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Showing 1 to 20 of 173 for “"Appalachians"”.
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Erosional history of the New River, southern Appalachians, Virginia
Much of the bedrock surface of the Southern Appalachian Valley and Ridge Province is covered by a veneer of surficial deposits classified as alluvium, colluvium, and residuum. In this investigation the surficial geology of a 60-km<sup>2</sup> area of the New River drainage system was mapped at a …
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Factors Influencing Predation on Ruffed Grouse in the Appalachians
Predation accounts for the majority of ruffed grouse mortality beyond the brooding period throughout grouse range. Most studies of ruffed grouse ecology have taken place in the central portion of the species range including the Great Lakes states and southern Canada where aspen (Populus …
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Seasonal activity patterns of bats in the Central Appalachians
… bat species are affected in the central Appalachians. Wind energy is one of the most rapidly-growing energy sources in eastern United States, and bats are often killed when they fly near wind turbines. Fatality rates at wind turbines is highest in bat species that migrate instead of …
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Regional dolomitization of Early Ordovician, Upper Knox Group, Appalachians
The Early Ordovician, Upper Knox Group consists of meter-scale shallowing-upward cycles that were deposited on a low-sloping ramp. Cycles formed in response to short term (<100 k.y.) eustatic sea-level fluctuations and typically have well developed tidal flat caps. Cycles are bundled into five …
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Impacts of Fire on Bats in the Central Appalachians
Fire occurrence was widespread in the central Appalachians pre-European settlement due to Native American ignition and occasional lightning strikes, and continued through European settlement. During this time, low to mixed severity burns supported a suite of ecological communities that were fire …
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Ruffed grouse nutrition and foraging in the southern Appalachians
Feeding trials.showed that ruffed grouse (Bonasa umbellus) performed well on diets containing 20% Christmas hollyfem (Polystichum acrostichoides) or mountain laurel (Kalmia latifolia), but diets containing 40% of these forages resulted in lower protein and energy intake and the Christmas hollyfem …
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Stratigraphic Architecture and Paleogeography of the Juniata Formation, Central Appalachians
… Ordovician (Cincinnatian) strata of the central Appalachians provide an opportunity to study the effects of both tectonics and eustasy within a foreland-basin setting. The Juniata Formation consists of red sandstones, siltstones, and shales that were deposited as part of an extensive …
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Reclamation of surface-mined forest land in the southern Appalachians
… volume in a siltstone spoil. In the southern Appalachians, oxidized (brown) sandstone is a good overburden to use as a topsoil substitute for forest land reclamation. A second experiment was conducted to evaluate the effect of surface grading practices on erosion, herbaceous ground cover, and …
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Geochemistry and petrogenesis of the Catoctin Volcanic Province, central Appalachians
… rift related magmas in the southern and central Appalachians, the 570 Ma age suggests a two stage rift event, the first one failed while the second succeeded at opening the Atlantic ocean basin.
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Conservation and management of the Allegheny woodrat in the central Appalachians
The Allegheny woodrat occurs throughout the Appalachian Mountains, where it forms isolated colonies in rock outcrops, cliffs, and caves. Populations along the northern and western peripheries of the range have experienced drastic declines in the past 20--30 years. A paucity of ecological …
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Effects of Alternative Silvicultural Treatments on Regeneration in the Southern Appalachians
Harvesting practices in the southern Appalachians have moved away from clearcutting in favor of variable retention harvesting systems. A study was initiated in 1995-8 to investigate the effects of retaining varying numbers of residual trees on regeneration in seven silvicultural treatments. A …
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Effects of alternative silvicultural practices on oak regeneration in the southern Appalachians
The regeneration in oak-dominated stands following five silvicultural treatments was examined on four sites in the mountains of Virginia and West Virginia. Treatments included: silvicultural clearcut, leave-tree, commercial clearcut, shelterwood, and group selection. The effects of harvesting were …
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The Bays formation (Middle Ordovician) and related rocks of the southern Appalachians
The Bays Formation is of late Middle Ordovician (upper Wilderness) age and ls a predominantly clastic formation that crops out in 16 belts in the southeastern side of the Appalachian Valley from near Roanoke, Virginia, to northwestern Georgia. The various lithotopes in the Bays include …
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Ruffed grouse (Bonasa umbellus) habitat ecology in the central and southern Appalachians
Ruffed grouse populations are low in Appalachian forests, possibly because low habitat quality negatively affects survival, condition, and reproduction. Through the Appalachian Cooperative Grouse Research Project (ACGRP) researchers tracked >1500 radioed grouse at 10 study sites (1996__2002). To …
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Distribution and population genetics of Northern saw-whet owls in the Southern Appalachians
… dynamics of A. acadicus in the Southern Appalachians to determine a subspecies was present. Samples from Pennsylvania, New York, Tennessee and North Carolina were obtained; cytochrome b and NADH dehydrogenase subunit 2 were sequenced and analyzed using AMOVAs and network analyses. The …
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Community ecology of aquatic insects in forested headwater streams in the southern Appalachians
… in headwater streams in the southern Appalachians. Distance decay in taxonomic and functional similarity was used to determine the scales at which taxonomic turnover occurred within functional niches. Trait-neutral models of community composition were used as null models to assess …
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Carbon cycle changes during the end-Marjuman (Cambrian) extinction in the Southern Appalachians
… within the Nolichucky Formation of the Southern Appalachians making it an excellent candidate for the study of the precise relationship between the extinction and changes in the carbon cycle. This investigation confirms the onset of the SPICE occurs at the extinction boundary however no negative …
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The Middle Ordovician Knox unconformity, Virginia Appalachians: transition from passive to convergent margin
The Knox unconformity in the central and southern Appalachians is developed on Lower to early Middle Ordovician Knox/Beekmantown carbonates. The unconformity marks the transition from Cambro-Ordovician shelf carbonate deposition on a passive margin to carbonate and clastic deposition in a foreland …
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U-Pb dating of granites from the Charlotte belt of the southern Appalachians
… plutons in the Charlotte belt of the southern Appalachians have provided evidence of Cambro-Ordovician and Siluro-Devonian magmatic activity. Several U-Pb zircon ages of Cambro-Ordovician plutons predate their Rb-Sr whole rock ages by as much as 60 m.y., suggesting a post emplacement …
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Stratigraphy, sedimentology, and diagenetic history of the Siluro- Devonian Helderberg Group, central Appalachians
… Devonian Helderberg Group, Central Appalachians, is a sequence of mixed siliciclastic-carbonate sediments that was deposited during relative tectonic quiescence on a ramp that built out from low-relief tectonic highlands bordering the eastern side of the Appalachian Basin. Three …
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