Distribution of diatoms and silicofl agellates in surface sediments of the Yellow Sea and off shore from the Changjiang River, China -- Journal of Oceanology and Limnology,2016,34(1):44-58

	Cite this paper:
	WANG Yanna, LIU Dongyan, DI Baoping, SHI Yajun, WANG Yujue. Distribution of diatoms and silicofl agellates in surface sediments of the Yellow Sea and off shore from the Changjiang River, China[J]. Journal of Oceanology and Limnology, 2016, 34(1): 44-58

Distribution of diatoms and silicofl agellates in surface sediments of the Yellow Sea and off shore from the Changjiang River, China

WANG Yanna^1,2, LIU Dongyan¹, DI Baoping¹, SHI Yajun¹, WANG Yujue¹

1 Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Abstract:

The spatial distribution of siliceous microfossils (diatoms and silicofl agellates) in the surface sediments was mapped at 113 sites in the Yellow Sea and sea areas adjacent to the Changjiang (Yangtze) River, China. In total, 267 diatom taxa and two silicofl agellate species were identifi ed from the sediments. The spatial variations in abundance and diversity were classifi ed into three distinct geographic patterns using Q mode clustering: a south-north geographic pattern, a coastal-off shore pattern and a unique pattern in the Changjiang River mouth. The south-north geographic pattern was related to the spatial variations in sea temperature. Coscinodiscus oculatus, a warm-water species, indicated these variations by a gradual decrease in abundance from the south to the north. The coastal-off shore pattern was in response to the spatial variations in salinity. Cyclotella stylorum, Actinocyclus ehrenbergii and Dictyocha messanensis, the dominant brackish species in coastal waters, signifi cantly decreased at the isobaths of approximately 30 m, where the salinity was higher than 31. Paralia sulcata and Podosira stelliger indicated the impact of the Yellow Sea Warm Current in the central Yellow Sea. The unique pattern in the Changjiang River mouth showed the highest species diversity but lower abundance, apparently because: freshwater input can signifi cantly increase the proportion of brackish species; nutrients can supply the growth of phytoplankton; and high sedimentation rates can dilute the microfossil abundance in the sediments. Our results show that an integration of environmental factors (e.g., nutrient levels, sedimentation rate, sea temperature, salinity and water depth) determined the spatial characteristics of the siliceous microfossils in the surface sediments.

Key words: siliceous microfossil|Yellow Sea|Changjiang (Yangtze) River|biogeography|sedimentary environment

Received: 2014-09-25 Revised: 2014-10-21

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