2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/27/2021 | 2:00 PM - 3:30 PM | MULTI-PROXY PALEOLIMNOLOGICAL RECORDS PROVIDE EVIDENCE FOR A SHIFT TO A NEW ECOSYSTEM STATE IN THE NORTHERN GREAT PLAINS | Virtual Platform
MULTI-PROXY PALEOLIMNOLOGICAL RECORDS PROVIDE EVIDENCE FOR A SHIFT TO A NEW ECOSYSTEM STATE IN THE NORTHERN GREAT PLAINS
Prairie pothole wetlands provide vital ecosystem services and are biodiversity hotspots. While these ecosystems are hydrologically variable, in recent decades, an ecohydrological shift driven by marked increases in precipitation has occurred. The response of wetland ecosystems to these changes, however, is not well understood. We examined multiproxy sedimentary data (diatoms, invertebrate isotope signatures) collected from two adjacent, but hydrologically contrasting, wetlands to assess long-term ecosystem responses. One site is closed basin, while the other has an outlet limiting water depth. Within both sites, diatom communities responded similarly, with a rapid increase in planktonic taxa in the last half of the 20th Century, although the timing varied between sites. The shift to the new wetter ecosystem state was recorded in chironomid-derived oxygen and hydrogen isotopic signatures, beginning in 1993. At the same time, Daphnia ephippia carbon stable isotope values decreased, suggested a shift to dependence on methanotroph-derived C and increased methane production in these wetlands. Our paleolimological records confirm that the recent ecohydrological shift is unprecedented (within the past 200 years) and suggests this shift has altered the ecosystem functioning and dynamics of Prairie Pothole Region wetlands.
- Biogeochemistry
- Ecohydrology
- Climate variability
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Presenters/Authors
Kui Hu
(), Environmental and Conservation Sciences Program and Department of Biological Sciences, North Dakota State University, kuihu27@gmail.com;
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David Mushet
(), U.S. Geological Survey, Northern Prairie Wildlife Research Center, dmushet@usgs.gov;
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Jon Sweetman
(), Environmental and Conservation Sciences Program and Department of Biological Sciences, North Dakota State University, sweetman.jon@ndsu.edu;
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