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6/06/2017  |   9:45 AM - 10:00 AM   |  Examining Riverine Dispersal of Zebra Mussels (Dreissena polymorpha) and the Invasion Risks to Texas Reservoirs and Streams   |  305A

Examining Riverine Dispersal of Zebra Mussels (Dreissena polymorpha) and the Invasion Risks to Texas Reservoirs and Streams

The zebra mussel, Dreissena polymorpha, has recently spread into Central Texas waterways and research is needed to predict their spread and develop informed management strategies. We therefore examined riverine dispersal downstream of two lakes in Central Texas, where zebra mussels were first detected in 2013 and 2016, by monitoring dispersal of veligers, settlement, and growth of juveniles. Preliminary data suggest that settlement rates vary both spatially and temporally and may depend largely on variation in temperature and flow. While juvenile settlement was restricted to <13 rkm downstream of Lake Belton in 2015, they were found up to 55km downstream after prolonged periods of increased discharge in 2016. Veliger density and juvenile settlement was highest in spring and lowest in August likely due to temperature limitation. In addition, we are using an existing spatially-explicit ecological model that considers boater traffic and integrates it with physic-chemical measurements from Texas lakes to quantify the risk of establishment of zebra mussels in Texas.

  • C15 Population Ecology
  • C03 Invertebrates
  • C26 Invasive Species

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Presenters/Authors

Josi Robertson (), Texas State University, jjr131@txstate.edu;


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Todd Swannack (), UNITED STATES ARMY ENGINEER RESEARCH AND DEVELOPMENT CENTER, Todd.M.Swannack@erdc.dren.mil;


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Astrid Schwalb (), Texas State University, schwalb@txstate.edu;


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