Bird communities of natural and modified habitats in Panama
L. J. Petit, D. R. Petit, D. G. Christian, Hugo D. W. Powell
1999, Ecography (22) 292-304
Only a small proportion of land can realistically be protected as nature reserves and thus conservation efforts also must focus on the ecological value of agroecosystems and developed areas surrounding nature reserves. In this study, avian communities were surveyed in 11 habitat types in central Panama, across a gradient from...
Habitat associations of migrating and overwintering grassland birds in southern Texas
L.D. Igl, B.M. Ballard
1999, Condor (101) 771-782
We report on the habitat associations of 21 species of grassland birds overwintering in or migrating through southern Texas, during 1991-1992 and 1992-1993. Ninety percent of our grassland bird observations were made during winter and spring, and only 10% occurred during fall. Grassland species made up a high proportion of...
Robowell: An automated process for monitoring ground water quality using established sampling protocols
G.E. Granato, K.P. Smith
1999, Ground Water Monitoring and Remediation (19) 81-89
Robowell is an automated process for monitoring selected ground water quality properties and constituents by pumping a well or multilevel sampler. Robowell was developed and tested to provide a cost-effective monitoring system that meets protocols expected for manual sampling. The process uses commercially available electronics, instrumentation, and hardware, so it...
Sequential filling of a late paleozoic foreland basin
J. C. Mars’, W.A. Thomas
1999, Journal of Sedimentary Research (69) 1191-1208
Through the use of an extensive data base of geophysical well logs, parasequence-scale subdivisions within a late Paleozoic synorogenic clastic wedge resolve cycles of sequential subsidence of a foreland basin, sediment progradation, subsidence of a carbonate shelf edge, diachronously subsiding discrete depositional centers,...
An example of neotectonism in a continental interior - Thebes Gap, Midcontinent, United States
R.W. Harrison, D. Hoffman, J.D. Vaughn, J. R. Palmer, C.L. Wiscombe, J. P. McGeehin, W. J. Stephenson, J. K. Odum, R. A. Williams, S.L. Forman
1999, Tectonophysics (305) 399-417
Some of the most intense neotectonic activity known in the continental interior of North America has been recently discovered on a fault zone in the Thebes Gap area, Missouri and Illinois. This faulting almost assuredly was accompanied by large earthquakes. The zone is located approximately 30 km north of the...
Diversifying natural resources value measurements: The Trinity River study
J. G. Taylor, A. J. Douglas
1999, Society and Natural Resources (12) 315-336
An interdisciplinary team set out to establish the economic and social values of the Trinity River in northern California . This information was intended to support the Secretary of the Interior's decision on allocation of Trinity River flows . This team set out to measure the values of Trinity River...
Estimating lake-atmosphere CO2 exchange
D.E. Anderson, Robert G. Striegl, D.I. Stannard, C.M. Michmerhuizen, T.A. McConnaughey, J. W. LaBaugh
1999, Limnology and Oceanography (44) 988-1001
Lake‐atmosphere CO2 flux was directly measured above a small, woodland lake using the eddy covariance technique and compared with fluxes deduced from changes in measured lake‐water CO2 storage and with flux predictions from boundary‐layer and surface‐renewal models. Over a 3‐yr period, lake‐atmosphere exchanges of CO2 were measured over 5 weeks...
No spreading across the southern Juan de Fuca ridge axial cleft during 1994-1996
C.D. Chadwell, J. A. Hildebrand, Fred N. Spiess, J. L. Morton, W. R. Normark, C.A. Reiss
1999, Geophysical Research Letters (26) 2525-2528
Direct-path acoustic measurements between seafloor transponders observed no significant extension (−10±14 mm/yr) from August 1994 to September 1996 at the southern Juan de Fuca Ridge (44°40′ N and 130°20′ W). The acoustic path for the measurement is a 691-m baseline straddling the axial cleft, which bounds...
Subdivision of Holocene Baltic sea sediments by their physical properties [Gliederung holozaner ostseesedimente nach physikalischen Eigenschaften]
Jan Harff, Geoffrey C. Bohling, R. Endler, J.C. Davis, Ricardo A. Olea
1999, Petermanns Geographische Mitteilungen (143) 50-55
The Holocene sediment sequence of a core taken within the centre of the Eastern Gotland Basin was subdivided into 12 lithostratigraphic units based on MSCL-data (sound velocity, wet bulk density, magnetic susceptibility) using a multivariate classification method. The lower 6 units embrace the sediments until the Litorina transgression, and the...
