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Updated: Feb 12, 2026
07:04
Determination of the Glycogen Content in Cyanobacteria
Published on: July 17, 2017
13.7K
Top-Down Control of Cyanobacteria: A Theoretical Analysis.
The American Naturalist
|March 27, 2018
Summary
Zooplankton grazing impacts cyanobacteria abundance, with fish predation influencing outcomes. Reduced fish predation can lead to cyanobacteria dominance or elimination, depending on nutrient levels and zooplankton selectivity.
Area of Science:
- Aquatic Ecology
- Limnology
- Theoretical Ecology
Background:
- Zooplankton grazing effects on large colonial cyanobacteria vary.
- Competition dynamics between cyanobacteria and green algae are complex.
Purpose of the Study:
- Analyze a model of competition between Oscillatoria cyanobacteria and green algae.
- Investigate the influence of nutrient concentration and fish predation on this competition.
Main Methods:
- Extensive model analysis.
- Exploration of varying cyanobacterial nutritional value and zooplankton selectivity.
- Simulation of different fish predation pressures.
Main Results:
- High fish predation leads to competitive exclusion and alternative attractors (cyanobacteria-only or algae-only).
- Lower fish predation with selective zooplankton can create a "mixed" attractor with coexistence.
- The mixed attractor can be stationary, oscillatory, or chaotic.
Conclusions:
- Cyanobacterial dominance is sensitive to nutrient levels, cyanobacteria nutritional value, and zooplankton selectivity.
- Model findings align with diverse field and experimental observations.
- Fish predation indirectly regulates cyanobacteria abundance through zooplankton dynamics.
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