2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2021 | 8:30 AM - 10:30 AM | DISTRIBUTION AND ABUNDANCE OF PHYTOPLANKTON IN THE MIDDLE MISSOURI RIVER BASIN | Virtual Platform
DISTRIBUTION AND ABUNDANCE OF PHYTOPLANKTON IN THE MIDDLE MISSOURI RIVER BASIN
Invasive bigheaded carps (Hypophthalmichthys nobilis and H. molitrix), formerly referred to as Asian carps, are generalist consumers that may directly compete with native planktivores by modifying the biomass and community structure of local plankton populations. Much of the Missouri River Basin (MRB) has been colonized by bigheaded carps except for some sites upstream of dispersal barriers like dams. To determine the potential impacts of bigheaded carps on river communities, we collected phytoplankton from 33 sites in the MRB and compared results to an identical survey conducted 70 years ago. Preliminary analysis suggests differences in the phytoplankton community, regardless of the presence of bigheaded carps, in both current phytoplankton density (individuals/ml) and community structure when compared to past data. Consistent with historical data, phytoplankton density in tributaries was several orders of magnitude greater than in the mainstem Missouri River. Historical increasing downstream trends in phytoplankton abundance within MRB tributaries, however, were not observed in recent data. Comparing current phytoplankton data from both above and below impoundments in the MRB to past studies may provide further insight into potential bottom-up effects from bigheaded carp colonization.
- Stream
- Species interactions
- Resource subsidies
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Presenters/Authors
Ryan Dunbeck
(), University of South Dakota, ryan.dunbeck@coyotes.usd.edu;
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Jeff Wesner
(), University of South Dakota, Jeff.Wesner@usd.edu;
ASHA DISCLOSURE:
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