Journal
JOURNAL OF APPLIED WATER ENGINEERING AND RESEARCH
Volume 4, Issue 1, Pages 2-10Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/23249676.2015.1090352
Keywords
model validation; aquatic vegetation modeling; predicted habitat; endangered species; effectiveness monitoring
Categories
Funding
- Edwards Aquifer Habitat Conservation Plan
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The Upper San Marcos River is home to Texas wild rice (Zizania texana), an endangered aquatic macrophyte. Introduced aquatic plants Hydrilla verticillata and Hygrophila polysperma now occupy over 45% of the areal distribution. A two-dimensional hydraulic model was integrated with biological response functions for Zizania, Hydrilla, and Hygrophila to predict optimal locations for Zizania currently occupied by Hygrophila or Hydrilla. At these locations, non-native plants were manually removed and Zizania planted over approximately 20-50% of the exposed areas. Fixed grid locations were monitored bi-weekly over the next year to document plant responses. Monitoring showed a high success rate of expanding Zizania areal coverage and reductions in the non-native species distributions in restoration areas. Utilization of hydraulic modeling to direct spatially explicit aquatic plant restoration activities was shown to be an effective approach with a high success rate at identified restoration sites in the San Marcos River.
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