Katherine Palmquist, Ph.D.

Dr. Palmquist has a strong interdisciplinary background in insect biology/physiology, toxicology, Integrated Pest Management, and communications. Dr. Palmquist has experience in aquatic entomology and aquatic toxicology concerning the sublethal effects of insecticide exposure to aquatic invertebrates, specifically aquatic insect life history variables in relation to insects’ sensitivity to synthetic pyrethroid insecticides. Additionally, she has experience with terrestrial and agroecosystem insect ecology and has been involved with the Integrated Pest Management programs in both Oregon and Washington states.

Dr. Palmquist has four years experience in designing and implementing novel laboratory studies utilizing field-collected stream invertebrates. She has developed and published methodology concerning the laboratory maintenance and rearing of several stream insect species. Additionally, she has experience in performing lotic and lentic benthic surveys, as well as terrestrial insect field sampling.

Palmquist KR, Jenkins JJ, Jepson PC. Effects of dietary esfenvalerate exposure on three aquatic insects species representing different functional feeding groups. Environ Toxicol Chem 2008; 27(8): 8–14.

Palmquist KR, Jenkins JJ, Jepson PC. Impact of aquatic insects life stage and emergence strategy on sensitivity to esfenvalerate exposure. Environ Toxicol Chem 2008; 27(8):1–7.

Palmquist KR, Jenkins JJ, Jepson PC. Clutch morphology and timing of exposure impact the susceptibility of aquatic insects eggs to esfenvalerate. Environ Toxicol Chem 2008; 27(8):52–59.

Johnson KR, Jepson PC, and Jenkins JJ. Esfenvalerate-induced case-abandonment adversely impacts Brachycentrus americanus behavior and survival. Environ Toxicol Chem 2008; 27 (2):397–403.

Johnson JD, Johnson KR. Hybrid poplar genotype affects attack incidence by the Poplar-and-Willow Borer (Cyptorhynchus lapathi). West J Appl For 2003; 18: 276–280.

Presentations

Palmquist KR, Jenkins JJ, Jepson PC. Impact of aquatic insects life stage and emergence strategy on sensitivity to esfenvalerate exposure. Presented at the Pacific Branch Society of Environmental Chemistry and Toxicology Meeting and at the North American Benthological Society Meeting, 2008.

Johnson KR, Jenkins JJ, Jepson PC. Clutch morphology and the timing of exposure impact the susceptibility of aquatic insect eggs to esfenvalerate. Presented at the Society of Environmental Chemistry and Toxicology 28th Annual Meeting, 2007.

Johnson KR, Jenkins JJ, Jepson PC. Use of multiple life stages in assessing Cinygmula sp. mayfly nymph sensitivity to esfenvalerate. Presented at the Pacific Northwest Branch Society of Environmental Chemistry and Toxicology Meeting, Port Townsend, WA and presented at the Pacific Branch Entomological Society of America 91st Annual Meeting, Portland, OR, 2007.

Johnson KR. Pesticide sub-lethal effects in non-target aquatic organisms. Presented at Washington State University Pesticide Re-certification short courses, Lacey & Vancouver, WA, 2007.

Johnson KR, Jenkins JJ, P.C. Jepson. Esfenvalerate and chlorpyrifos differentially affect native Pacific Northwest aquatic insects. Presented at the American Chemical Society 232nd Annual Meeting, San Francisco, CA, 2006.

Johnson KR, Jenkins JJ, Jepson PC. Life stage influences Pacific Northwest aquatic insect susceptibility to esfenvalerate. Presented at the North American Benthological Society 54th Annual Meeting, Anchorage, AK, 2006.

Johnson KR, Jenkins JJ, Jepson PC. Esfenvalerate induces case-leaving in the Pacific Northwest caddisfly Brachycentrus americanus. Presented at the Society of Environmental Toxicology and Chemistry 26th Annual Meeting, Baltimore, MD, 2005.

Designed and coordinated laboratory experiments at Oregon State University to determine the impact of aquatic insect life history strategies and exposed life stage on pyrethroid insecticide sensitivity. Potentially sensitive life stages, morphologies and behaviors were explored during the course of these studies: 

– Examined the influence of egg clutch morphology on esfenvalerate susceptibility in terms of hatchability, post-hatch neonate survivorship, and growth for three species of aquatic insect (Baetis sp mayfly, Brachycentrus americanus caddisfly, Hesperoperla pacifica stonefly) 

– Defined Brachycentrus americanus caddisfly larval case-abandonment as a sub-lethal effect of esfenvalerate exposure, and determined impact on survivorship 

– Determined toxic availability of particulate-bound esfenvalerate for trophic uptake and the affect of functional feeding strategy on consumption rates of three aquatic insect species 

– Established the susceptibility of late-stage aquatic insects to esfenvalerate, and quantifying the effect on fecundity.

Performed lotic and lentic aquatic invertebrate samplings in Oregon and Washington states to obtain insect specimens for use in laboratory experiments and university collections, with proficiency in field and laboratory identifications of several aquatic insect taxa.

Assisted in agroecosystem insect sampling, species identification, and data collection for WSU research on the impacts of chemical and biological control methods on insect generalist predator populations in Washington State potato fields. Sampled surface- and canopy- active insects in both Oregon and Washington states.

• Society of Environmental and Molecular Toxicology (current member)
• North American Benthological Society (current member)
• Entomological Society of America (former member)
• American Chemical Society (former member)