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Accession Number PB2012-114697
Title Lake Granbury and Lake Whitney Assessment Initiative.
Publication Date Oct 2010
Media Count 122p
Personal Author B. Brooks B. L. Harris D. Roelke J. Grover
Abstract Our in-lake monitoring revealed that golden algae are present throughout the year, even in lakes where blooms do not occur. Compilation of our field monitoring data with data collected by Texas Parks and Wildlife and Brazos River Authority (a period spanning a decade) revealed that inflow and salinity variables affect bloom formations. Thresholds for algae populations vary per lake, likely due to adaptations to local conditions, and also to variations in lake-basin morphometry, especially the presence of coves that may serve as hydraulic storage zones for P. parvum populations. More specifically, our in-lake monitoring showed that the highly toxic bloom that occurred in Lake Granbury in the winter of 2006/2007 was eliminated by increased river inflow events. The bloom was flushed from the system. The lower salinities that resulted contributed to golden algae not blooming in the following years. However, flushing is not an absolute requirement for bloom termination. In Lake Whitney, the highly toxic bloom that occurred that same winter was also stopped by high river inflow events. Flushing, however, did not terminate this bloom as the lake rose 10 feet but no water was released from the dam at this time. It was the influx of nutrients that stopped toxin production. This, coupled with the high rates of photodegradation for P. parvum toxins (which we determined in laboratory experiments), allowed other phytoplankton to out-compete golden algae.
Keywords Adaptations
Lake Granbury
Lake Whitney

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 48B - Natural Resource Management
91A - Environmental Management & Planning
98D - Agronomy, Horticulture, & Plant Pathology
57C - Botany
Corporate Author Texas A and M Univ., College Station. Water Resources Inst.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1226
Contract Number DE-FG02-08ER64604

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