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...
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,...
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...
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...
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...
Franciscan Complex, Coast Range ophiolite and Great Valley sequence: Pacheco Pass to Del Puerto Canyon, California
Allan P. Bennison, M. Clark Blake Jr., B. F. Cox, William P. Elder, W. G. Ernst, Tekla Harms, T. H. Nilsen
1991, Book chapter, Geologic excursions in northern California: San Francisco to the Sierra Nevada
This field trip covers part of the Diablo Range and adjacent San Joaquin Valley of central California (Fig. 1 ). The core of the range is made up of rocks of the Franciscan Complex, flanked by Coast Range ophiolite (CRO) and Great Valley sequence (GVS). The Franciscan Complex in this...
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...
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...
Depositional patterns of the Mississippi Fan surface: Evidence from GLORIA II and high-resolution seismic profiles
David C. Twichell, Neil H. Kenyon, Lindsay M. Parson, Bonnie A. McGregor
1991, Book chapter
GLORIA long-range side-scan sonar imagery and 3.5-kHz seismic-reflection profiles depict a series of nine elongate deposits with generally high-backscatter surfaces covering most of the latest fanlobe sequence of the Mississippi Fan in the eastern Gulf of Mexico. The youngest deposit is a “slump” that covers a 250 by 100 km...
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 Marina District, San Francisco, California: Geology, history, and earthquake effects
Manuel G. Bonilla
1991, Bulletin of the Seismological Society of America (81) 1958-1979
A northwest-trending valley in the bedrock surface is buried by firm Pleistocene bay clay, a dense Pleistocene sand layer, soft Holocene bay sediments, loose to dense Holocene beach and dune sands, and artificial fill that have an aggregate maximum thickness of about 90 m (300 ft). Artificial filling of a...
Impact of exploratory wells, offshore Florida: A biological assessment
Phillip A. Dustan, Barbara H. Lidz, Eugene A. Shinn
1991, Bulletin of Marine Science (48) 94-124
Seven offshore exploratory oil well sites were examined in an effort to determine the ecological impact of exploratory drilling on the subtropical marine ecosystems of southern Florida, including seagrass beds and coral reefs. The time since drilling ranged from 2 to 29 years; water depths varied between 5 and 70...
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...
GAP Analysis Bulletin Number 1
Water Resources Division, U.S. Geological Survey
1991, GAP Bulletin 1
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...
Sounding the bottom of the world
T.A. Stern, Uri S. ten Brink
1991, New Scientist 41-43
No abstract available....
Dating methods applicable to the Quaternary
J.N. Rosholt, S.M. Colman, M. Stuiver, P.E. Damon, C. W. Naeser, N. D. Naeser, Barney J. Szabo, Daniel R Muhs, J. C. Liddicoat, S.L. Forman, M. N. Machette, K. L. Pierce
Roger B. Morrison, editor(s)
1991, Book chapter, Quaternary Nonglacial Geology: Conterminous U.S.
No abstract available....
