EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/25/2021 | 2:00 PM - 3:30 PM | LONG-TERM WINTER CHLOROPHYLL DYNAMICS ARE ASYNCHRONOUS AMONG REACHES AND LENTIC-LOTIC AREAS OF A LARGE RIVER | Virtual Platform
LONG-TERM WINTER CHLOROPHYLL DYNAMICS ARE ASYNCHRONOUS AMONG REACHES AND LENTIC-LOTIC AREAS OF A LARGE RIVER
Winters are changing rapidly but the implications for aquatic productivity and food webs are not well understood. In addition, the degree to which winter dynamics respond to climate versus ecosystem-level factors is unclear but important for managing potential changes. We used a unique dataset from the Upper Mississippi River System (UMRS) to explore spatiotemporal patterns in chlorophyll (CHL) and associated environmental covariates across 25 years and ~1,900 river km. To assess the role of regional climate vs site-specific drivers of winter CHL, we evaluated whether there were synchronous long-term dynamics from north to south and across lotic-lentic areas and estimated the degree to which they were associated with climate variability, winter severity, discharge, or site-specific environmental variables. CHL increased from north to south and was typically highest in lentic areas. Temporal dynamics differed among river reaches and lotic-lentic areas within the same reach. Inter-annual variation was most responsive to winter temperatures, with CHL consistently higher in years with warmer winters. This indicates that changing winters have the potential to affect aquatic productivity but accounting for the spatial complexity in ecosystem dynamics will be important in understanding and managing ongoing change.
- Climate change
- Biogeochemistry
- Freshwater continuum
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Presenters/Authors
KathiJo Jankowski
(), U.S. Geological Survey, Upper Midwest Environmental Sciences Center, kjankowski@usgs.gov ;
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Jeffrey Houser
(), USGS Upper Midwest Environmental Sciences Center, jhouser@usgs.gov;
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Mark Scheuerell
(), University of Washington , scheuerl@uw.edu;
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Adrianne Smits
(), University of California, Davis, asmits@ucdavis.edu;
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