Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Ecotypes of Aquatic Plant Vallisneria americana Tolerate Different Salinity Concentrations

Version 1 : Received: 8 January 2020 / Approved: 10 January 2020 / Online: 10 January 2020 (06:49:09 CET)

A peer-reviewed article of this Preprint also exists.

Tootoonchi, M.; Gettys, L.A.; Thayer, K.L.; Markovich, I.J.; Sigmon, J.W.; Sadeghibaniani, S. Ecotypes of Aquatic Plant Vallisneria americana Tolerate Different Salinity Concentrations. Diversity 2020, 12, 65. Tootoonchi, M.; Gettys, L.A.; Thayer, K.L.; Markovich, I.J.; Sigmon, J.W.; Sadeghibaniani, S. Ecotypes of Aquatic Plant Vallisneria americana Tolerate Different Salinity Concentrations. Diversity 2020, 12, 65.

Journal reference: Diversity 2020, 12
DOI: 10.3390/d12020065

Abstract

Increased salinity caused by saltwater intrusion or runoff from de-icing salts can severely affect freshwater vegetation and deteriorate aquatic ecosystems. These habitats can be restored with freshwater ecotypes (locally adapted populations) that tolerate above-normal salinity. Vallisneria americana is a prominent species in many freshwater ecosystems that responds differently to abiotic conditions such as substrate composition and fertility, so in this study we evaluated the effects of salt stress on 24 ecotypes of V. americana. Instant Ocean aquarium salt was used to create saline solutions [0.2 to 20.0 parts per thousand (ppt)], then plants were abruptly exposed to these solutions and maintained in these concentrations for 5 weeks before being visually assessed for quality and destructively harvested. Analysis of variance and non-linear regression were used to calculate LC50 values – the lethal concentration of salt that reduced plant biomass and quality by 50% compared to control treatment. Growth rate and visual quality varied significantly among ecotypes, and ecotypes that were most and least sensitive to salt had 50% biomass reductions at 0.47 and 9.10 ppt, respectively. All ecotypes survived 10.0 ppt salinity concentration but none survived at 20.0 ppt, which suggests the maximum salinity concentration tolerated by these ecotypes is between 15.0 and 20.0 ppt.

Subject Areas

aquatic macrophytes; freshwater systems; salinity tolerance; intraspecific variation; lethal concentration; genotypic variability; ecotype; salt stress; effective concentration; growth rate

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