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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | The Historical Prevalence of Cyanobacteria in Pass Lake, Skagit County, Washington |
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The Historical Prevalence of Cyanobacteria in Pass Lake, Skagit County, Washington (Number of pages: 20) (Publication Size: 1328KB)
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| Author(s) | Hobbs, W. | ||||
| Description | Pass Lake in Skagit County (Washington) experiences annual harmful cyanobacterial blooms that produce high concentrations of the toxins, anatoxin-a and microcystin. The goal of this project was to understand whether cyanobacteria have been a dominant part of the lake phytoplankton historically. A 70cm sediment core was collected and an age-depth model established a chronology of sediment accumulation back to roughly 1600 AD (~400 years). Sediment accumulation rates showed a period of increased accrual starting in the 1930s (and ending around 1975) — when the lake shoreline was initially developed by the Civilian Conservation Corps for Deception Pass State Park. Algal pigments representative of cyanobacteria were measured in the historical sediment deposits (~400 years old) along with the microcystin-producing gene marker McyE. Data from this study suggests that cyanobacteria were historically present in Pass Lake; however, degradation of some of the pigments and gene markers prevented establishing a detailed long-term history for the lake. Opportunistic water samples were collected and analyzed by qPCR for genetic indicators of toxin production and nitrogen fixation. The samples showed an abundance of toxin-producing genes for microcystin and anatoxin-a; this coincided with very high measured concentrations of these toxins during routine shoreline sampling around the same time. |
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| Contact | EAP Publications Coordinator at 564-669-3028 or EAPpubs@ecy.wa.gov | ||||
| Keywords | qPCR, sediment core, anatoxin-a, microcystin, toxin, sampling, Skagit, sediment, cyanobacteria, Pass Lake | ||||
| WATERSHED | Water Resource Inventory Area 03 Lower Skagit-Samish | ||||
| 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 Quality Assurance Project Plan: Prevalence and Persistence of Cyanotoxins in Lakes of the Puget Sound Basin |
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