west sides of the Pecatonica River,...
Incubation rhythm components for three Cinnamon Teal nesting in California
William L. Hohman
1991, Prairie Naturalist (23) 229-234
No abstract available....
Geologic map of the Adelphia and Farmingdale quadrangles, Monmouth and Ocean Counties, New Jersey
Peter J. Sugarman, James P. Owens, Laurel M. Bybell
1991, New Jersey Geological Survey Map Series 91-1
No abstract available....
The second Lehigh Tunnel; geology and the New Austrian Tunnelling Method
Jack B. Epstein, Patricia F. Buis
1991, Pennsylvania Geology (22) 2-9
No abstract available....
Seasonal changes in microhabitat selection by rainbow trout in a small stream
Donald M. Baltz, Bruce C. Vondracek, Larry R. Brown, Peter B. Moyle
1991, Transactions of the American Fisheries Society (120) 166-176
Shifts in microhabitat selection by rainbow trout Oncorhynchus mykiss were related to seasonal and ontogenetic factors in a small stream characterized by short riffles, small pools, and boulder substrate. Resource availability did not differ significantly between summer and November sampling dates for most variables related to water velocity, substrate, and cover, although...
Evaluation of wetland development and waterbird response at Elk Creek Wildlife management area, Lake Mills, Iowa, 1961 to 1990
M.W. Weller, G.W. Kaufmann, P.A. Vohs
1991, Wetlands (11) 245-262
A waterfowl habitat development project along 7.5 miles (12.07 km) of stream was evaluated after 27 years. There was a modest 12% net increase in wetlands in impounded areas, but much of the wetland vegetation changed from seasonally flooded, nonpersistent and persistent emergents to shallow, open-water areas. An unimpounded, downstream reference area...
Transient eddy formation around headlands
Richard P. Signell, W. Rockwell Geyer
1991, Journal of Geophysical Research (96) 2561-2575
Eddies with length scales of 1-10 km are commonly observed in coastal waters and play an important role in the...
Rockslides on the Terminus of "Jokulsargilsjokull", Southern Iceland
Oddur Sigurdsson, Richard S. Williams Jr.
1991, Geografiska Annaler, Series A: Physical Geography (73) 129-140
On 10 November 1976, a 1.5 km × 0.5 km rockslide deposit on the surface of an unnamed outlet glacier of Mýrdalsjökull ice cap, southern Iceland, was observed from an aircraft. Deposits from two different rockslides, including the larger one observed on 10 November 1976, were visible on a 10...
Wave processes and geologic responses on the floor of the Yellow Sea
James S. Booth, William J. Winters
1991, Book chapter, From shoreline to abyss: Contributions in marine geology in honor of Francis Parker Shepard
The floor of the Yellow Sea is a geologically mundane surface: it is nearly horizontal, lacks relief, and, with few exceptions, is devoid of conspicuous geomorphologic features. However, it is the principal repository for the prodigious sediment load of the Huanghe (Yellow River); and, due to its inherent shallowness (average...
The West Antarctic Rift system: A review of geophysical investigations
J. C. Behrendt, W.E. LeMasurier, A. K. Cooper, Franz Tessensohn, A. Trehu, D. Damaske
D.H. Elliot, editor(s)
1991, Book chapter, Contributions to Antarctic Research II
No abstract available....
A reinterpretation of the timing, position, and significance of part of the Sacramento Mountains detachment fault, southeastern California
Carol Simpson, Janet Schweitzer, Keith A. Howard
1991, GSA Bulletin (103) 751-761
A contact previously considered to be part of the Sacramento Mountains detachment fault (SDF), exposed in the Sacramento Mountains metamorphic core complex, is reinterpreted as an unconformity between Tertiary rhyolite of Eagle Peak and cataclastically deformed crystalline lower-plate rocks. This reinterpretation is based on outcrop-scale topographic relief and the absence...
Numerical simulations of hydrothermal circulation resulting from basalt intrusions in a buried spreading center
A.T. Fisher, T.N. Narasimhan
1991, Earth and Planetary Science Letters (103) 100-115
A two-dimensional, one by two-kilometer section through the seafloor was simulated with a numerical model to investigate coupled fluid and heat flow resulting from basalt intrusions in a buried spreading center. Boundary and initial conditions and physical properties of both sediments and basalt were constrained by field surveys and drilling...
