Jennifer Pontius

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Climate models project that by 2100, the northeastern US and eastern Canada will warm by approximately 3– 5 8C, with increased winter precipitation. These changes will affect trees directly and also indirectly through effects on ‘‘nuisance’’ species, such as insect pests, pathogens, and invasive plants. We review how basic ecological principles can be used(More)
The emerald ash borer (EAB) is an exotic insect pest currently threatening ash species in the Great Lakes region. Because of the potential impact on forests in this area, multiple government agencies are currently focusing their efforts on developing new technologies to detect, monitor and control this insect pest. Previous work has shown that hyperspectral(More)
Near-infrared reflectance spectroscopy was evaluated for its effectiveness at predicting pre-visual decline in eastern hemlock trees. An ASD FieldSpec Pro FR field spectroradiometer measuring 2100 contiguous 1-nm-wide channels from 350 nm to 2500 nm was used to collect spectra from fresh hemlock foliage. Full spectrum partial least squares (PLS) regression(More)
Preliminary data from 45 hemlock woolly adelgid monitoring plots across the Northeast indicate that a suite of macronutrients is strongly associated with adelgid infestation and hemlock decline. Although it is unclear whether specific chemical characteristics cause (palatability effect) or result (defensive strategy) from infestation, N, Ca, K, and Mn were(More)
Eastern hemlock (Tsuga canadensis) is a critical species in eastern North American forests, providing a multitude of ecological and societal benefits while also acting as a foundation species in many habitats. In recent decades, however, hemlock has become threatened by hemlock woolly adelgid (HWA; Adelges tsugae), an invasive sap-feeding insect from Asia.(More)
The hemlock woolly adelgid is a serious pest of Eastern and Carolina hemlock in the eastern United States. Successfully managing the hemlock resource in the region depends on careful monitoring of the spread of this invasive pest and the targeted application of management options such as biological control, chemical, or silvicultural treatments. To inform(More)
The in vitro effect of fresh frozen plasma (FFP) on the whole blood activated coagulation time (ACT) was examined in 18 patients undergoing cardiopulmonary bypass (CPB) during coronary artery bypass graft surgery. The addition of FFP to whole blood in vitro, after systemic heparinization, significantly prolonged the ACT from 451 +/- 21 seconds (mean +/- SE)(More)
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