2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 11:45 AM - 12:00 PM | FLOOD-PULSE CONTROLS ON HETEROTOPIC PROCESSES AND FOOD-WEB PRODUCTIVITY IN THE MEKONG RIVER BASIN | 251 AB
FLOOD-PULSE CONTROLS ON HETEROTOPIC PROCESSES AND FOOD-WEB PRODUCTIVITY IN THE MEKONG RIVER BASIN
The magnitude and pathways by which carbon and energy enter food webs is of fundamental ecological importance and relevant to ecological theory describing community interaction, spatial subsidies, and ecosystem function. The Lower Mekong River basin, including Tonle Sap Lake, is a classic flood-pulse ecosystems and one of the largest inland fisheries in the world that provides a critical source of animal protein for much of Southeast Asia. Recent research has shown that fishery productivity is positively related to flood-pulse magnitude and the duration of the low water period between floods. This talk will summarize a series of investigations into mechanisms driving this pattern, including flood-pulse controls on ecosystem metabolism, oxidative and non-oxidative heterotropic processes, and tropic transfers. Floodplain GPP and ER are strongly related to time of inundation as is both methanogensis and methanotrophy. A combination of stable isotope and fatty acid tracers identify distinct carbon transfer pathways originating from strong autotrophic and heterotrophic production regimes. Ultimately, flood-pulse controls on basal resources and food web dynamics leads to large differences among species in key macromolecules critical for human nutrition, with implications for human food security.
- Secondary Production
- Food Webs
- Isotope
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Presenters/Authors
Gordon Holtgrieve
(), University of Washington, gholt@uw.edu;
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Benjamin Miller
(), University of Washington, blm8@uw.edu;
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John Sabo
(), Arizona State University, John.L.Sabo@asu.edu;
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