An axial view of a metamorphic core complex: Crustal structure of the Whipple and Chemehuevi Mountains, southeastern California
J. M. Wilson, Jill McCarthy, R.A. Johnson, Keith A. Howard
1991, Journal of Geophysical Research B: Solid Earth (96) 12293-12311
A 135‐km‐long, NW‐SE trending, seismic refraction/wide‐angle reflection profile provides a unique along‐strike view of the crustal structure of a belt of metamorphic core complexes in southeastern California: the Whipple, Chemehuevi, and Sacramento mountains metamorphic core complexes. Interpretation of the seismic data was done by two‐dimensional forward modeling of travel times...
The distribution of seabirds and fish in relation to ocean currents in the southeastern Chukchi Sea
John F. Piatt, John L. Wells, Andrea MacCharles, Brian S. Fadely
W.A. Montevecchi, A.J. Gaston, editor(s)
1991, Conference Paper, Studies of high-latitude seabirds. 1. Behavioural, energetic, and oceanographic aspects of seabird feeding ecology (Occasional Paper 68 of the Canadian Wildlife Service)
In late August 1988, we studied the distribution of seabirds in the southeastern Chukchi Sea, particularly in waters near a major seabird colony at Cape Thompson. Foraging areas were characterized using hydrographic data obtained from hydroacoustic surveys for fish. Murres (Uria spp.) and Black-legged Kitttiwakes Rissa tridactyla breeding at Cape Thompson...
Sensitivity of greenback cutthroat trout to acidic pH and elevated aluminum
D. F. Woodward, Aida M. Farag, E. E. Little, B. L. Steadman, R. Yancik
1991, Transactions of the American Fisheries Society (120) 34-42
The greenback cutthroat trout Oncorhynchus clarki stomias is a threatened subspecies native to the upper South Platte and Arkansas rivers between Denver and Fort Collins, Colorado, an area also susceptible to acid deposition. In laboratory studies, we exposed this subspecies to nominal pHs of 4.5–6.5 and to nominal aluminum concentrations of 0,...
Geochemical evolution of acidic ground water at a reclaimed surface coal mine in western Pennsylvania
Charles A. Cravotta III,
1991, Conference Paper, Proceedings American Society of Mining and Reclamation, 1991
Concentrations of dissolved sulfate and acidity in ground water increase downflow in mine spoil and underlying bedrock at a reclaimed surface coal mine in the bituminous field of western Pennsylvania. Elevated dissolved sulfate and negligible oxygen in ground water from bedrock about 100 feet below the water table suggest that...
Modes of cross-shore sediment transport on the shoreface of the Middle Atlantic Bight
L.D. Wright, John D. Boon, S.C. Kim, J. H. List
1991, Marine Geology (96) 19-51
The mechanisms responsible for onshore and offshore sediment fluxes across the shoreface zone seaward of the surf zone were examined in a 3-year field study. The study was conducted in the southern part of the Middle Atlantic Bight in the depth region 7–17 m using instrumented tripods supporting electromagnetic current...
The world landslide problem
E. E. Brabb
1991, Episodes (14) 52-61
Thousands of people may be killed by landslides each year and property damage may be in the tens of billions of dollars, but the techniques for recognizing and coping with landslides are well developed. Landslides are generally more manageable and predictable than earthquakes, volcanic eruptions, and some storms, but only...
The West Antarctic rift system, a propagating rift "captured" by a mantle plume
John C. Behrendt, W.E. LeMasurier, Alan K. Cooper
1991, Conference Paper, Recent Progress in Antarctic Earth Science
The West Antarctic rift system, marked by a 3-5-kilometer high shoulder from northern Victoria Land to the Ellsworth Mountains, extends through the Ross Embayment and the Byrd Subglacial Basin. Geophysical data suggest that the ice covered area beneath the rift zone is underlain by Cenozoic volcanic rocks (flood basalts?), and...