Interactive effects of nutrient additions and predation on infaunal communities
M.H. Posey, T.D. Alphin, L. Cahoon, D. Lindquist, M.E. Becker
1999, Estuaries (22) 785-792
Nutrient additions represent an important anthropogenic stress on coastal ecosystems. At moderate levels, increased nutrients may lead to increased primary production and, possibly, to increased biomass of consumers although complex trophic interactions may modify or mask these effects. We examined the influence of nutrient additions and interactive effects of trophic...
Neogene basins of the northern Rio Grande rift: Partitioning and asymmetry inherited from Laramide and older uplifts
K.S. Kellogg
1999, Tectonophysics (305) 141-152
Three asymmetric Neogene basins in the northern Rio Grande rift of New Mexico and Colorado - the San Luis basin, the upper Arkansas River graben, and the Blue River graben - are tilted toward large flanking normal faults and lie astride the similarly asymmetric Late Cretaceous-early Tertiary (Laramide) San Juan-San...
Benthic marine debris, with an emphasis on fishery-related items, surrounding Kodiak Island, Alaska, 1994-1996
N.A. Hess, C. A. Ribic, I. Vining
1999, Marine Pollution Bulletin (38) 885-890
Composition and abundance of benthic marine debris were investigated during three bottom trawl surveys in inlet and offshore locations surrounding Kodiak Island, Alaska, 1994-1996. Debris items were primarily plastic and metal regardless of trawl location. Plastic bait jars, fishing line, and crab pots were the most common fishery-related debris items...
CFIRP: What we learned in the first ten years
C. L. Chambers, W.C. McComb, J. C. Tappeiner II, L.D. Kellogg, R.L. Johnson, G. Spycher
1999, Conference Paper, Forestry Chronicle
In response to public dissatisfaction with forest management methods, we initiated the College of Forestry Integrated Research Project (CFIRP) to test alternative silvicultural systems in Douglas-fir (Pseudotsuga menziesii stands in western Oregon. We compared costs and biological and human responses among a control and three replicated silvicultural alternatives to clearcutting...
Structural styles of Paleozoic intracratonic fault reactivation: A case study of the Grays Point fault zone in southeastern Missouri, USA
C.W. Clendenin, S. F. Diehl
1999, Tectonophysics (305) 235-248
A pronounced, subparallel set of northeast-striking faults occurs in southeastern Missouri, but little is known about these faults because of poor exposure. The Commerce fault system is the southernmost exposed fault system in this set and has an ancestry related to Reelfoot rift extension. Recent published work indicates that this...
Reactive solute transport in streams: A surface complexation approach for trace metal sorption
Robert L. Runkel, Briant A. Kimball, Diane M. McKnight, Kenneth E. Bencala
1999, Water Resources Research (35) 3829-3840
A model for trace metals that considers in-stream transport, metal oxide precipitation-dissolution, and pH-dependent sorption is presented. Linkage between a surface complexation submodel and the stream transport equations provides a framework for modeling sorption onto static and/or dynamic surfaces. A static surface (e.g., an iron- oxide-coated streambed) is defined as...
Targeted stock identification using multilocus genotype 'familyprinting'
B. H. Letcher, T.L. King
1999, Conference Paper, Fisheries Research
We present an approach to stock identification of small, targeted populations that uses multilocus microsatellite genotypes of individual mating adults to uniquely identify first- and second-generation offspring in a mixture. We call the approach 'familyprinting'; unlike DNA fingerprinting where tissue samples of individuals are matched, offspring from various families are...
Effectiveness of an existing estuarine no-take fish sanctuary within the Kennedy Space Center, Florida
D.R. Johnson, N.A. Funicelli, James A. Bohnsack
1999, North American Journal of Fisheries Management (19) 436-453
Approximately 22% of the waters of the Merritt Island National Wildlife Refuge, which encompasses the Kennedy Space Center, Florida, have been closed to public access and fishing since 1962. These closed areas offer an opportunity to test the effectiveness of “no-take” sanctuaries by analyzing two replicated estuarine areas. Areas open...
Seasonal variability in hydrologic-system response to intense rain events, Matanuska Glacier, Alaska, U.S.A.
