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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | Prevalence and Persistence of Cyanotoxins in Lakes of the Puget Sound Basin: Cyanotoxin production in Spanaway Lake (Pierce County, Washington) during the summer of 2021 |
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Prevalence and Persistence of Cyanotoxins in Lakes of the Puget Sound Basin: Cyanotoxin production in Spanaway Lake (Pierce County, Washington) during the summer of 2021 (Number of pages: 56) (Publication Size: 6720KB)
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| Author(s) | Hobbs, W. | ||||
| Description | Cyanobacteria (or blue-green algae) are common in many inland waters worldwide. Several planktonic cyanobacteria species can produce toxins that harm humans, pets, and wildlife. Spanaway Lake in Pierce County (Washington) has a history of cyanobacterial blooms. The current project in Spanaway Lake (1) documented the succession of cyanobacteria from May to October, (2) measured toxins and toxin-producing genes in the water column, and (3) explored associations among nutrients, cyanobacteria communities, and cyanotoxin production. Weekly profiling of the water column demonstrated that by early June, the water column was strongly stratified, and the bottom waters contained very little oxygen; there was early summer growth of cyanobacteria in the lake’s bottom waters. In late July and early August, phycocyanin (PC, a cyanobacteria pigment) concentrations peaked at a depth of 5m, and subsequently, PC was measured throughout the water column until October. In the anoxic bottom waters and at the sediment surface, there was an increase of ammonia, iron, and dissolved inorganic phosphorus from the sediments beginning in early August; cyanobacteria growth had moved further up in the water column. Microcystis aeruginosa was a small component of the cyanobacteria biomass but likely produced the microcystin measured in Spanaway Lake. The expression of the Microcystin genes (Mcy) was high between July and September. Genes covering all major microcystin-producing genera (McyE) and genes attributable to Microcystis (McyA) dominated. The microcystin concentration in the water positively correlated to McyA gene expression with a 2 – 3 week lag. There was a strong relationship between cyanobacteria growth (and microcystin production) and available nutrients. Cyanobacteria growth occurred mainly during periods of limited available nitrogen relative to phosphorus. |
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| Contact | William Hobbs at 360-995-3369 or william.hobbs@ecy.wa.gov | ||||
| Keywords | Spanaway Lake, qPCR, microcystin, toxin, cyanobacteria | ||||
| WEB PAGE | Lake water quality monitoring & protection | ||||
| WATERSHED | Water Resource Inventory Area 12 Chambers-Clover | ||||
| DATA | Environmental Information Management (EIM) #WHOB008 |
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| RELATED PUBLICATIONS | Title:
The Historical Prevalence of Cyanobacteria in Spanaway Lake, Pierce County, Washington Addendum 3 to Quality Assurance Project Plan: Prevalence and Persistence of Cyanotoxins in Lakes of the Puget Sound Basin Addendum 2 to Quality Assurance Project Plan: Prevalence and Persistence of Cyanotoxins in Lakes of the Puget Sound Basin Exploring the Use of Fluorometric Sensors to Monitor Harmful Algal Blooms in Lakes Quality Assurance Project Plan Addendum: Prevalence and Persistence of Cyanotoxins in Lakes of the Puget Sound Basin The Prevalence of Cyanobacteria: A historical perspective from lake sediment Quality Assurance Project Plan: Prevalence and Persistence of Cyanotoxins in Lakes of the Puget Sound Basin |
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