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McManamay, Ryan - - 2012
In Apr. 2010 white suckers (Catostomus commersoni) were observed spawning in the small tributary to a constructed stormwater pond on the Virginia Polytechnic Institute and State University campus. The tributary is the only direct input to the pond and provides perennial flow. We documented spawning activity, habitat characteristics, habitat use, ...
Cove, Michael - - 2012
The mesopredator release hypothesis (MRH) has been suggested as a reason why many mammalian generalist mesopredators flourish and become abundant. However, the MRH has only been examined in a limited number of field studies. Some studies have argued that coyotes (Canis latrans) act as top predators in fragmented forest systems ...
Hanberry, Brice - - 2012
Fine scale spatial mapping of historical tree records over large extents is important for determining historical species distributions. We compared performance of two ensemble methods based on classification trees, random forests, and boosted classification, for mapping continuous historical distributions of tree species. We used a combination of soil and terrain ...
Redmond, Miranda - - 2012
This study documents 25 y of change in the abundance of Quercus rubra (northern red oak) and Quercus alba (white oak), in a previous chestnut (Castanea castanea)oak forest in the Southern Appalachians of the eastern U.S.A. Spatially explicit data from 1983-1984 and 2007-2008 of individually mapped trees on two plots ...
Chun, Young - - 2012
We investigated the changes in stand structure, species composition, and soil characteristics of jack pine (Pinus banksiana Lamb.) disjunct stands on the southern shore of Lake Michigan in North America. Our NMS (Non-metric Multidimensional Scaling) ordination revealed a chronosequence of the succession from jack pine stand to black oak (Quercus ...
Schroeder, Nathan - - 2012
In tallgrass prairie restoration, dominance by competitive late succession prairie grasses may cause loss of species that are poor competitors. In a field experiment we tested whether disturbance could reverse this process for Liatris scariosa var. nieuwlandii, a threatened savanna species thought to be a poor competitor. At our study ...
Gulezian, Paul - - 2012
Interactions between environmental variables in anthropogenically disturbed environments and physiological traits of invasive species may help explain reasons for invasive species' establishment in new areas. Here we analyze how soil contamination along roadsides may influence the establishment of Conium maculatum (poison hemlock) in Cook County, IL, USA. We combine analyses ...
Davis, Mark - - 2012
Garlic mustard, Alliaria petiolata (M. Bieb.) Cavara & Grande, is an introduced biennial forb that has commonly been referred to as highly invasive andas having substantial negative effects on other plants in the eastern deciduous forests of North America. However, several recent studies have documented only modest effects on other ...
Tavernia, Brian - - 2012
The exotic invasive wetland plant purple loosestrife (Lythrum salicaria) is often considered to have negative impacts on native plant and animal species, but this is debated. Clarifying its influence would provide insight into appropriate management actions following invasion. We investigated the influence of L. salicaria cover and density on abundances ...
Smith, Geoffrey - - 2012
Alterations of aquatic ecosystems, such as nutrient enrichment and changes in community composition, can potentially have effects that pervade the entire community. We investigated the effects of nutrient enrichment and changes in the presence and density of two species of tadpoles, American toad (Anaxyrus americanus) and Gray treefrog (Hyla versicolor), ...
Johnson, J. - - 2012
Understanding human impacts on biodiversity is a pressing challenge given the degree to which humans alter ecosystems. Urbanization is a prevalent example of human disturbance that often reduces species richness at the expense of dramatic population growth for certain urban-adapted taxa. The Western black widow spider, Latrodectus hesperus, is a ...
Riem, Jennifer - - 2012
Human development is changing the landscape in many ways that affect the distribution of wild species of mammals. Most previous work has focused on birds with only a few studies that examine the effects of urbanization on mammalian species. Using a combination of live trapping, track plates, and observation, we ...
Barrett, Dominic - - 2012
Examination of age structures and sex ratios is useful in the management of northern river otters (Lontra canadensis) and other furbearers. Reintroductions and subsequent recolonizations of river otters have been well documented, but changes in demographics between expanding and established populations have not been observed. As a result of reintroduction ...
Hoffman, Justin - - 2012
The adult sex ratio (ASR) is an important component of a population's demographics and can be used as an indicator of a population's status. However, the causes of annual variation in ASRs are unknown for many species. Fluctuations in ASR can arise through demographic stochasticity and intense selective harvesting. In ...
