OCCURRENCE OF AN ISOPRENOID C 25 DIUNASATURATED ALKENE AND HIGH NEUTRAL LIPID CONTENT IN ANTRACTIC SEA‐ICE DIATOM COMMUNITIES 1

ABSTRACT The lipid and hydrocarbon composition of natural populations of diatom communities collected during the austral spring bloom of 1985 in the sea‐ice at McMurdo Sound, Antartica was analyzed by TLC‐FID, GC and GC‐MS. Sea‐ice diatom communities were dominated by Amphiprora sp., Nitzschia stell...

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Bibliographic Details
Published in:Journal of Phycology
Main Authors: Nichols, Peter D., Palmisano, Anna C., Volkman, John K., Smith, Glen A., White, David C.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 1988
Subjects:
Plant Science
Aquatic Science
antartic*
McMurdo Sound
Sea ice
Online Access:http://dx.doi.org/10.1111/j.1529-8817.1988.tb04459.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1529-8817.1988.tb04459.x
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1529-8817.1988.tb04459.x
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Summary:ABSTRACT The lipid and hydrocarbon composition of natural populations of diatom communities collected during the austral spring bloom of 1985 in the sea‐ice at McMurdo Sound, Antartica was analyzed by TLC‐FID, GC and GC‐MS. Sea‐ice diatom communities were dominated by Amphiprora sp., Nitzschia stellata Manguin and Berkeleya sp. at Cape Armitage; N. stellata, Amphiprora, Pleurosigma, N. kerguelensis (O'Meara) Hasle and some small centric diatoms adjacent to the Erebus Ice Tongue; and Porosira pseudodenticulata (Hustedt) Jouse at Wohlschlag Bay. Lipid distributions of the sea ice diatom communities from the Cape Armitage and Ereus sites were characterized by high concentrations of tracylaglecycerol (triacylglycerolplar lipid = 1.0 to 1.5). The hydrocarbon n‐C 21:6 , common in temperate diatoms, and an isoprenoid C 25 diunsaturated alkene were the dominant hydrocarons detected at these two sites. Hydrogenation of the C 25 diene produced the known alkane 2, 6, 10, 14‐tetramethyl‐7‐ (3‐methylpentyl)‐pentadecane. The C 25 diene is one of several structurally related hydrocarbons reported in many estuarine, coastal and ocean ic sediments. We propose that certain species of diatoms are a likely source of these alkenes in sediments. The first reported biological occurrence of the C 25 diene in the green seaweed Enteromorpha prolifera may have been due to the presence of epiphytic microalgae in the field sample analysed.

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