Effects of drawdowns and dessication on tubers of hydrilla, an exotic aquatic weed
2001
Doyle, Robert D. | Smart, R Michael
Subterranean turions (tubers) of hydrilla lose viability when desiccated. Experimental data showed that freshly collected tubers had a moisture content between 50 and 60%% and more than 90%% viability. When desiccated, there was an approximate 2%% increase in tuber mortality with each percent decline in moisture content. However under field conditions, the tuber bank within the exposed sediments of a northern Texas reservoir showed no decline in number or tuber viability throughout a 12-mo continuous drawdown. Apparently, the buried tubers were never subject to sufficient dessication to damage them. Finally, an experimental pond with an extensive hydrilla tuber bank was manipulated through six flood//drawdown cycles to determine the effects of short-term drawdowns on tuber survival and quiescence. Initially, the pond had a tuber bank of about 676 and 305 tubers m⁻⁻² in the shallow and deep zones, respectively. Although the tuber number was reduced to fewer than 15 to 30 tubers m⁻⁻² by these repetitive drawdowns, hydrilla tubers were not eradicated from the pond.Nomenclature: Hydrilla, Hydrilla verticillata (L.F.) Royle HYLLI.
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