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Published on: November 12, 2021
STIMULATING EFFECT OF ANABAENA SP. (CYANOBACTERIA) EXUDATE ON PRYMNESIUM PARVUM (HAPTOPHYTA)(1)
Michael T Neisch1, Daniel L Roelke1, Bryan W Brooks1
1Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, Texas 77843, USA Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, Texas 77843, USA Department of Oceanography, Texas A&M University, College Station, Texas 77843, USADepartment of Environmental Science, Center for Reservoir and Aquatic Systems Research, Baylor University, One Bear Place #97266, Waco, Texas 76798, USADepartment of Biology and Program in Environmental and Earth Sciences, The University of Texas at Arlington, Arlington, Texas 76019, USADepartment of Wildlife and Fisheries Sciences, Texas A&M University, College Station, Texas 77843, USA.
Cyanobacteria filtrate unexpectedly benefited Prymnesium parvum blooms, suggesting complex interactions rather than simple allelopathy. This may involve stimulating bacteria that P. parvum consumes.
Area of Science:
- Aquatic Ecology
- Microbial Ecology
- Phycology
Background:
- Prymnesium parvum blooms are increasing in the south-central US, causing ecological and economic damage.
- Cyanobacteria's allelopathic effects were hypothesized to inhibit P. parvum growth.
Purpose of the Study:
- To investigate the impact of cultured cyanobacteria, Anabaena sp., on P. parvum growth.
- To determine if Anabaena sp. filtrate exhibits allelopathic effects on P. parvum.
Main Methods:
- Daily addition of filtrate from senescent Anabaena sp. cultures to log-phase P. parvum cultures over 6 days.
- Inclusion of various control treatments to isolate effects.
Main Results:
- All treatments showed a reduction in P. parvum biomass.
- Treatments with Anabaena filtrate exhibited less reduction, indicating a beneficial effect.
- Anabaena filtrate likely stimulated heterotrophic bacteria, providing a food source for P. parvum.
Conclusions:
- Anabaena sp. filtrate did not inhibit P. parvum; instead, it potentially promoted its growth via bacterial stimulation.
- Interactions between cyanobacteria and P. parvum are complex, involving both allelopathic and growth-promoting mechanisms.
- Findings challenge the sole reliance on allelopathy to explain P. parvum bloom dynamics.
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