期刊
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
卷 78, 期 -, 页码 70-78出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr.2013.04.007
关键词
CHEMTAX; HPLC pigments; Community structure; Southern Ocean; Diatoms; Phaeocystis antarctica
类别
资金
- National Research Foundation (NRF)
- CSIR Parliamentary Grant
- European Commission 7th framework program through the Green Seas Collaborative Project, FP7-ENV [265294]
A chemotaxonomic investigation of surface phytoplankton was undertaken on a research cruise to the Atlantic sector of the Southern Ocean during late austral summer 2009. Based on pigment signatures, several distinct regions emerged that were delineated by physical features. CHEMTAX analysis of high performance liquid chromatography (HPLC) pigment data indicated that diatoms generally dominated communities south of the Antarctic Polar Front (APF), particularly in regions of elevated biomass where chlorophyll-a (chl-a) was > 1.5 mu g l(-1) and diatoms comprised > 80% of biomass. Pigment signatures representative of haptophytes-8, indicative of Phaeocystis antarctica, were dominant near the ice shelf. Chl-a concentrations were 0.2-0.6 mu g l(-1) between the APF and the Subtropical Front (STF) and outputs suggested that chlorophytes, haptophytes-8 and haptophyte-6, in the form of coccolithophores, were the major constituents. Very low chl-a levels ( < 0.2 mu g l(-1) were observed north of the STF and the prokaryotes Synechococcus spp. and Prochlorococcus spp. were the dominant groups in these oligotrophic waters. (c) 2013 Elsevier Ltd. All rights reserved.
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