2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 11:15 AM - 11:30 AM | HOW DO YOU MEASURE A YEAR IN THE LIFE? EXAMINING ECOSYSTEM-WIDE RESPONSES TO ANNUAL SENESCENCE OF INVASIVE HYDRILLA IN UPLAND STREAMS OF THE CUMBERLAND PLATEAU | 251 DE
HOW DO YOU MEASURE A YEAR IN THE LIFE? EXAMINING ECOSYSTEM-WIDE RESPONSES TO ANNUAL SENESCENCE OF INVASIVE HYDRILLA IN UPLAND STREAMS OF THE CUMBERLAND PLATEAU
Aquatic macrophytes are essential to the structure and function of freshwater ecosystems. Macrophytes with annual growth influence nutrient availability in the water between periods of growth when they are nutrient sinks and senescence when they are nutrient sources. This natural process can have profound effects on native communities where a non-native macrophyte has invaded and successfully colonized, as no evolutionary relationship exists between a native community and its exotic invader. The invasion of monoecious hydrilla (Hydrilla verticillata), an exotic aquatic macrophyte that smothers streambeds with profuse growth, was discovered in the Emory River Watershed of eastern Tennessee in August 2007. Monoecious hydrilla experiences annual growth characterized by winter senescence of shoots, giving it the potential to alter algal and associated invertebrate communities in response to nutrient and detritus influx. This study examines the effects of growing and senescent seasons on dissolved nutrients, algal colonization, and macroinvertebrate communities. Higher nutrient levels, higher periphyton biomass, and a shift in invertebrate functional feeding groups are predicted for periods of senescence relative to periods of growth. Understanding the temporal effects of hydrilla is necessary for making efficient and low-impact decisions regarding management endeavors.
- Macrophyte
- Invertebrate
- Nutrients
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Presenters/Authors
Sandra Bojic
(), Austin Peay State University, sbojic@my.apsu.edu;
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