Poster Presentation Society for Freshwater Science 2025 Annual Meeting

Microbial abundance and function associated with invasive plants and mitigation techniques (117634)

Madison Brown 1 , Jessica Ernakovich 2 , Benjamin Abbott 3 , Rachel Wood 1
  1. Biology, Brigham Young University, Provo, UT, United States
  2. Natural Resources and the Environment, University of New Hampshire, Durham, New Hampshire, United States
  3. Plant and Wildlife Sciences, Brigham Young University, Provo, UT, United States

Wetland soils and their microbial communities play major roles in global nutrient cycling and water filtration. However, these delicate resources experience growing pressures that put such services as carbon sequestration and nutrient mitigation at risk. Invasive wetland plants like Phragmites australis ssp. australis have caused extensive ecological and economic damage to wetlands across the globe. In addition to the well-known concerns over Phragmites spread, such as habitat loss and hydrological imbalances, Phragmites can have tremendous influence over soil physicochemical properties and, therefore, on the soil microbial community and its associated functional capacity. Invasive management techniques like herbicide application are used extensively in the wetlands of Utah Lake and Great Salt Lake in northern Utah to control the spread of Phragmites, and such techniques can also have strong yet unquantified effects on soil and its microorganisms. Using the cosmopolitan Phragmites as a model organism can provide insights into microbial community change along the gradient of plant invasion and subsequent removal. We collected soil physicochemical and environmental molecular data from 75 wetland sites in Northern Utah, sampled three times each in the summer of 2022. With these data, we have compared the species composition and predicted function of microbial communities from soils dominated by invasive Phragmites, soils dominated by native vegetation, and soils that have received treatments to remove Phragmites. Preliminary results support the concept of tradeoffs to invasive plant removal; that invasive mitigation treatments can negatively impact soil microbial abundance and functional capacity, with implications for biogeochemical cycling.