2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

5/20/2019 | 11:00 AM - 11:15 AM | EXPLORING PLANKTONIC RESPIRATION USING SHORT-TERM IN SITU MEASUREMENTS | 250 AB

EXPLORING PLANKTONIC RESPIRATION USING SHORT-TERM IN SITU MEASUREMENTS

Planktonic community respiration (CR) is a fundamental driver of aquatic processes including organic matter (OM) metabolism and mineralization, atmospheric gas exchange, and energy flow through food webs. Recent work suggests that CR may often be underestimated, in part because standard incubation approaches that track the loss of dissolved oxygen in the dark do not capture the rapid turnover of highly labile OM. Here we use novel short-term (<1hr) in situ protocols to demonstrate that CR may be grossly underestimated in the open-water zones of both freshwater and marine habitats, with non-linear rates of change over even short incubation periods. Further, we use these protocols to demonstrate higher than expected extents of both spatial and temporal variability within inland and tidally-influences coastal systems. We explore the connections between variability in CR and environmental conditions. Finally, we use a controlled experiment to explore connections between DO loss and short-term changes in labile OM processing within the water column. Such rapid cycling of OM by plankton is likely an important component of ecosystem functioning that warrants further investigation using instantaneous in situ approaches.

Organic Matter
Oxygen
Decomposition

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Presenters/Authors

Matthew Bogard (), University of Lethbridge, matthew.bogard@uleth.ca ;