scholarly journals Vegetational History of Yellowstone Park as Determined by Pollen Analysis

1978 ◽  
Vol 2 ◽  
pp. 87-91
Author(s):  
George Frison ◽  
Jane Beiswenger
Keyword(s):  
Sediment Cores ◽  
Lake Basin ◽  
Large Lake ◽  
Yellowstone Lake ◽  
North Central ◽  
University Of Utah ◽  
The North ◽  
History Of ◽  
Park Area ◽  
The University

The purpose of this project was to interpret the vegetational history of the Yellowstone Park area by the analysis of pollen contained in sediment cores from four locations in Yellowstone Lake. The cores, collected by Dr. Robert Smith of the University of Utah, were from the north central portion, the west thumb area, the south arm and the southeast arm of the lake. The cores were to be compared to determine pollen variations within the lake. Differences between a small pond and a large lake basin in reflecting climatic change were to be studied by comparing the results with pollen counts from Fifteen Foot Lagoon (Baker, 1976).

scholarly journals Holocene polynya dynamics and their interaction with oceanic heat transport in northernmost Baffin Bay

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rebecca Jackson ◽  
Anna Bang Kvorning ◽  
Audrey Limoges ◽  
Eleanor Georgiadis ◽  
Steffen M. Olsen ◽  
...  
Keyword(s):  
Sediment Cores ◽  
Active Role ◽  
Atlantic Water ◽  
The Arctic ◽  
Negative Consequences ◽  
Baffin Bay ◽  
The North ◽  
North Water ◽  
History Of ◽  
Ocean Conditions

AbstractBaffin Bay hosts the largest and most productive of the Arctic polynyas: the North Water (NOW). Despite its significance and active role in water mass formation, the history of the NOW beyond the observational era remains poorly known. We reconcile the previously unassessed relationship between long-term NOW dynamics and ocean conditions by applying a multiproxy approach to two marine sediment cores from the region that, together, span the Holocene. Declining influence of Atlantic Water in the NOW is coeval with regional records that indicate the inception of a strong and recurrent polynya from ~ 4400 yrs BP, in line with Neoglacial cooling. During warmer Holocene intervals such as the Roman Warm Period, a weaker NOW is evident, and its reduced capacity to influence bottom ocean conditions facilitated northward penetration of Atlantic Water. Future warming in the Arctic may have negative consequences for this vital biological oasis, with the potential knock-on effect of warm water penetration further north and intensified melt of the marine-terminating glaciers that flank the coast of northwest Greenland.

Within-field Pathogenic Diversity of Phytophthora sojae in Commercial Soybean Fields in Iowa

2009 ◽  
Vol 10 (1) ◽  
pp. 8 ◽  
Author(s):  
Alison E. Robertson ◽  
Silvia R. Cianzio ◽  
Sarah M. Cerra ◽  
Richard O. Pope
Keyword(s):  
The United States ◽  
Phytophthora Sojae ◽  
Soil Samples ◽  
Soybean Plant ◽  
North Central Region ◽  
North Central ◽  
The North ◽  
History Of ◽  
The Many ◽  
Pathogenic Diversity

Phytophthora root and stem rot (PRR), caused by the oomycete Phytophthora sojae, is an economically important soybean disease in the north central region of the United States, including Iowa. Previous surveys of the pathogenic diversity of P. sojae in Iowa did not investigate whether multiple pathotypes of the pathogen existed in individual fields. Considering the many pathotypes of P. sojae that have been reported in Iowa, we hypothesized multiple pathotypes could exist within single fields. In the research reported herein, several soil samples were collected systematically from each of two commercial fields with a history of PRR in Iowa, and each soil sample was baited separately for isolates of P. sojae. Numerous pathotypes of P. sojae were detected from both fields. As many as four pathotypes were detected in some soil samples (each consisting of six to eight soil cores), which suggests that a single soybean plant could be subjected to infection by more than one pathotype. This possibility presents important implications in breeding resistant cultivars and in the management of PRR. Accepted for publication 14 July 2009. Published 8 September 2009.

Exhumational history of the north central Pamir

Tectonics ◽  
2010 ◽  
Vol 29 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
William H. Amidon ◽  
Scott A. Hynek
Keyword(s):  
North Central ◽  
The North ◽  
History Of

A palynological study of postglacial vegetation changes in the University Research Forest, southwestern British Columbia

1973 ◽  
Vol 51 (11) ◽  
pp. 2085-2103 ◽  
Author(s):  
Rolf W. Mathewes
Keyword(s):  
British Columbia ◽  
Pinus Contorta ◽  
Vegetation Change ◽  
Vegetation History ◽  
Sediment Cores ◽  
Silty Clay ◽  
Pollen Diagram ◽  
History Of ◽  
Palynological Study ◽  
The University

