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Showing 1 to 20 of 38 for “"Postglacial"”.
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The postglacial sedimentology of Devils Lake, North Dakota
<p> The present sedimentary environment of Devils Lake, a Closed brackish lake in northeastern North Dakota, was investigated, and changes in the Holocene lacustrine environment are interpreted. Sediment samples from Main Bay of Devils Lake were analyzed for their physical, chemical and mineral …
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Modelling Palaeohydrological Controls in Postglacial Mountain Drainage Basins
Quaternary glacial processes were a driving factor in the formation of the landscape of the Canadian Rocky Mountains. Modelling of basin scale hydrology in glaciated mountain regions, including the associated morphology and sedimentology, has not previously been undertaken. The present study …
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Postglacial ostracod distribution and paleoecology, Devils Lake basin, northeastern North Dakota
<p>Sediment cores were taken from Main Bay and Creel Bay of Devils Lake (in 1975 and 1976) and East Devils Lake (in 1978), within the Devils Lake basin, and from Red Willow Lake (in 1979), a control lake outside of the Devils Lake basin, northeastern North Dakota. The cores were sampled, for the …
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Postglacial Sandy Hill: A Regional Manifestation of the Gulf of Maine Archaic Tradition
Over twenty years of archaeological excavations at Sandy Hill, in Mashantucket, CT, have provided an incredibly rich assemblage of artifacts. Yet some of the most basic questions about Sandy Hill's Early Archaic inhabitants remain unanswered. This thesis will synthesize the results of major …
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Mating Habits, Dispersal and Postglacial Range Expansion of Nigronia Serricornis (Say) (Megaloptera: Corydalidae)
It was hypothesized that fragmentation and isolation-by-distance would be evident in the genetic population structure, due to poor dispersal ability. Using sequence data from a 630-base fragment of cytochrome oxidase I (COI), nested clade phylogeographical analysis (NCPA) was performed to determine …
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Constraining tectonic and climatic controls on glacial/postglacial landscape evolution using numerical modeling
… further influenced the pace and style of postglacial fluvial and hillslope processes. How do tectonic and climatic conditions impact the rates and spatial patterns of glacial erosion? How do the inherited glacial landforms influence the development of postglacial landscapes? To answer …
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Postglacial Fire, Vegetation, and Environmental Change in the Sinlahekin Wildlife Area, Okanogan County, Washington (USA)
… and pollen analysis were used to reconstruct the postglacial environmental history of the site. Results show that fire maintained a constant presence on the landscape and has been closely linked to fuel availability, until Euro American settlement (ca. AD 1850). In general, fire activity was …
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Postglacial Reconstruction of Fire History from a Small Lake in Southwest Yukon using Sedimentary Charcoal and Pollen
Previous research suggests climate warming during the current century is likely to lead to an increase in the frequency and severity of wildfire. Recent wildfire seasons in northern Canada generally support these studies, with some of the worst fire seasons on record occurring during the past few …
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Postglacial paleoecology and effects of European settlement on the environment of Lake Hunger and Lake Lisgar, Southwestern Ontario /
… since European settlement I to determine the postglacial chemical history of Lake Hunger, and to determine the vegetational history of the Lake Hunger area from postglacial time to the present. The minus 80 mesh fraction of 108 soil samples and 18 stream sediment samples collected in the …
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Palynology of late-glacial and postglacial sediments in Georgian Bay, Ontario, Canada, as related to the Great Lakes history /
… of pollen and spores, and (3) the late- and postglacial history of vegetational and climatic changes in the Georgicin Bay region. Modem pollen and spore assemblages in Georgian Bay do reflect the surrovinding vegetation when preservation and pollen production by the different species are …
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Phylogeographic and morphometric studies on the Eurasian pygmy shrew Sorex minutus: insights into its evolutionary history and postglacial colonisation in Europe
Here, I investigate the phylogeography and morphology of the Eurasian pygmy shrew Sorex minutus, searching for significantly differentiated lineages, colonisation routes and demographic parameters that would explain the effects of the Quaternary glaciations on the current distribution of the …
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Late quaternary valley fill sediments in the River Tyne valley: Understanding late Devensian deglaciation and early postglacial response in northern England
This thesis reconstructs part of the deglacial and early post-glacial history of the River Tyne Valley, Northumberland. Data has been gathered through description and interpretation of sedimentary sequences and stratigraphies from quarry and cut-bank exposure, the development of a geochronology was …
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Late Devensian and early Flandrian vegetational history and deglacial chronology of Western Argyll
… Cowal Peninsula during the Lateglacial and early-postglacial periods, and to reconcile the varied reconstructions of Loch Lomond Readvance glaciers, proposed on geomorphic data, in the light of the palynological evidence. Two Lateglacial biostratigraphies were examined by relative and pollen …
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Effects of Glaciation on Volcanism in Iceland
… proportions of the subglacial, finiglacial and postglacial eruptions) and the observational data suggests that the melt ascent velocity during the last deglaciation beneath Iceland is of the order of $\sim$100~$\text{m/year}$. The effects of glacial loading during the last glacial period on …
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Aspects of the Flandrian vegetational history of south-west Scotland, with special reference to possible Mesolithic impact
… level of charcoal prior to a rise in the early postglacial (Fl I) at both Loch Doon and Loch Dee may prove to be of regional significance. The strongest evidence for local Mesolithic disturbance came from Loch Dee. The results from the small-basin sites were contrasted with those previously …
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Species response to shifting and variable climates
… the spatial patterns of glacial persistence and postglacial colonization of an alder (Alnus) species complex (n = 3 taxa) from this vast region. Using high-throughput DNA sequencing, hindcast Species Distribution Modeling, and a reassessment of pollen records, I found evidence that Alnus expanded …
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Glacial geology of western Sheridan County, North Dakota
… has been minimized by the lack of effective postglacial weathering.</p>
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Genomics of Climatic Adaptation in Populus Trichocarapa
… and recent bottlenecks associated with postglacial recolonization. These findings provide new insights into the genomic architecture underlying climatic adaptation and how selection drives adaptive evolution of tree species.
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