Record Details

Spawning Patterns of Pacific Lamprey in Tributaries to the Willamette River, Oregon

ScholarsArchive at Oregon State University

Field Value
Title Spawning Patterns of Pacific Lamprey in Tributaries to the Willamette River, Oregon
Names Mayfield, M. P. (creator)
Schultz, L. D. (creator)
Wyss, L. A. (creator)
Clemens, B. J. (creator)
Schreck, C. B. (creator)
Date Issued 2014-10-21 (iso8601)
Note To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The article is copyrighted by the American Fisheries Society and published by Taylor & Francis. It can be found at: http://www.tandfonline.com/loi/utaf20#.VMa59WMyz5w.
Abstract Addressing the ongoing decline of Pacific Lamprey Entosphenus tridentatus across its range along the west coast
of North America requires an understanding of all life history phases. Currently, spawning surveys (redd counts)
are a common tool used to monitor returning adult salmonids, but the methods are in their infancy for Pacific
Lamprey. To better understand the spawning phase, our objective was to assess temporal spawning trends, redd
abundance, habitat use, and spatial patterns of spawning at multiple spatial scales for Pacific Lamprey in the
Willamette River basin, Oregon. Although redd density varied considerably across surveyed reaches, the observed
temporal patterns of spawning were related to physical habitat and hydrologic conditions. As has been documented
in studies in other basins in the Pacific Northwest, we found that redds were often constructed in pool tailouts
dominated by gravel, similar to habitat used by spawning salmonids. Across the entire Willamette Basin, Pacific
Lampreys appeared to select reaches with alluvial geology, likely because this is where gravel suitable for spawning
accumulated. At the tributary scale, spawning patterns were not as strong, and in reaches with nonalluvial geology
redds were more spatially clumped than in reaches with alluvial geology. These results can be used to help identify
and conserve Pacific Lamprey spawning habitat across the Pacific Northwest.
Genre Article
Topic Columbia River
Identifier Mayfield, M. P., Schultz, L. D., Wyss, L. A., Clemens, B. J., & Schreck, C. B. (2014). Spawning Patterns of Pacific Lamprey in Tributaries to the Willamette River, Oregon. Transactions of the American Fisheries Society, 143(6), 1544-1554. doi:10.1080/00028487.2014.949013

© Western Waters Digital Library - GWLA member projects - Designed by the J. Willard Marriott Library - Hosted by Oregon State University Libraries and Press