Prepared for Lower Colorado Region, U.S. Bureau of Reclamation, By the University of Arizona, University of California at Davis, and the University of Nevada, June 1978. / Water resources research projects in the Lower Colorado River Basin completed or in progress from mid -1976 through early 1978 are abstracted and compiled into this bibliography, with both university and agency oriented research included. Data were collected in large part by mailed questionnaire directed to all known researchers and agencies, plus direct contact where possible, with good response. The report includes abstracts, lists of publications resulting from these research efforts, funding levels where available and other pertinent data. It is indexed by keyword, principal investigator -project manager and by funding agency. These data were incorporated with similar earlier information in a computerized data file, from which selective retrievals can be made.

No description available.

Thesis (M.A. - History and Political Science)--University of Arizona. / Typewritten manuscript. Bibliography: leaves [203]-213.

Thesis (M.A. in Security Studies (Civil-Military Relations)--Naval Postgraduate School, Sept. 2004. / Thesis Advisor(s): Harold A. Trinkunas. Includes bibliographical references (p. 87-88). Also available online.

Thesis--Wisconsin. / Includes bibliographical references (leaves 182-184).

Abstract available in file 07summary.pdf / Thesis (PhD (Microbiology))--University of Pretoria, 2007. / Microbiology and Plant Pathology / unrestricted

No description available.

El objetivo de la presente Tesis doctoral consistió en la reconstrucción paleoclimática y paleoambiental del Pleistoceno tardío-Holoceno, a partir del análisis polínico de secuencias fósiles asociadas a tres sitios arqueológicos en la cuenca inferior de río Colorado. El área de estudio se ubica al sudoeste de la provincia de Buenos Aires (38° 54’ S / 63°24’O hasta 38° 54’ S / 62° 10’ O y 39° 55’S / 63° 24’ O hasta 39° 55’ S / 62° 06’ O) y comprende perfiles estratigráficos, sondeos y excavaciones de tres sitios arqueológicos ubicados en la cuenca inferior del río Colorado. El Perfil I corresponde al sitio arqueológico La Salada ubicado en el extremo sudoeste de la cuenca, el Perfil II asociado al sitio arqueológico El Tigre emplazado en el extremo sudeste de la cuenca y el Perfil III corresponde al sitio arqueológico Loma Ruiz ubicado hacia el noroeste de la cuenca. La primera parte de este trabajo consistió en evaluar la relación polen-vegetación y la segunda parte en el estudio polínico de las secuencias fósiles. Como metodología se implementó la interpretación de los análogos modernos y su comparación con los registros polínicos fósiles. Mediante técnicas convencionales se efectuó el relevamiento vegetal y el muestreo de superficie en parcelas seleccionadas, con el fin de caracterizar los “análogos modernos” para el área; y un muestreo palinológico de detalle en las secuencias fósiles de estudio. Se construyeron diagramas de frecuencia polínica y concentración polínica absoluta y se aplicaron técnicas de análisis estadístico. El estudio del sistema actual polen-vegetación abarcó la caracterización geomorfológica y el relevamiento y censo de la vegetación en locaciones próximas a los sitios arqueológicos. Se obtuvieron diez comunidades vegetales como análogos actuales para la transición Monte-Espinal. Las comunidades vegetales inferidas a partir de los tres registros polínicos fósiles, permitieron determinar quince zonas polínicas y cinco subzonas polínicas, de las cuales tres arrojaron concentraciones polínicas insuficientes para la determinación de las comunidades vegetales. El análisis conjunto de estas comunidades con evidencias sedimentológicas, geomorfológicas, arqueológicas, cronología (radiocarbónica y OCR) y análisis químicos de los perfiles permitió inferir los distintos paleoambientes desarrollados a lo largo de cada uno de ellos. Se efectuaron correlaciones basadas en las asociaciones polínicas registradas y en las dataciones OCR (Oxidizable Carbon Ratio) complementadas con fechados radiocarbónicos, y con perfiles polínicos estudiados al noreste y sudoeste de la provincia de Buenos Aires y el norte de Patagonia, por otros autores. Se realizaron comparaciones paleoambientales y paleoclimáticas entre los perfiles palinológicos estudiados en esta Tesis y otros registros ubicados al sur de Argentina y Chile. / The aim of this doctoral thesis was the paleoclimatic and paleoenvironmental reconstruction of the late Pleistocene-Holocene interval from pollen analysis of fossil sequences associated with three archaeological sites in the lower basin of the Colorado River. The study area is located southwest of Buenos Aires province (38° 54' S / 63° 24' W to 38° 54' S / 62° 10' W and 39° 55' S / 63° 24' W to 39° 55' S / 62° 06' W) and includes stratigraphic profiles, surveys and excavation of three archaeological sites located in the lower basin of the Colorado River. Profile I corresponds to the archaeological site of La Salada located in the southwestern corner of the basin, Profile II associated with the archaeological site called El Tigre in the extreme southeast of the basin and Profile III corresponds to the archaeological site Loma Ruiz located northwest of the basin. The first part of this work was to evaluate the pollen-vegetation relationship and the second part the study of fossil pollen sequences. The interpretation of modern analogues and their comparison with the fossil pollen records were implemented as a methodology. By conventional techniques vegetation survey and surface sampling was performed in selected plots in order to characterize the "modern analogs" of the area, and a detailed palynological sampling of fossil study sequences. Absolute pollen concentration and frequency pollen diagrams were constructed and statistical analysis techniques were applied. The study of the present pollen-vegetation system included a geomorphological characterization, survey and census of the vegetation in locations close to the archaeological sites. Ten plant communities as analogous to the actual transition Monte-Espinal were identified. The vegetation communities inferred from the three fossil pollen records allowed to determine fifteen zones and five sub zones, three of them showed insufficient pollen concentration to determinate vegetation communities. The combined analysis of these communities with sedimentological, geomorphological and archaeological evidence, chronology (radiocarbon and OCR) and chemical analysis of the profiles allowed to infer the different paleoenvironments developed at each locality. Correlations were made on the basis of registered pollen associations and OCR dating (Oxidizable Carbon Ratio) supplemented with radiocarbon dates. Besides, were compared with pollen profiles studied by other authors in the northeast and southwest of the province of Buenos Aires and northern Patagonia. Paleoenvironmental and paleoclimatic comparisons were made between palynological profiles studied in this thesis and other records located in southern Argentina and Chile.

