2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/06/2017 | 3:15 PM - 3:30 PM | POTENTIAL EFFECTS OF THE INVASIVE CLAM, CORBICULA FLUMINEA, ON METHANE CYCLE PROCESSES IN AN URBAN STREAM | 306A
POTENTIAL EFFECTS OF THE INVASIVE CLAM, CORBICULA FLUMINEA, ON METHANE CYCLE PROCESSES IN AN URBAN STREAM
Lotic systems have recently been recognized as significant contributors to the global methane cycle. Organic matter decomposition in stream sediments can form localized anaerobic microsites where methanogenesis occurs. Methanogenesis and subsequent methane oxidation or efflux are subject to local biogeochemical conditions in the stream. The invasive clam, Corbicula, has been shown to affect stream biogeochemical processes and may also influence methane cycle processes. Distribution of Corbicula and anaerobic microsites within streams is highly variable and field surveys revealed no correlation between Corbicula and methane concentrations. Therefore, I used microcosm experiments to directly evaluate Corbicula’s effect on methane cycle processing rates. I manipulated Corbicula presence/absence and found that methane efflux increased in the presence of Corbicula, but there was no significant effect on methanogenesis. In an experiment manipulating Corbicula density I observed negative methane flux at low densities, indicating that oxidation was greater than methanogenesis. However, I observed positive methane flux in high density treatments. Increased respiration rates of dense Corbicula populations may promote reducing conditions in sediments, enhancing methanogenesis and lowering the potential for oxidation.
- C03 Invertebrates
- C08 Urban Ecology
- C10 Biogeochemistry
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Presenters/Authors
Robert Brown
(), Tennessee Tech University, rsbrown43@tntech.edu;
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Anne Hershey
(), The University of North Carolina at Greensboro, aehershe@uncg.edu;
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