Phytoplankton chemotaxonomy in the Atlantic sector of the Southern Ocean during late summer 2009

• Main Authors: Gibberd, M-J, Kean, E, Barlow, R, Thomalla, Sandy J, Lucas, M
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2013
• Subjects: CHEMTAX; HPLC pigments; Community structure; Southern Ocean; Diatoms; Phaeocystis antarctica; Antarctic; Austral; The Antarctic; Antarc*; Antarctica; Ice Shelf
• Online Access: http://hdl.handle.net/10204/7463; http://ac.els-cdn.com/S0967063713000861/1-s2.0-S0967063713000861-main.pdf?_tid=2e5bd630-ebd0-11e3-ac59-00000aacb35f&acdnat=1401876691_47f13ba4be6529c7a06c5c6ee21a7268

Copyright: 2013 Elsevier. This is an ABSTRACT ONLY. The definitive version is published in Deep-Sea Research Part 1: Oceanographic Research Papers, vol. 78, pp 70-78 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 41.5 mg l(sup-1) and diatoms comprised 480% 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 mg l(sup-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 (o0.2 mg l(sup-1) were observed north of the STF and the prokaryotes Synechococcus spp. and Prochlorococcus spp. were the dominant groups in these oligotrophic waters.