Fig. 1

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Map of the San Marcos River (left) depicting dams, river segments, and study plots in relation to Texas and the United States (upper right). Location of study plots where hydrilla was removed in different percentages and planted with water stargrass and Texas wild rice (bottom right). Research site 1 (29° 52’ 53.21” N, 97 56’ 04.40” W) and 2 (29° 52’ 49.67” N, 97 56’ 01.73” W) were in river segment C and site 3 (29° 52′ 48.98′ N, 97 55′ 59.03′ W) was located in river segment D. Segments represent boundaries established by the Texas Parks and Wildlife Department based on permanent boundaries (roads, dams, and tributaries).

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