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学科主题: Marine & Freshwater Biology
题名: TN : TP ratio and planktivorous fish do not affect nutrient-chlorophyll relationships in shallow lakes
作者: Wang, Hai-Jun1; Liang, Xiao-Min1; Jiang, Ping-Hong1, 2; Wang, Jian1; Wu, Shi-Kai1, 2; Wang, Hong-Zhu1
通讯作者: Wang, HZ, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
关键词: chlorophyll-a ; phytoplankton ; planktivorous fish ; total nitrogen : total phosphorus ratio ; total phosphorus
刊名: FRESHWATER BIOLOGY
发表日期: 2008-05-01
DOI: 10.1111/1365-2427.2007.01950.x
卷: 53, 期:5, 页:935-944
收录类别: SCI
文章类型: Article
部门归属: [Wang, Hai-Jun; Liang, Xiao-Min; Jiang, Ping-Hong; Wang, Jian; Wu, Shi-Kai; Wang, Hong-Zhu] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China; [Jiang, Ping-Hong; Wu, Shi-Kai] Chinese Acad Sci, Grad Sch, Beijing, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Marine & Freshwater Biology
研究领域[WOS]: Marine & Freshwater Biology
摘要: 1. In previous work, phytoplankton regulation in freshwater lakes has been associated with many factors. Among these, the ratio of total nitrogen to total phosphorus (TN : TP) has been widely proposed as an index to identify whether phytoplankton are N- or P-limited. From another point of view, it has been suggested that planktivorous fish can be used to control phytoplankton. 2. Large-scale investigations of phytoplankton biomass [measured as chlorophyll a, (chl-a)] were carried out in 45 mid-lower Yangtze shallow lakes to test hypotheses concerning nutrient limitation (assessed with TN : TP ratios) and phytoplankton control by planktivorous fish. 3. Regression analyses indicated that TP was the primary regulating factor and TN the second regulating factor for both annual and summer phytoplankton chl-a. In separate nutrient-chl-a regression analyses for lakes of different TN : TP ratios, TP was also superior to TN in predicting chl-a at all particular TN : TP ranges and over the entire TN : TP spectrum. Further analyses found that chl-a : TP was not influenced by TN : TP, while chl-a : TN was positively and highly correlated to TP : TN. 4. Based on these results, and others in the literature, we argue that the TN : TP ratio is inappropriate as an index to identify limiting nutrients. It is almost impossible to specify a 'cut-off' TN : TP ratio to identify a limiting nutrient for a multi-species community because optimal N : P ratios vary greatly among phytoplankton species. 5. Lakes with yields of planktivorous fish (silver and bighead carp, the species native to China) > 100 kg ha(-1) had significantly higher chl-a and lower Secchi depth than those with yields < 100 kg ha(-1). TP-chl-a and TP-Secchi depth relationships are not significantly different between lakes with yields > 100 kg ha(-1) or < 100 kg ha(-1). These results indicate that the fish failed to decrease chl-a yield or enhance Z(SD). Therefore, silver carp and bighead carp are not recommended as a biotic agent for phytoplankton control in lake management if the goal is to control the entire phytoplankton and to enhance water quality.
英文摘要: 1. In previous work, phytoplankton regulation in freshwater lakes has been associated with many factors. Among these, the ratio of total nitrogen to total phosphorus (TN : TP) has been widely proposed as an index to identify whether phytoplankton are N- or P-limited. From another point of view, it has been suggested that planktivorous fish can be used to control phytoplankton.
关键词[WOS]: SILVER CARP ; HYPOPHTHALMICHTHYS-MOLITRIX ; PLANKTON COMMUNITY ; ALGAL BIOMASS ; BIGHEAD CARP ; PHOSPHORUS ; PREDICTION ; NITROGEN ; EUTROPHICATION ; PHYTOPLANKTON
语种: 英语
WOS记录号: WOS:000254808400008
ISSN号: 0046-5070
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/8184
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing, Peoples R China

Recommended Citation:
Wang, Hai-Jun; Liang, Xiao-Min; Jiang, Ping-Hong; Wang, Jian; Wu, Shi-Kai; Wang, Hong-Zhu.TN : TP ratio and planktivorous fish do not affect nutrient-chlorophyll relationships in shallow lakes,FRESHWATER BIOLOGY,2008,53(5):935-944
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