Diatom distribution in surface sediments from Chinese inshore waters and the relationship to modern environmental variables  

作　　者：陈淳 赵广涛 陈敏 蓝东兆 兰彬斌 

机构地区：[1]Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Ocean University of China [2]College of Marine Geosciences,Ocean University of China [3]Geology Laboratory of Marine and Coastal Environment, Third Institute of Oceanography, State Oceanic Administration

出　　处：《Chinese Journal of Oceanology and Limnology》2014年第4期828-844,共17页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.41306083);the Special Fund for Basic Work of Science and Technology from the Ministry of Science and Technology of China(No.2009FY210400);the Special Fund of the Third Institute of Oceanography,State Oceanic Administration for Basic Scientific Research Operations(No.HSK 2011028)

摘　　要：Diatoms are widely used to study past and present changes in the marine environment. Unimodal models are appropriate for exploring the relationship between environmental properties in Chinese inshore waters and fossil diatom species derived from modem surface sediments. The best-fit relationships between two multivariate datasets （diatom species and environmental variables） were identified using canonical correspondence analysis （CCA）, which is a constrained ordination technique. The absolute abundance of diatoms in the Chinese inshore waters ranged from 500 to 48 000 valves/g, and the average absolute abundance of all the 29 sites was l l 300 valves/g. 153 species and varieties of diatoms belonging to 42 genera in all were identified in the Chinese inshore waters. There were 28 dominant diatom species in all. According to the absolute abundance of the dominant species and the spatial distribution of the currents from the Chinese inshore waters, 12 diatom assemblages were distinguished from north to south, which reflected the different oceanographic conditions at the regional scale. Of the eight environmental variables considered, the most important environmental variable is winter sea surface salinity （WSS）, which was also the only environmental variable with statistical significance. Therefore, it may be used to establish a transfer functions for the Chinese inshore waters in future paleoclimate studies.Diatoms are widely used to study past and present changes in the marine environment. Unimodal models are appropriate for exploring the relationship between environmental properties in Chinese inshore waters and fossil diatom species derived from modern surface sediments. The best-fit relationships between two multivariate datasets(diatom species and environmental variables) were identified using canonical correspondence analysis(CCA), which is a constrained ordination technique. The absolute abundance of diatoms in the Chinese inshore waters ranged from 500 to 48 000 valves/g, and the average absolute abundance of all the 29 sites was 11 300 valves/g. 153 species and varieties of diatoms belonging to 42 genera in all were identified in the Chinese inshore waters. There were 28 dominant diatom species in all. According to the absolute abundance of the dominant species and the spatial distribution of the currents from the Chinese inshore waters, 12 diatom assemblages were distinguished from north to south, which refl ected the different oceanographic conditions at the regional scale. Of the eight environmental variables considered, the most important environmental variable is winter sea surface salinity(WSS), which was also the only environmental variable with statistical significance. Therefore, it may be used to establish a transfer functions for the Chinese inshore waters in future paleoclimate studies.

关 键 词：inshore waters diatom assemblages environmental variables canonical correspondence analysis （CCA） 

分 类 号：S968.439[农业科学—水产养殖]