Typescript (photocopy). / Digitized by Kansas State University Libraries

Plant macrofossils and pollen from six small basins in western Colorado are used to trace the history of vegetation and climate over the last 15,000 years. The late-glacial upper timberline was 2800 m, and sparse krummholz Picea grew up to 3200 m. Summer temperatures were 3° to 5°C cooler than today. The late Pleistocene climate was influenced by winter storms from the Pacific. Precipitation shifted to a summer-dominated pattern by at least 9000 yr B.P. with the development of the summer monsoon. Plant fossils from bogs and lakes located near modern ecotones track the elevations of the temperature-controlled upper timberline and the moisture-controlled lower forest through the Holocene. Between 9000 and 4000 yr B.P., the Picea engelmannii-Abies lasiocarpa forest covered a broader elevational range, with upper timberline 200-300 m higher than today. Mean annual temperatures were 1.8°C warmer, and mean summer temperatures were 2.1°C warmer, than today. Temperatures were still about 1°C warmer prior to 2000 yr B.P. The lower limits of the montane and subalpine forests were 100-200 m below their modern elevations from 9000-4000 yr B.P. Mean annual precipitation was 50-100 mm greater. By 2600 yr B.P. the modern lower forest borders were established. Modern pollen dispersal, transportation, and deposition was sampled in atmospheric collectors, moss polsters, and surface lake sediments. Annual accumulation rates range between 1000 and 5000 grains cm⁻²yr⁻¹. Modern influx (grains cm⁻²yr⁻¹)averages: 1100 in alpine tundra, 2700 in the subalpine forest, 3400 in the montane forest, and 200 in shrub steppe. Pollen spectra in atmospheric traps and moss polsters reflect local vegetation, and provide effective modern analogs for pollen accumulation in peat bogs. In forested environments 80-90% of the pollen deposition in small lakes (< 5 ha) with no inflowing streams comes from atmospheric input. Pollen spectra in open vegetation are distorted by pollen from other vegetation types. At least half of the pollen deposition in small alpine lakes comes from taxa growing up to 1500 m lower in elevation.