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Controlling harmful cyanobacterial blooms in a hyper-eutrophic lake (Lake Taihu, China): the need for a dual nutrient (N & P) management strategy.
Water Res. 2011 Feb; 45(5):1973-83.WR

Abstract

Harmful cyanobacterial blooms, reflecting advanced eutrophication, are spreading globally and threaten the sustainability of freshwater ecosystems. Increasingly, non-nitrogen (N(2))-fixing cyanobacteria (e.g., Microcystis) dominate such blooms, indicating that both excessive nitrogen (N) and phosphorus (P) loads may be responsible for their proliferation. Traditionally, watershed nutrient management efforts to control these blooms have focused on reducing P inputs. However, N loading has increased dramatically in many watersheds, promoting blooms of non-N(2) fixers, and altering lake nutrient budgets and cycling characteristics. We examined this proliferating water quality problem in Lake Taihu, China's 3rd largest freshwater lake. This shallow, hyper-eutrophic lake has changed from bloom-free to bloom-plagued conditions over the past 3 decades. Toxic Microcystis spp. blooms threaten the use of the lake for drinking water, fisheries and recreational purposes. Nutrient addition bioassays indicated that the lake shifts from P limitation in winter-spring to N limitation in cyanobacteria-dominated summer and fall months. Combined N and P additions led to maximum stimulation of growth. Despite summer N limitation and P availability, non-N(2) fixing blooms prevailed. Nitrogen cycling studies, combined with N input estimates, indicate that Microcystis thrives on both newly supplied and previously-loaded N sources to maintain its dominance. Denitrification did not relieve the lake of excessive N inputs. Results point to the need to reduce both N and P inputs for long-term eutrophication and cyanobacterial bloom control in this hyper-eutrophic system.

Authors+Show Affiliations

University of North Carolina at Chapel Hill, Institute of Marine Sciences, 3431 Arendell Street, Morehead City, NC 28557, USA. hpaerl@email.unc.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

20934736

Citation

Paerl, Hans W., et al. "Controlling Harmful Cyanobacterial Blooms in a Hyper-eutrophic Lake (Lake Taihu, China): the Need for a Dual Nutrient (N & P) Management Strategy." Water Research, vol. 45, no. 5, 2011, pp. 1973-83.
Paerl HW, Xu H, McCarthy MJ, et al. Controlling harmful cyanobacterial blooms in a hyper-eutrophic lake (Lake Taihu, China): the need for a dual nutrient (N & P) management strategy. Water Res. 2011;45(5):1973-83.
Paerl, H. W., Xu, H., McCarthy, M. J., Zhu, G., Qin, B., Li, Y., & Gardner, W. S. (2011). Controlling harmful cyanobacterial blooms in a hyper-eutrophic lake (Lake Taihu, China): the need for a dual nutrient (N & P) management strategy. Water Research, 45(5), 1973-83. https://doi.org/10.1016/j.watres.2010.09.018
Paerl HW, et al. Controlling Harmful Cyanobacterial Blooms in a Hyper-eutrophic Lake (Lake Taihu, China): the Need for a Dual Nutrient (N & P) Management Strategy. Water Res. 2011;45(5):1973-83. PubMed PMID: 20934736.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Controlling harmful cyanobacterial blooms in a hyper-eutrophic lake (Lake Taihu, China): the need for a dual nutrient (N & P) management strategy. AU - Paerl,Hans W, AU - Xu,Hai, AU - McCarthy,Mark J, AU - Zhu,Guangwei, AU - Qin,Boqiang, AU - Li,Yiping, AU - Gardner,Wayne S, Y1 - 2010/09/29/ PY - 2010/02/16/received PY - 2010/08/26/revised PY - 2010/09/14/accepted PY - 2010/10/12/entrez PY - 2010/10/12/pubmed PY - 2011/6/7/medline SP - 1973 EP - 83 JF - Water research JO - Water Res VL - 45 IS - 5 N2 - Harmful cyanobacterial blooms, reflecting advanced eutrophication, are spreading globally and threaten the sustainability of freshwater ecosystems. Increasingly, non-nitrogen (N(2))-fixing cyanobacteria (e.g., Microcystis) dominate such blooms, indicating that both excessive nitrogen (N) and phosphorus (P) loads may be responsible for their proliferation. Traditionally, watershed nutrient management efforts to control these blooms have focused on reducing P inputs. However, N loading has increased dramatically in many watersheds, promoting blooms of non-N(2) fixers, and altering lake nutrient budgets and cycling characteristics. We examined this proliferating water quality problem in Lake Taihu, China's 3rd largest freshwater lake. This shallow, hyper-eutrophic lake has changed from bloom-free to bloom-plagued conditions over the past 3 decades. Toxic Microcystis spp. blooms threaten the use of the lake for drinking water, fisheries and recreational purposes. Nutrient addition bioassays indicated that the lake shifts from P limitation in winter-spring to N limitation in cyanobacteria-dominated summer and fall months. Combined N and P additions led to maximum stimulation of growth. Despite summer N limitation and P availability, non-N(2) fixing blooms prevailed. Nitrogen cycling studies, combined with N input estimates, indicate that Microcystis thrives on both newly supplied and previously-loaded N sources to maintain its dominance. Denitrification did not relieve the lake of excessive N inputs. Results point to the need to reduce both N and P inputs for long-term eutrophication and cyanobacterial bloom control in this hyper-eutrophic system. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/20934736/Controlling_harmful_cyanobacterial_blooms_in_a_hyper_eutrophic_lake__Lake_Taihu_China_:_the_need_for_a_dual_nutrient__N_&_P__management_strategy_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(10)00658-5 DB - PRIME DP - Unbound Medicine ER -