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Title

The Historical Prevalence of Cyanobacteria in Spanaway Lake, Pierce County, Washington

 
Publication number Date Published
22-03-009March 2022
VIEW NOW The Historical Prevalence of Cyanobacteria in Spanaway Lake, Pierce County, Washington (Number of pages: 19) (Publication Size: 1308KB)




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Author(s) W. Hobbs , E. Frame , F. Sweeney, I. Struewing, N. Sienkiewicz, J. Lu , E. Villegas and R. Labiosa
Description Spanaway Lake in Pierce County (Washington) experiences annual harmful cyanobacterial blooms that produce high concentrations of the toxin, microcystin. The goal of this project was to understand whether (1) cyanobacteria have been a dominant part of the lake phytoplankton historically (~150 years ago) or (2) microcystin was produced historically. A sediment core representing the last ~150 years was analyzed for fossil algal pigments, microcystin concentrations, and microcystin-producing genes.

The pigment analysis of the sediments recorded a diverse cyanobacteria community in the lake, extending back to about 1850. Microcystin compounds (MCs) and copies of cyanobacterial 16S rRNA gene were measured throughout the sediment core. Overall, Spanaway Lake has a long history of cyanobacteria production; however, changes in the pigment abundance and microcystin-producing genes suggest that after 1985 the lake has had a greater dominance of cyanobacteria with higher levels of toxin production.
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Contact Will Hobbs at 360-407-6764 or whob461@ecy.wa.gov
Keywords Spanaway Lake, qPCR, sediment core, microcystin, cyanobacteria, pigment
WATERSHED Water Resource Inventory Area 12 Chambers-Clover
DATA Environmental Information Management (EIM) #WHOB008

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