Hinton, Joseph - - 2012
Movement ecology of coyotes (Canis latrans) in the southeastern United States is poorly understood, despite the increasing recognition that coyotes are important predators throughout the region. During 2009-2011, we documented long-distance movements of three transient coyotes in northeastern North Carolina using Global Positioning System (GPS) collars. From their capture locations, ...
Ruell, E.W. - - 2012
Although habitat fragmentation is recognized as a primary threat to biodiversity, the effects of urban development on genetic population structure vary among species and landscapes and are not yet well understood. Here we use non-invasive genetic sampling to compare the effects of fragmentation by major roads and urban development on ...
Elizalde-Arellano, Cynthia - - 2012
Home range size, daily travel distances, and diel activity patterns are important characteristics of how an animal uses its home range area. In species, such as the bobcat (Lynx rufus), with large geographical ranges, it is necessary to gather data on diverse populations across the range to better understand what ...
Rulison, E.L. - - 2012
We compared relative impacts of habitat type vs. location in the diet of a generalist omnivore, the raccoon (Procyon lotor). Raccoon diets were analyzed from 161 scat samples collected in a marine coastal habitat over 13 mo. We used a suite of statistical tools including univariate indices of diversity, descriptive ...
Zarghouni, Mehrzad - - 2012
Nocardia intracranial abscesses occur almost exclusively in patients who are immunocompromised due to diabetes, transplantation, or HIV/AIDS. Patients usually present with seizures, headaches, fevers, and meningismus. Laboratory evaluation is nonspecific but may reveal an elevated erythrocyte sedimentation rate and white blood cell count. An important task in the workup of ...
Zarghouni, Mehrzad - - 2012
Granular cell tumors (GCTs) are generally benign neoplastic tumors of neural origin that have little malignant potential. These tumors may occur in any location, including the tracheobronchial tree. Although an endobronchial location is believed to represent a small percentage of cases, GCTs should be included in the differential considerations of ...
Benjamin, Mina - - 2012
Left ventricular noncompaction (LVNC) is a rare disorder in which the left ventricular endocardial surface is not appropriately flattened and is heavily trabeculated. Patients with this condition can be affected by stroke from emboli that originate from these recesses. We present a patient with LVNC who was originally misdiagnosed as ...
Sacks, Justin - - 2012
We present a case of a fatal toxic leukoencephalopathy following ingestion of a new psychoactive designer drug known as 2C-E or "Europa." Recreational drugs, particularly hallucinogenic substances, appear to be growing in popularity, with increasing amounts of information available via the Internet to entice potential users. In addition, some newer ...
Ray, M. - - 2012
Transjugular intrahepatic portosystemic shunt (TIPS) extension far into the inferior vena cava (IVC) or the right atrium may complicate or preclude orthotopic liver transplantation depending on the space available for placement of a hemostatic clamp in the suprahepatic IVC. Until 2004, most TIPS were performed with bare metal stents, which ...
Peters, Matthew - - 2012
Glycoprotein (GP) IIb/IIIa receptor antagonists are powerful antiplatelet agents that are typically used in percutaneous coronary intervention. All three GP IIb/IIIa agents currently approved for use in the United States cause thrombocytopenia as a rare side effect. Abciximab is unique to the class in that it is a modified monoclonal ...
Peters, Matthew - - 2012
Arrhythmogenic right ventricular cardiomyopathy (ARVC) is an infrequently diagnosed condition with a high incidence of sudden cardiac death. While the only option for cure is orthotopic cardiac transplantation, the use of an implantable cardiac defibrillator can be life saving. Accordingly, the prompt recognition of ARVC is crucial. Fortunately, a definitive ...
Levine, Harold - - 2012
This case study highlights the extracranial and intracranial manifestations of severe otomastoiditis. A 35-year-old man presented with numerous symptoms, including ear and neck pain, headache, temporary vision loss, fever, malaise, and nausea and vomiting. Imaging studies led to the diagnosis of coalescent mastoiditis with septic dural sinus thrombosis, venous hemorrhagic ...
Khvilivitzky, Katherine - - 2012
We report interruption of left ventricular assist device (VAD) support by way of outflow graft ligation and driveline excision while leaving the pump in situ. In this case, the indication for mechanical assist device separation was myocardial recovery, which occurred following 9 months of support. This case report demonstrates the ...
Jett, G. - - 2012
A da Vinci Robotic Surgical System was purchased for The Heart Hospital Baylor Plano in fall 2011 and a program for robotic-assisted thoracic surgery commenced at the facility. Successive thoracic patients were offered and accepted a robotic-assisted operation. No patient was excluded because of age, height, weight, or comorbidities. The ...
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