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Cook, K.V. ; Li, C. ; Cai, H. ; Krumholz, L.R. ; Hambright, K.D. ; Paerl, H.W. ; Steffen, M.M. ; Wilson, A.E. ; Burford, M.A. ; Grossart, H.‐P. ; et al ( , Limnology and Oceanography)
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Burford, M.A ; Carey, C.C ; Hamilton, D.P. ; Huisman, J. ; Paerl, H.W ; Wood, S.A ; Wulff, A. ( , Harmful Algae)
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Paerl, H.W. ; Havens, K.E. ; Xu, H. ; Zhu, G. ; McCarthy, M.J. ; Newell, S.E. ; Scott, J.T. ; Hall, N.S. ; Otten, T.G. ; Qin, B. ( , Hydrobiologia)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 denitrificationmore »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 colimitation 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.« less
