The preliminary study on size-fractionated biomass of phytoplankton in the central Bohai Sea, the Bohai Straits and its adjacent area Ⅰ. The distribution of phytoplankton size-fractionated biomass

SUN Jun; LIU Dong-yan; ZHANG Chen; ZHONG Hua

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Article Navigation > Haiyang Xuebao > 2003 > 25(5): 103-112

SUN Jun, LIU Dong-yan, ZHANG Chen, ZHONG Hua. The preliminary study on size-fractionated biomass of phytoplankton in the central Bohai Sea, the Bohai Straits and its adjacent area Ⅰ. The distribution of phytoplankton size-fractionated biomass[J]. Haiyang Xuebao, 2003, 25(5): 103-112.

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The preliminary study on size-fractionated biomass of phytoplankton in the central Bohai Sea, the Bohai Straits and its adjacent area Ⅰ. The distribution of phytoplankton size-fractionated biomass

Marine Life Science College, Ocean University of China, Qingdao 266003, China

Received Date: 2001-12-30
Rev Recd Date: 2002-04-12

Abstract

Abstract

Based on the two cruises of Sino-Germany cooperative ecosystem surveys which were carried out in the Bohai Sea(37°～41°N,117.5°～122.5°E)in September 1998 and April 1999,and a mont hly monitoring investigation at the Penglai and Changdao Island,the distribution and variations of phytoplankton size-fractionated biomass were studied.The size-fractionated chlorophyll a was measured.Phytoplankton was classified with four size fractions as follows:netphytoplankton,>76μm(the standard mesh size of phytoplankton net used in China);small netphy-toplankton,20～76μm;nanophytoplankton,2～20μm;picophytoplankton,0.2～2.0μm.The percentage of chlorophyll a concentrations of the four size fraction in the survey area are(31.11±11.46)%,(18.95±9.76)%,(33.06±10.71)% and (16.88±8.52)% (n=239) respectively in the autumn of 1998,and (13.34±7.48)%,(16.87±5.57)%,(52.95±13.51)% and (16.84±13.26)% (n=259) respectively in the spring of 1999.The netphytoplankton and small netphytoplankton can be combined into microphytoplankton. This result shows that the nanophytoplankton is the most important primary producer in spring and microphyto-plankton is the most important one in autumn in the Bohai Sea.The smallest picophytoplankton cannot be neglected and took a percentage of 17% compared with the other phytoplankton size components.The vertical profile patterns of size-fractionated chlorophyll a concentration of Transects 1 and 2 in the survey area show that microphytoplankton usually occupies in the upper water layer.The annual variation of size-fractionated chlorophyll a concentrations in the Bohai Straits show that:high values of chlorophyll a concentrations of netphytoplankton appear in April and July, the maximum is in April;high values of chlorophyll a concentrations of small netphytoplankton appear in June and November,the maximum is in June;similar high values of chlorophyll a concentrations of nanophytoplankton appear in April and November;and high values of chlorophyll a concentrations of picophytoplankton appear in September. The chlorophyll a contribution to total of the various size of phytoplankton in the survey area shows that microphyto-plankton is relatively important primary producer compared with the other regions.
- the Bohai Sea,
- phytoplankton,
- size fraction,
- chlorophylla,
- annual variation

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References(23)

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