Distribution characteristics and contribution to total primary production of microphotobenthos in the salt marshes of the Changjiang Estuary

SHANG Xu; GUAN Wei-bing; ZHANG Jing

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SHANG Xu, GUAN Wei-bing, ZHANG Jing. Distribution characteristics and contribution to total primary production of microphotobenthos in the salt marshes of the Changjiang Estuary[J]. Haiyang Xuebao, 2009, 31(5): 40-47.

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Distribution characteristics and contribution to total primary production of microphotobenthos in the salt marshes of the Changjiang Estuary

1.
School of Environmental Science and Public Health, Wenzhou Medical College, Wenzhou China, 325035 China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
2.
College of Marine Science and Technology, Shanghai Fisheries University, Shanghai 200090, China
3.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2008-09-08
Rev Recd Date: 2009-07-20

Abstract

Abstract

The observation of vertical and horizontal distribution of microphytobenthos (MPB) living on tidal flats, and the estimate of the contribution of the dominant primary producers to total primary production have been carried out in the Jiuduansha salt marshes of the Changjiang Estuary in June (summer) and December (winter) of 2006.MPB concentrate on the surface of the sediments under illumination, and its biomass decrease rapidly with depth. Significant variations of chlorophyll a concentrations in the surface sediments are found between tidal flats covered by different vegetations, following the sequence of bare flat > Scirpus mariqueter region > Spartina alterniflora region ≈ Phragmetis australis region. The biomass and production of MPB are much higher than phytoplankton in the overlaying water column, indicating MPB dominate the algal production in these salt marshes. Although the biomass of MPB are much lower than vascular plants, and only account for 0.41% of total biomass of primary producers in Jiuduansha, MPB contribute 16.53% of total primary production to the ecosystem here.Considerable production of MPB makes this nutritious and digestible producer may play an important role in maintaining this salt marsh ecosystem.
- Changjiang Estuary,
- microphytobenthos,
- salt marsh,
- primary production,
- Jiuduansha

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References(38)

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