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University of Florida students and faculty researching Florida springs suggest alternative explanations for the algal bloom / nitrogen-enrichment hypothesis

Figure 3

Figure 3

Simulation model of spring ecosystem subjected to three disturbances: nutrient enrichment, human disturbance (H) and stress on grazers (S). Simulation results (right) show that a regime shift from SAV dominated ecosystem to algae dominance requires both human disturbance and stress to algae (low DO events). Neither stressor by it self can cause a regime shift.

Credits: Brown, M.T.