Pyrethroid Bioaccumulation in Field-collected Insecticide-resistant Hyalella azteca

Pyrethroid and chlorpyrifos concentrations measured in field-collected insecticide-resistant Hyalella azteca and accompanying sediment samples published in Huff Hartz et al. 2021 (doi: 10.1007/s10646-021-02361-1). Consists of six tabs of data

Trophic Transfer, Bioaccumulation and Transcriptomic Effects of Permethrin in Inland Silversides, Menidia beryllina, under Future Climate Scenarios

This excel workbook contains data from a study of trophic transfer of radiolabeled (C-14) permethrin from pyrethroid-resistant Hyalella azteca to a known predator, the Inland silverside Menidia beryllina. Fish were fed 15 dosed (~ 1 ng/animal) or control H. azteca for 14 days at three temperatures, 18, 23 and 28°C, and three salinities (6, 13 and 20 PSU) to simulate changes anticipated under global climate change (GCC). Following feeding, fish were analyzed for total permethrin concentrations, as well as percent parent compound as a a measure of biotransformation, were measured in both H. azteca and M. beryllina

Effect of Bark Beetle Infestation on Secondary Organic Aerosol Precursor Emissions

Bark beetles are a potentially destructive force in forest ecosystems; however, it is not known how insect attacks affect the atmosphere. The emissions of volatile organic compounds (VOCs) were sampled i.) from bark beetle infested and healthy lodgepole pine (Pinus contorta var. latifolia) trees and ii.) from sites with and without active mountain pine beetle infestation. The emissions from the trunk and the canopy were collected via sorbent traps. After collection, the sorbent traps were extracted with hexane, and the extracts were separated and detected using gas chromatography/mass spectroscopy. Canister samples were also collected and analyzed by a multicolumn gas chromatographic system. The samples from bark beetle infested lodgepole pine trees suggest a 5- to 20-fold enhancement in total VOCs emissions. Furthermore, increases in the β-phellandrene emissions correlated with bark beetle infestation. A shift in the type and the quantity of VOC emissions can be used to identify bark beetle infestation but, more importantly, can lead to increases in secondary organic aerosol from these forests as potent SOA precursors are produced

Monoterpene Emissions from Bark Beetle Infested Engelmann Spruce Trees

Bark beetle infestation impacts the health of coniferous forests, which are an important source of volatile organic compounds (VOCs) to the atmosphere. The types and amounts of VOCs emitted from forests can influence secondary organic aerosol (SOA) formation and impact overall air quality. In this initial work, the impact of bark beetle infestation on SOA precursors from Engelmann spruce is assessed. The VOCs emitted from the trunk of infested and healthy spruce trees were sampled using both sorbent traps and evacuated canisters that were analyzed by gas chromatography/mass spectroscopy. The samples from the infested spruce tree suggest a nine-fold enhancement in the total VOC emissions. The dominant VOCs in the infested spruce trees were 3-carene, β-pinene, and α-pinene. The increase observed in VOCs sampled at the trunk of the infested spruce was consistent with increases observed at infested lodgepole pine trunks. However, the types and amounts of VOCs emitted from Engelmann spruce and lodgepole pine are different, which suggests that additional measures of VOC emissions are needed to characterize the impact of bark beetle infestation on VOC emissions and SOA precursors