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 | GRAZING IMPACTS OF ROTIFER ZOOPLANKTON IN A SEASONALLY CYANOBACTERIA-DOMINATED LAKE | Virtual Platform
GRAZING IMPACTS OF ROTIFER ZOOPLANKTON IN A SEASONALLY CYANOBACTERIA-DOMINATED LAKE
Vancouver Lake in western Washington is one of many freshwater lakes characterized by annual cyanobacteria blooms, which often produce harmful toxins. Zooplankton grazers consume cyanobacteria and other phytoplankton thereby influencing and possibly controlling, harmful bloom dynamics. Previous studies have shown copepod grazing to contribute to bloom formation in many lakes, including Vancouver Lake, but bloom decline to be largely driven by microzooplankton community (i.e., rotifers, ciliates, dinoflagellates) grazing. While the trophic role of some microzooplankton have been investigated, little is known about the influence of rotifer grazing on cyanobacteria. Therefore, experiments with field-collected rotifers grazing upon a natural assemblage of phytoplankton from Vancouver Lake were performed from June through October 2019, capturing the conditions at each stage of a large cyanobacteria bloom. Preliminary results show that rotifers had a small but significant grazing impact on cyanobacteria and other phytoplankton, especially after the peak of the bloom. Additionally, we found the entire microzooplankton community had a large impact on phytoplankton biomass both before and after the bloom peak. These findings suggest that non-rotifer microzooplankton (i.e., ciliates or dinoflagellates) may be mostly responsible for suppressing cyanobacteria blooms.
- Food webs
- Species interactions
- Ecological dynamics
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Presenters/Authors
Kathryn Sweeney
(), Washington State University, kathryn.sweeney@wsu.edu;
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Gretchen Rollwagen-Bollens
(), Washington State University, rollboll@wsu.edu;
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Stephanie Hampton
(), Washington State University, s.hampton@wsu.edu;
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