A preliminary investigation of the lipids of abyssal holothurians from the north-east Atlantic Ocean

Michael L. Ginger, Vera L.C.S. Santos, George A. Wolff

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The dominant lipids of seven species of abyssal holothurians (Oneirophanta mutabilis, Pseudostichopus villosus, Psychropotes longicauda, Deima validium, Parariza prouhoi, Amperima rosea and Molpadia blakei) have been examined in detail. Fatty acid compositions are qualitatively similar to those of shallow-water holothurians, but relatively higher amounts of unsaturated compounds in the deep sea animals are ascribed to an adaptation of the latter to maintain membrane fluidity at high pressure and low temperature. The sterol distributions of abyssal holothurians are complex, with mixtures of C26-C30 sterols being present in all of the animals. These are most likely to be dietary in origin; the holothurians substitute Δ5 with Δ7 unsaturation, via Δ5,7 or Δ0 intermediates. 14α-methylcholest-9(11)-enol, which is a common product of de novo biosynthesis in shallow-water holothurians is absent in all of the deep-water species. Furthermore, cholest-7-enol, the dominant product of de novo biosynthesis in shallow water animals, is a relatively minor component in all of the species, except A. rosea. This holothurian is also the only one that appears to assimilate 4α-methylsterols directly and contains high amounts of steryl sulphates. There are significant interspecies differences in the free sterol distributions which may reflect their different feeding strategies or niches.

Original languageEnglish
Pages (from-to)139-146
Number of pages8
JournalJournal of the Marine Biological Association of the United Kingdom
Volume80
Issue number1
DOIs
Publication statusPublished - 1 Feb 2000
Externally publishedYes

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sterol
Atlantic Ocean
shallow water
lipid
sterols
animal
ocean
lipids
Pseudostichopus
water
biosynthesis
animals
feeding methods
membrane fluidity
deep sea
niche
fatty acid
deep water
sulfate
membrane

Cite this

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abstract = "The dominant lipids of seven species of abyssal holothurians (Oneirophanta mutabilis, Pseudostichopus villosus, Psychropotes longicauda, Deima validium, Parariza prouhoi, Amperima rosea and Molpadia blakei) have been examined in detail. Fatty acid compositions are qualitatively similar to those of shallow-water holothurians, but relatively higher amounts of unsaturated compounds in the deep sea animals are ascribed to an adaptation of the latter to maintain membrane fluidity at high pressure and low temperature. The sterol distributions of abyssal holothurians are complex, with mixtures of C26-C30 sterols being present in all of the animals. These are most likely to be dietary in origin; the holothurians substitute Δ5 with Δ7 unsaturation, via Δ5,7 or Δ0 intermediates. 14α-methylcholest-9(11)-enol, which is a common product of de novo biosynthesis in shallow-water holothurians is absent in all of the deep-water species. Furthermore, cholest-7-enol, the dominant product of de novo biosynthesis in shallow water animals, is a relatively minor component in all of the species, except A. rosea. This holothurian is also the only one that appears to assimilate 4α-methylsterols directly and contains high amounts of steryl sulphates. There are significant interspecies differences in the free sterol distributions which may reflect their different feeding strategies or niches.",
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A preliminary investigation of the lipids of abyssal holothurians from the north-east Atlantic Ocean. / Ginger, Michael L.; Santos, Vera L.C.S.; Wolff, George A.

In: Journal of the Marine Biological Association of the United Kingdom, Vol. 80, No. 1, 01.02.2000, p. 139-146.

Research output: Contribution to journalArticle

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