Diatom distribution as an environmental indicator in surface sediments of the West Philippine Basin

• Published in: Chinese journal of oceanology and limnology Vol. 35; no. 2; pp. 431 - 443
• Main Author: 沈林南 陈敏 兰彬斌 戚洪帅 张爱梅 蓝东兆 方琦
• Format: Journal Article
• Language: English
• Published: Heidelberg Science Press 01.03.2017; Springer Nature B.V
• Subjects: Abundance; Azpeitia; Bacillariophyceae; basins; Calcareous ooze; Diatomaceous earth; Diatoms; Distribution; Distribution patterns; Dominant species; Earth and Environmental Science; Earth Sciences; Environmental indicators; Ethmodiscus; Ethmodiscus rex; Geographical distribution; Geology; Hemidiscus; Hemidiscus cuneiformis; Marine; Marine microorganisms; Ocean currents; Oceanography; Oozes; Palaeo studies; Plankton; Primary production; primary productivity; principal component analysis; Principal components analysis; Quaternary; Relative abundance; Rhizosolenia; Rhizosolenia bergonii; Roperia; Sediment; Sedimentation & deposition; Sediments; Spatial distribution; ventricosus; 主成分分析; 海盆; 特征; 硅藻丰度; 硅藻组合; 空间分布; 菲律宾; 表层沉积物; AS, Atlantic, North Equatorial Current; INW, Donghai Sea, Kuroshio Current; ISEW, Philippines; Africa; West Philippine Basin (WPB); diatoms; surface sediments; environmental factors; principal component analysis (PCA)
• ISSN: 0254-4059; 2096-5508; 1993-5005; 2523-3521
• DOI: 10.1007/s00343-016-5306-8

The distribution of diatoms from surface sediments of the West Philippine Basin was analyzed, with 68 species and varieties of diatoms from 26 genera identified. Diatom abundance varied spatially, with the absolute abundance of diatoms ranging from 0 to 3.4× 104 frustules/g. The seven tropical pelagic diatoms were Alveus marinus, Azpeitia africana, Azpeitia nodulifera, Hemidiscus cuneiformis, Hernidiscus cuneiformis var. ventricosus, Roperia tesselata and Rhizosolenia bergonii. The relative abundance of these species was greater than 20%, and their distribution pattern in the sediments was overlaid by the flow of the Kuroshio Current. Ethmodiscus rex was present at 159 stations, formed the most abundant and dominant species in the diatomaceous ooze, and thus referred to as Ethmodiscus ooze. Ethmodiscus rex was also a major contributor to primary production in the region. A principal component analysis was employed to explain the relationship between samples and variations in diatom species from the WPB. Four diatom assemblages were distinguished, representing different oceanographic conditions; their spatial distributions were closely related with the North Equatorial Current and Kuroshio Current patterns in the region. These diatom assemblages can therefore be useful in deciphering late Quaternary palaeoceanographic reconstructions of the West Philippine Basin.