Diatom assemblages in surface sediments from the South China Sea as environmental indicators
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- 作者：Rui Wu (1) (4)
Yahui Gao (1) (3)
Qi Fang (2)
Changping Chen (1)
Binbin Lan (2)
Lin Sun (1)
Dongzhao Lan (2) - 关键词：surface sediments ; diatom assemblage zones ; environmental factors ; South China Sea (SCS)
- 刊名：Chinese Journal of Oceanology and Limnology
- 出版年：2013
- 出版时间：January 2013
- 年：2013
- 卷：31
- 期：1
- 页码：31-45
- 全文大小：1032KB
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Yahui Gao (1) (3)
Qi Fang (2)
Changping Chen (1)
Binbin Lan (2)
Lin Sun (1)
Dongzhao Lan (2)
1. School of Life Sciences, Xiamen University, Xiamen, 361005, China
4. Hainan Provincial Marine Development Plan and Design Research Institute, Haikou, 570125, China
3. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361005, China
2. Third Institute of Oceanography, SOA, Xiamen, 361005, China - ISSN：1993-5005
文摘
We studied diatom distribution from 62 samples from the uppermost 1 cm of sediment in the South China Sea (SCS), using grabs or box corers in three cruises between 2001-007. Fifty six genera, 256 species and their varieties were identified. Dominating species included Coscinodiscus africanus, Coscinodiscus nodulifer, Cyclotella stylorum, Hemidiscus cuneiformis, Melosira sulcata, Nitzschia marina, Roperia tesselata, Thalassionema nitzschioides, Thalassiosira excentrica, and Thalassiothrix longissima. Most surface sediments in the SCS were rich in diatoms, except for a few coarse samples. Average diatom abundance in the study area was 104 607 valve/g. In terms of the abundance, ecology, and spatial distribution, seven diatom zones (Zones 1-) were recognized. Zone 1 (northern continental shelf) is affected by warm currents, SCS northern branch of the Kuroshio, and northern coastal currents; Zone 2 (northwestern continental shelf) is affected by intense coastal currents; Zone 3 (Xisha Islands sea area) is a bathyal environment with transitional water masses; Zone 4 (sea basin) is a bathyal-to-deep sea with stable and uniform central water masses in a semi-enclosed marginal sea; Zone 5 (Nansha Islands marine area) is a pelagic environment with relatively high surface temperature; Zone 6 (northern Sunda Shelf) is a tropical shelf environment; and Zone 7 (northern Kalimantan Island shelf area) is affected by warm waters from the Indian Ocean and coastal waters. The data indicate that these diatom zones are closely related to topography, hydrodynamics, temperature, nutrients and especially the salinity. Better understanding of the relationship between diatom distribution and the oceanographic factors would help in the reconstruction of the SCS in the past.