J.C. Denner, D. E. Lawson, G.J. Larson, E.B. Evenson, R. B. Alley, J.C. Strasser, S. Kopczynski
1999, Annals of Glaciology (28) 267-271
Two rain events at Matanuska Glacier illustrate how subglacial drainage system development and snowpack conditions affect hydrologic response at the terminus. On 21 and 22 September 1995, over 56 mm of rain fell in the basin during a period usually characterized by much drier conditions. This event caused an 8-fold...
Coupling groundwater and riparian vegetation models to assess effects of reservoir releases
Abraham E. Springer, Julie M. Wright, Patrick B. Shafroth, Juliet C. Stromberg, Duncan T. Patten
1999, Water Resources Research (35) 3621-3630
Although riparian areas in the arid southwestern United States are critical for maintaining species diversity, their extent and health have been declining since Euro‐American settlement. The purpose of this study was to develop a methodology to evaluate the potential for riparian vegetation restoration and groundwater recharge. A numerical groundwater flow...
Integrated foraminiferal biostratigraphy and chemostratigraphy of the querecual formation (Cretaceous), Eastern Venezuela
S. Crespo De Cabrera, W.V. Sliter, I. Jarvis
1999, Journal of Foraminiferal Research (29) 487-499
An integrated foraminiferal biostratigraphy and chemostratigraphy is presented for the Lower to Upper Cretaceous Querecual Formation exposed on Chimana Grande Island, Eastern Venezuela. The formation consists of >450 m alternating foraminiferal and organic-rich carbonates and laminated mudrocks, and is considered the main hydrocarbon source rock for the eastern Venezuela Basin....
Utility of EXAFS in characterization and speciation of mercury-bearing mine wastes
C.S. Kim, J. J. Rytuba, Gordon E. Brown Jr.
1999, Journal of Synchrotron Radiation (6) 648-650
Extensive mining of large mercury deposits located in the California Coast Range has resulted in mercury contamination of both the local environment and water supplies. The solubility, dispersal, and ultimate fate of mercury are all affected by its chemical speciation, which can be most readily determined in a direct fashion...
Bacterial respiration of arsenic and selenium
J.F. Stolz, R.S. Oremland
1999, FEMS Microbiology Reviews (23) 615-627
Oxyanions of arsenic and selenium can be used in microbial anaerobic respiration as terminal electron acceptors. The detection of arsenate and selenate respiring bacteria in numerous pristine and contaminated environments and their rapid appearance in enrichment culture suggest that they are widespread and metabolically active in nature. Although the bacterial...
The chemistry, mineralogy, and petrology of the George Ashley Block pegmatite body
W.D. Kleck, E.E. Foord
1999, American Mineralogist (84) 695-707
The George Ashley Block (GAB) is a rockslide block located in the Pala pegmatite district of Southern California. It is layered, asymmetric, pocket containing, and peraluminous. The GAB consists of quartz (42 vol%), Na-rich plagioclase (27%), potassium feldspar (24%), muscovite (7%), Mn-rich garnet (2%), biotite (1%), and a trace of...
Structural and petrologic evolution of the Lihue basin and eastern Kauai, Hawaii
P.W. Reiners, B.K. Nelson, S. K. Izuka
1999, Geological Society of America Bulletin (111) 674-685
The topography of the eastern part of the Hawaiian island of Kauai is dominated by the Lihue basin, a large (∼110 km2) semicircular depression bounded by steep cliffs and partly filled by late rejuvenated-stage (or posterosional stage) volcanic material. As with other large,...
Digital mapping of the Mars Pathfinder landing site: Design, acquisition, and derivation of cartographic products for science applications
Lisa R. Gaddis, Randolph L. Kirk, J. R. Johnson, Laurence A. Soderblom, A. W. Ward, J. Barrett, Kris J. Becker, Tammy L. Becker, J. Blue, D. Cook, E. Eliason, Trent M. Hare, Elpitha Howington-Kraus, C. Isbell, E.M. Lee, Bonnie L. Redding, Robert M. Sucharski, Tracie L. Sucharski, P. H. Smith, D.T. Britt
1999, Journal of Geophysical Research E: Planets (104) 8853-8868
The Imager for Mars Pathfinder (IMP) acquired more than 16,000 images and provided panoramic views of the surface of Mars at the Mars Pathfinder landing site in Ares Vallis. This paper describes the stereoscopic, multispectral IMP imaging sequences and focuses on their use for digital mapping of the landing site...
