R Tutorial Video Series for Undergraduates
I created a series of 8 video tutorials for R novices who need to analyze and visualize data for classes or research.
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portfolio
publications
Avian migrants encounter higher temperatures but continue to add mass at an inland stopover site in the Great Lakes region
Published in Journal of Avian Biology, 2021
To quantify changes in songbird arrival patterns at stopover sites during fall migration we analyzed forty years of banding data in nine passerine species commonly captured at banding stations in southwestern Michigan.
Recommended citation: VanTol, S.D., Koehn, C.R., Keith, R., Keith, B., & Proppe, D.S. (2021). Avian migrants encounter higher temperatures but continue to add mass at an inland stopover site in the Great Lakes region. Journal of Avian Biology, 52(4).
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Botanical Assessment of High-quality Woodland Parcels of the Undeveloped Lowell Regional Greenspace, Kent County, MI
Published in The Great Lakes Botanist, 2021
Nine wooded sites within the Lowell Regional Greenspace property that appear to be high-quality habitat were identified for floristic inventories and floristic quality assessments during the summers of 2018 and 2019.
Recommended citation: Warners, D.P., Crow, G.E., Walt, J.D., Koehn, C.R., Hartwig, Z.E., & Clum, D. (2021). Botanical Assessment of High-quality Woodland Parcels of the Undeveloped Lowell Regional Greenspace, Kent County, MI. The Great Lakes Botanist, 60(3-4), 110.
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Seasonal Precipitation and Soil Moisture Relationships Across Forests and Woodlands in the Southwestern United States
Published in Journal of Geophysical Research: Biogeosciences, 2021
We evaluated seasonal precipitation and soil moisture relationships at shallow (0–20 cm) and intermediate (50 cm) soil depths for nine semiarid forest and woodland sites (56 total years), which comprised three elevation gradients in the southwestern US.
Recommended citation: Koehn, C.R., Petrie, M.D., Bradford, J.B., Litvak, M.E., & Strachan, S. (2021). Seasonal Precipitation and Soil Moisture Relationships Across Forests and Woodlands in the Southwestern United States. Journal of Geophysical Research: Biogeosciences, 126(4), e2020JG005986.
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Botanical Assessments of High-Quality Southern Shrub-Carr and Hardwood Swamp Wetlands in the Undeveloped Lowell Regional Greenspace, Kent County, Michigan
Published in The Great Lakes Botanist, 2022
Four wetlands located in the same drainage basin along Karen Creek in the Lowell Regional Greenspace were inventoried for floristic quality assessments during the summers of 2016, 2018, 2019, and 2021.
Recommended citation: Crow, G.E., Warners, D.P., Weesies, H.R., Walt, J.D., Hartwig, Z.E., & Koehn, C.R. (2022). Botanical Assessments of High-Quality Southern Shrub-Carr and Hardwood Swamp Wetlands in the Undeveloped Lowell Regional Greenspace, Kent County, Michigan. The Great Lakes Botanist, 61(1-2): 2, 2–34.
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Not Only Severe Events: Moderate Dry Periods Impact the Hydraulic Functioning and Survival of Planted Ponderosa Pine Seedlings
Published in Forests, 2022
We conducted a controlled field experiment at a single site in the Front Range of Colorado, USA, to determine the responses and survival of 3 Colorado subpopulations of <1 year old potted ponderosa pines to moderately dry conditions, variation in small rainfall events based on observed patterns, and shaded and unshaded microsite environments.
Recommended citation: Koehn, C.R., Petrie, M.D., & Hubbard, R.M. (2022). Not Only Severe Events: Moderate Dry Periods Impact the Hydraulic Functioning and Survival of Planted Ponderosa Pine Seedlings. Forests, 13, 370.
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Systematic conservation planning for private working lands: Identifying agricultural protection areas for climate solutions, biodiversity habitat, and ecosystem services
Published in Biological Conservation, 2024
We combined Systematic Conservation Planning (SCP) principles, optimization algorithms, and the Ecosystem Service framework to identify potential APAs and explore the trade-offs in promoting the multifunctionality of agricultural land.
Recommended citation: Halperin, S., Koehn, C.R., Johnson, K.K., & Brandt, J.S. (2024). Systematic conservation planning for private working lands: Identifying agricultural protection areas for climate solutions, biodiversity habitat, and ecosystem services. Biological Conservation, 297, 110735.
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Conservation easements target high quality lands but do not increase their quality
Published in Biological Conservation, 2025
Private land conservation programs typically focus on maximizing acres enrolled, but their outcomes are less studied. We used a counterfactual approach to measure the efficacy of private land protection investments in a high-value conservation region of the western United States, where private agricultural lands provide critical habitats that are not well-protected by public protected areas, but are highly vulnerable to development.
Recommended citation: Kolarik, N.E., Cattau, M., Koehn, C., Roopsind, A., Williamson, M., & Brandt, J. (2025). Conservation easements target high quality lands but do not increase their quality. Biological Conservation, 308, 111234.
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talks
Talk 1 on Relevant Topic in Your Field
Published:
This is a description of your talk, which is a markdown file that can be all markdown-ified like any other post. Yay markdown!
Conference Proceeding talk 3 on Relevant Topic in Your Field
Published:
This is a description of your conference proceedings talk, note the different field in type. You can put anything in this field.
teaching
Introduction to Spatial Data in R (Instructor of Record)
Graduate course, Boise State University, Human-Environment Systems, 2024
I served as instructor of record for the graduate class HES 505: Introduction to Spatial Data in R in the fall of 2024. This course was designed and previously taught by Dr. Matt Williamson. I taught the course with some modifications – notably, the addition of coding activities to most class sessions. The course syllabus, content, and activities (examples) can be found on the course website.
R Tutorial Video Series for Undergraduates (Teaching Assistant)
Workshop, Boise State University, Biology Department, 2025
I created a series of 8 video tutorials for R novices who need to analyze and visualize data for classes or research. Links to the videos, code, follow-up activities, and references are currently hosted on this Google Sheet. A university webpage to host these resources is under construction.