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- Title
Mitigating eutrophication and toxic cyanobacterial blooms in large lakes: The evolution of a dual nutrient (N and P) reduction paradigm.
- Authors
Paerl, Hans W.; Havens, Karl E.; Xu, Hai; Zhu, Guangwei; McCarthy, Mark J.; Newell, Silvia E.; Scott, J. Thad; Hall, Nathan S.; Otten, Timothy G.; Qin, Boqiang
- Abstract
Cyanobacterial harmful algal blooms (CyanoHABs) are an increasingly common feature of large, eutrophic lakes. Non-N2-fixing CyanoHABs (e.g., Microcystis) appear to be proliferating relative to N2-fixing CyanoHABs in systems receiving increasing nutrient loads. This shift reflects increasing external nitrogen (N) inputs, and a > 50-year legacy of excessive phosphorus (P) and N loading. Phosphorus is effectively retained in legacy-impacted systems, while N may be retained or lost to the atmosphere in gaseous forms (e.g., N2, NH3, N2O). Biological control on N inputs versus outputs, or the balance between N2 fixation versus denitrification, favors the latter, especially in lakes undergoing accelerating eutrophication, although denitrification removal efficiency is inhibited by increasing external N loads. Phytoplankton in eutrophic lakes have become more responsive to N inputs relative to P, despite sustained increases in N loading. From a nutrient management perspective, this suggests a need to change the freshwater nutrient limitation and input reduction paradigms; a shift from an exclusive focus on P limitation to a dual N and P co-limitation and management strategy. The recent proliferation of toxic non-N2-fixing CyanoHABs, and ever-increasing N and P legacy stores, argues for such a strategy if we are to mitigate eutrophication and CyanoHAB expansion globally.
- Subjects
CYANOBACTERIAL blooms; MICROCYSTIS; EUTROPHICATION; ALGAL blooms; LAKES; DENITRIFICATION; PHYTOPLANKTON
- Publication
Hydrobiologia, 2020, Vol 847, Issue 21, p4359
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-019-04087-y