Title:

Willamette River decadal assessment fish dataset

Author(s):

Penaluna, Brooke E.; Gregory, Stanley V.; Wildman, Randall; Giannico, Guillermo R.; Pollock, Amanda M.

Publication Year:

2025

How to Cite:

These data were collected using funding from the U.S. Government and can be used without additional permissions or fees. If you use these data in a publication, presentation, or other research product please use the following citation:

Penaluna, Brooke E.; Gregory, Stanley V.; Wildman, Randall; Giannico, Guillermo R.; Pollock, Amanda M. 2025. Willamette River decadal assessment fish dataset. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2024-0057

Abstract:

Natural habitats and communities may change for a variety of reasons but understanding if a change has occurred and its extent requires knowing the original state. The Willamette River Decadal Assessment is an extensive survey primarily of the middle and upper portions of the Willamette River, Oregon, serving as a measurement of baseline conditions for future decades. This Willamette Decadal Assessment fish dataset consists of tabular data from freshwater fish surveys over multiple years in 2 decades, 2011-2013 and 2021-2023. Each decade contains sampling locations within the Willamette River between the mouth (confluence with Columbia River) and the upstream confluence with the McKenzie River. Sampling sites used the SLICES framework for dividing the Willamette River into approximately 1 kilometer river sections of either the mainstem river or off-channel slough areas. Thirteen sentinel slices were included in the survey each year, although sampling some slices was not permitted in certain years due to high water temperatures. Additional sampling sites were randomly selected from the remaining slices. Sampling included boat electroshocking passes and backpack electrofishing samples. Captured native and nonnative individuals were identified to species, except for lamprey. Fish observed but not captured or measured are identified by a separate code. Tabular data include information such as GPS coordinates, fish length, weight, mortality, and species.

Keywords:

biota; environment; inlandWaters; Ecology, Ecosystems, & Environment; Animal ecology; Inventory, Monitoring, & Analysis; Assessments; Resource inventory; Wildlife (or Fauna); Fish; Willamette River Decadal Assessment; freshwater fish; fish surveys; electroshocking; population assessment; Oregon; western Oregon; Willamette River

Related publications:

• Penaluna, Brooke E.; Gregory, Stanley V.; Wildman, Randall; Giannico, Guillermo R.; Pollock, Amanda M. Unknown. A large river in transition: Declining native fish abundance amidst rise of nonnative fishes in the Willamette River. [In review].
• Williams, Joshua E.; Gregory, Stanley V.; Wildman, Randall. 2024. Fish assemblage structure and habitat relationships of a large floodplain river in western North America. River Research and Applications. 40(5): 809-820. https://doi.org/10.1002/rra.4273

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