Invasive eelgrass hybrid (Vallisneria × pseudorosulata) in the southeastern United States

Maxwell G. Gebhart; Samuel A. Schmid; Stephen Turner; David Webb; Ryan Thum; Jens Beets; Gray Turnage

doi:10.1017/inp.2024.37

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Maxwell G. Gebharthttps://orcid.org/0009-0008-2050-5459,^1,* Samuel A. Schmidhttps://orcid.org/0000-0001-9523-5459,¹ Stephen Turner,² David Webb,³ Ryan Thum,⁴ Jens Beets,⁵ Gray Turnage⁶

¹Research Associate, Mississippi State University - Geosystems Research Institute, Starkville, MS, USA
²Program Manager, Tennessee Valley Authority, Knoxville, TN, USA
³Senior Program Manager, Tennessee Valley Authority, Knoxville, TN, USA
⁴Professor, Montana State University, Bozeman, MT, USA
⁵Research Ecologist, USDA, Davis, CA, USA and
⁶Extension Research Professor, Mississippi State University - Geosystems Research Institute, Starkville, MS, USA

^*Corresponding author: Maxwell G. Gebhart; Email: mgebhart@gri.msstate.edu

Abstract

Vallisneria × pseudorosulata S. Fujii & M. Maki is an invasive aquatic weed that has recently become a major issue within the U.S. Southeast. Vallisneria × pseudorosulata is a hybrid between two nonnative eelgrass species (Vallisneria spiralis L. and Vallisneria denseserrulata Makino) and has rapidly overtaken water bodies in Tennessee, Alabama, and Florida. This hybrid can reproduce rapidly through offshoot formation and floating propagules capable of drifting large distances before establishing. Vallisneria × pseudorosulata has been previously found in Japan and is thought to have been introduced in the United States by the aquarium trade or through dumping.

Citation Download Citation

Maxwell G. Gebhart, Samuel A. Schmid, Stephen Turner, David Webb, Ryan Thum, Jens Beets, and Gray Turnage "Invasive eelgrass hybrid (Vallisneria × pseudorosulata) in the southeastern United States," Invasive Plant Science and Management 18(1), 1-5, (7 March 2025). https://doi.org/10.1017/inp.2024.37

Received: 23 September 2024; Accepted: 15 November 2024; Published: 7 March 2025

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