Entry #134

Common snapping turtles (Chelydra serpentina) are an invasive species found increasingly on a global scale. They are native to eastern North America, but are found throughout the western United States. Despite reports of snapping turtles dating back decades in Oregon, a systematic examination of their distribution and natural history in areas outside of their native range in North America has been lacking. By documenting their distribution and general characteristics, researchers can implement management strategies to better protect native biodiversity. The goal of this study was to review where common snapping turtles have been documented outside of their native range, document spatial-temporal patterns, and determine morphological and reproductive characteristics of snapping turtles in Oregon as a case study. Data was collected between 2004–2024 via targeted surveys and verified public-reported observations, and was analyzed using spatial-temporal analyses. Snapping turtles are primarily found in western Oregon, and specifically in the Portland area. Eighty-eight percent of turtles were found within 200 m of waterbodies, and half of all turtles were in parks. Sightings were most common in June. The public has played a large role in data collection. More surveys, as well as continued public outreach, are required to fully understand the true distribution and extent of this invasive species’ threat to native biodiversity in Oregon and other areas of western North America.