Abstract
The Green Sturgeon is a long-lived anadromous fish known to spawn in only three locations. Southern Distinct Population Segment (DPS) Green Sturgeon spawn only in the Sacramento drainage, while the Northern DPS spawns in the Klamath and Rogue rivers. In 2011, a young of year (YOY) Green Sturgeon was captured in the Columbia River below Bonneville Dam, providing preliminary evidence of a fourth spawning location. In 2017, four additional Green Sturgeon YOY of similar size were captured in the Columbia River below Bonneville Dam. Genetic analysis of all YOY samples indicates that they belong to the Northern DPS, confirming that the Northern DPS actually spawns in at least three locations. The detection of Green Sturgeon spawning in the Columbia River only in years with relatively high spring flow (2011, 2017), combined with confirmed correlations between flow and spawning for other White and Green Sturgeon populations, suggests that appropriate spawning conditions may only exist above a specific flow threshold. The Columbia River has the potential to play an important role in Green Sturgeon climate change adaptation due to its location at the northernmost end of the species’ reproductive range. We recommend future research to better quantify Green Sturgeon recruitment magnitude, frequency and dynamics in the Columbia River.
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Acknowledgements
Thank you to Kevin Rybacki, Michael Lovejoy and Eric Anderson for field collection of the specimens. Thanks to Josh Israel for providing the Northern and Southern DPS genetic baselines. We’d also like to thank Alisha Goodbla and Grace Auringer for help with qPCR and microsatellite genotyping of YOY samples. The manuscript was improved with helpful comments from reviewers.
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Schreier, A.D., Stevens, P. Further evidence for lower Columbia River green sturgeon spawning. Environ Biol Fish 103, 201–208 (2020). https://doi.org/10.1007/s10641-019-00945-9
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DOI: https://doi.org/10.1007/s10641-019-00945-9