The postglacial vegetation history of the University of British Columbia Research Forest was investigated using percentage and absolute pollen analysis, macrofossil analysis, and radiocarbon dating. A marine silty clay deposit records the oldest (12 690 ± 190 years before present (B.P.)) assemblage of terrestrial plant remains so far recovered from the postglacial of south-coastal British Columbia. Lodge-pole pine (Pinus contorta) dominated this early vegetation, although some Abies, Picea, Alnus, and herbs were also present. Sediment cores from two lakes were also studied. The older is Marion Lake, where five pollen assemblage zones are recognized, beginning with a previously undescribed assemblage of Pinus contorta, Salix, and Shepherdia in clay older than 12 350 ± 190 B.P. The pollen diagram from Surprise Lake (11 230 ± 230 B.P.) is divided into three pollen zones which show the same major trends of vegetation change as the Marion Lake diagram.The first report of the postglacial vegetation history of cedar (Thuja and perhaps Chamaecyparis) in southwestern British Columbia is presented from pollen and macrofossil analyses.At about 10 500 B.P. in both lakes, pollen of Douglas fir (Pseudotsuga menziesii) began a rapid increase, probably in response to climatic amelioration. The palynological evidence, supported by well-preserved bryophyte subfossils, suggests that humid coastal conditions have prevailed in the study area since about 10 500 B.P., with virtually no evidence for a classical Hypsithermal interval between 8500 B.P. and 3000 B.P.

scholarly journals "Insufferably Stupid or Miserably Out of Place": F. A. P. Barnard and His Scientific Instrument Collection in the Antebellum South

2009 ◽  
Vol 39 (4) ◽  
pp. 418-443 ◽  
Author(s):  
Stephen Case
Keyword(s):  
Civil War ◽  
The United States ◽  
Scientific Instrument ◽  
Antebellum South ◽  
University Of Mississippi ◽  
The South ◽  
The North ◽  
History Of ◽  
The University ◽  
Practice Of Science

In the 1850s, the American scientist and educator Frederick A. P. Barnard created a collection of scientific apparatus at the University of Mississippi in Oxford, Mississippi, of a size and expense that surpassed any collection in the United States at that time. The collection, which would come to include over three hundred instruments of both American and European manufacture, was the attempt by Barnard, born and educated in the North, to bring Big Science to the South and challenge the dominance of Northern schools in science education. In this respect it failed, and the collection became a forgotten footnote in the history of Southern science. This article examines the importance of the collection in understanding science at U.S. universities before the Civil War and what Barnard referred to as the "scientific atmosphere" of the South. The first section compares the collection to others of the period, highlighting its historical uniqueness and significance. The second section uses Barnard's correspondence to construct a narrative of the collection's assembly, providing insight into the international scientific instrument market of the period as well as the difficulties he faced working in the antebellum South. Finally, an examination of Barnard's perceptions regarding intellectual isolation and the failure of his endeavor highlights differences perceived by scientists of the day concerning the practice of science in the North versus in the South prior to the Civil War.

scholarly journals The University of South Alabama Mesonet and Coastal Observing System: A Technical and Statistical Overview

2010 ◽  
Vol 27 (9) ◽  
pp. 1417-1439 ◽  
Author(s):  
Sytske K. Kimball ◽  
Madhuri S. Mulekar ◽  
Shailer Cummings ◽  
Jack Stamates
Keyword(s):  
Weather Forecasting ◽  
Meteorological Data ◽  
Future Research ◽  
Sensor Failure ◽  
North Central ◽  
The North ◽  
System A ◽  
The University ◽  
Mexico Coast ◽  
Good Agreement

Abstract The University of South Alabama Mesonet consists of 26 sites across the north-central Gulf of Mexico coast. Although the original purpose of the mesonet was monitoring landfalling tropical systems, meteorological data are collected and disseminated every 5 min year-round to serve a multitude of purposes, including weather forecasting, education, and research. In this paper a statistical analysis and like-sensor comparison demonstrates that variables, measured by different sensor types or by sensors at different heights, correlate well. The benefits of sensor redundancy are twofold, offering 1) backup sensors in the case of sensor failure during severe weather and 2) the ability to perform a large number of internal consistency checks for quality control purposes. An oceanographic compliment to the University of South Alabama Mesonet system, which was deployed by NOAA’s Atlantic Oceanographic and Meteorological Laboratory (AOML) to measure surface waves and ocean currents in an area south of Mobile, Alabama, is described. A preliminary comparison of mesonet wind data and ocean wave data show good agreement, offering promising opportunities for future research.

Sedimentology and stratigraphy of the Cretaceous Virginian Ridge Formation, Methow Basin, Washington

1985 ◽  
Vol 22 (9) ◽  
pp. 1274-1285 ◽  
Author(s):  
James H. Trexler Jr.
Keyword(s):  
Upper Cretaceous ◽  
Western North America ◽  
The West ◽  
Detailed Model ◽  
North Central ◽  
North American Cordillera ◽  
The North ◽  
History Of ◽  
Tectonic Settings ◽  
Overlying Strata

The Cretaceous Methow Basin of north-central Washington is the southernmost of a series of Mesozoic successor basins in the Cordillera of western North America. The Albian–Campanian(?) Virginian Ridge Formation comprises three members, newly defined here, that gradationally interfinger with each other and grade laterally and upward into overlying strata. Detailed stratigraphic analysts of the Virginian Ridge Formation and of the intimately related parts of the Winthrop and Midnight Peak formations indicates that these units represent complexly interfingering facies derived from a variety of sources, both to the west and to the east of the basin and locally within the system. This study suggests a detailed model for the history of the Upper Cretaceous Methow Basin: generation of a restricted basin with a stable, roughly north–south-trending axis, filled by a stable, east-derived fluvial and deltaic system (Winthrop Formation) interfingering with a laterally amalgamated, west-derived northward and eastward transgressive fan-delta system (Virginian Ridge Formation). The sequence grades upward into, and finally is overwhelmed by, locally derived volcanics of the Midnight Peak Formation. Similar, and in part coeval, successor basin sequences throughout the North American Cordillera may have been generated in response to similar tectonic settings.

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