Phytoplankton community structure and its succession in Dianshan Lake

doi:10.3724/SP.J.1003.2011.09044

Abstract

Abstract:

Phytoplankon samples were collected monthly in Dianshan Lake, the largest natural freshwater lake in Shanghai during 2004-2006, to assay the phytoplankton community structure and ascertain the relationship between its succession and the eutrophication for the lake. Two hundred and five species from 84 genera were identified in Dianshan Lake, with Chlorophyta (50%), Bacillariophyta (20%), Cyanophyta (13%) and Euglenophyta (13%) being the main phyla. The monthly similarity index of species was high in winter and spring, while low in summer and autumn. The dominant species were Merismopedia glauca,Phormidium tenus, Microcystis aeruginosa, M. marginata, Lyngbya limnetica, Chroococcus minutus, Melosira granulatavar.angustissima, Cryptomonas erosa, Chlorella vulgaris and Scenedesmus quadricauda. The total phytoplankton abundance was mainly composed of Cyanophyta (36.75%), Chlorophyta (16.78%), Bacillariophyta (16.36%) and Cryptophyta (13.53%). The total phytoplankton biomass was dominantly made up of Bacillariophyta (36.75%), Cyanophyta (16.78%), Chlorophyta (16.36%) and Cryptophyta (13.53%). The seasonal succession of phytoplankton community structure in Dianshan Lake was different from the PEG Model, with Cyanophyta of great abundance occurring at the end of spring, then dominating in summer and the early autumn. In the past five decades, the succession pattern of phytoplankton community in the Dianshan Lake showed a decrease in the proportion of such oligotrophic species as Chrysophyta and Dinophyta and an increase in such eutrophic species as Cyanophyta, Cryptophyta and Chlorophyta. The abundance increased from 10³ ind./L in 1959 to 1.11×10⁷cells/L during 2004-2006. The phytoplankton community structure changed from Bacillariophyta-Chrysophyta type in 1959, Bacillariophyta-Cryptophyta type during 1987-1988 to Cyanophyta-Chlorophyta type during 2004-2006. The changes in the abundance and structure of phytoplankton community and its seasonal succession indicated the evolving eutrophication of Dianshan Lake.

Key words: phytoplankton, dominant phytoplankton species, community structure, community succession, eutrophication, Dianshan Lake

Liqing Wang, Rong Shi, Gaohua Ji, Zhifeng Fan, Jinglei Cheng. Phytoplankton community structure and its succession in Dianshan Lake[J]. Biodiv Sci, 2011, 19(1): 48-56.

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URL: https://www.biodiversity-science.net/EN/10.3724/SP.J.1003.2011.09044

https://www.biodiversity-science.net/EN/Y2011/V19/I1/48

Figures/Tables 10

References 28

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年 Year	1-2月 Jan.- Feb.	2-3月 Feb.- Mar.	3-4月 Mar.- Apr.	4-5月 Apr.- May	5-6月 May- Jun.	6-7月 June- July	7-8月 July- Aug.	8-9月 Aug.- Sep.	9-10月 Sep.- Oct.	10-11月 Oct.- Nov.	11-12月 Nov.- Dec.
2004	39.53	54.35	46.77	63.75	64.63	56.63	65.08	34.29	61.9	58.02	50.00
2005	-	-	55.65	52.89	38.93	29.51	43.86	49.49	57.43	56.19	54.02
2006	57.81	55.36	53.42	33.33	36.92	64.00	54.79	45.33	34.29	30.77	43.18

年 Year	1-2月 Jan.- Feb.	2-3月 Feb.- Mar.	3-4月 Mar.- Apr.	4-5月 Apr.- May	5-6月 May- Jun.	6-7月 June- July	7-8月 July- Aug.	8-9月 Aug.- Sep.	9-10月 Sep.- Oct.	10-11月 Oct.- Nov.	11-12月 Nov.- Dec.
2004	39.53	54.35	46.77	63.75	64.63	56.63	65.08	34.29	61.9	58.02	50.00
2005	-	-	55.65	52.89	38.93	29.51	43.86	49.49	57.43	56.19	54.02
2006	57.81	55.36	53.42	33.33	36.92	64.00	54.79	45.33	34.29	30.77	43.18

优势种 Dominant species	2004	2005	2006
银灰平裂藻 Merismopedia glauca	0.027	0.164	0.319
小席藻 Phormidium tenus	0.027	0.079	0.194
湖泊鞘丝藻 Lyngbya limnetica	-	0.131	0.062
铜绿微囊藻 Microcystis aeruginosa	0.123	-	-
具缘微囊藻 M. marginata	0.123	-	-
微小色球藻 Chroococcus minutus	-	—	0.039
颗粒直链藻最窄变种 Melosira granulatavar. angustissima	-	0.023	0.032
小球藻 Chlorella vulgaris	-	0.020	—
四尾栅藻 Scenedesmus quadricauda	-	0.023	-
啮蚀隐藻 Cryptomonas erosa	-	-	0.042

优势种 Dominant species	2004	2005	2006
银灰平裂藻 Merismopedia glauca	0.027	0.164	0.319
小席藻 Phormidium tenus	0.027	0.079	0.194
湖泊鞘丝藻 Lyngbya limnetica	-	0.131	0.062
铜绿微囊藻 Microcystis aeruginosa	0.123	-	-
具缘微囊藻 M. marginata	0.123	-	-
微小色球藻 Chroococcus minutus	-	—	0.039
颗粒直链藻最窄变种 Melosira granulatavar. angustissima	-	0.023	0.032
小球藻 Chlorella vulgaris	-	0.020	—
四尾栅藻 Scenedesmus quadricauda	-	0.023	-
啮蚀隐藻 Cryptomonas erosa	-	-	0.042

常见属(种) Common genera (species)	2004	2005	2006
色球藻属 Chroococcus	0.32	0.80	3.00
席藻属 Phormidium	4.38	9.71	27.23
平裂藻属 Merismopedia	4.45	20.51	37.90
十字藻属 Crucigenia	0.49	2.12	1.16
多芒藻 Golenkinia radiata	0.21	0.25	0.69
纤维藻属 Ankistrodesmus	0.27	1.19	0.77
卵囊藻属 Oocystis	0.15	1.53	0.70
盘星藻属 Pediastrum	0.19	0.68	0.15
栅藻属 Scenedesmus	1.30	4.11	1.97
衣藻属 Chlamydomonas	1.22	0.87	2.16
啮蚀隐藻 Cryptomonas erosa	1.74	2.04	4.06
颗粒直链藻 Melosira granulate	2.77	4.98	3.84
尖针杆藻 Synedra acus	0.62	1.89	1.07
梅尼小环藻 Cyclotella meneghiniana	0.50	0.61	0.96
扁裸藻属 Phacus	0.08	0.11	0.05
裸藻属 Euglena	0.09	0.22	0.09