| Registro completo |
| Provedor de dados: |
5
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| País: |
France
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| Título: |
Fatty acid characteristics in two symbiotic gastropods from a deep hydrothermal vent of the west Pacific
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| Autores: |
Pranal, V
Fiala Medioni, A
Guezennec, Jean
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| Data: |
1996-10
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| Ano: |
1996
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| Palavras-chave: |
Hydrothermal vents
Gastropods
Chemosynthetic bacteria
Biomarkers
Fatty acids
Phospholipids
Neutral lipids
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| Resumo: |
Two deep-sea gastropods, Ifremeria nautilei and Alviniconcha hessleri, collected on a hydrothermal site of the North Fiji Basin (Southwestern Pacific) were analysed for polar and neutral lipids using gas-liquid chromatography/mass spectrometry. A high level of monounsaturated fatty acids (MUFAs) and a low level of omega 3 series polyunsaturated fatty acids (PUFAs) indicated that nutrition of both gastropods was related to a food web based mainly on bacterial supply. From differences in MUFA distribution between the 2 gastropods, it appeared that most of the energy requirements of A. hessleri were supplied by sulfur-oxidizing endobacteria whereas I. nautilei probably had a mixotrophic diet based on endogenous as well as exogenous bacteria. Given the relatively high level of linoleic acid, which represented from 2 to 8% of the phospholipid fatty acids, hydrothermal gastropods did not appear to be depleted in omega 6 PUFAs. It was hypothesized that they obtain linoleic acid from a pathway different to that in heterotrophic marine molluscs. In contrast to omega 6 PUFAs, both hydrothermal gastropods appeared to be depleted in omega 3 PUFAs, indicating the limited importance of photosynthesis-based food supplies. Some non-methylene-interrupted dienes, particularly 20:2 omega 9,15 which represented from 9 to 18% of the phospholipid fatty acids, may be synthesized by deep-sea symbiotic molluscs in order to restore the depleted omega 3 PUFAs considered as essential for animals. Gills of both gastropods had high levels of neutral lipids, mainly MUFAs that may have originated from degradation of endobacterial phospholipids.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00282/39287/43133.pdf
DOI:10.3354/meps142175
http://archimer.ifremer.fr/doc/00282/39287/
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| Editor: |
Inter-research
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| Formato: |
application/pdf
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| Fonte: |
Marine Ecology Progress Series (0171-8630) (Inter-research), 1996-10 , Vol. 142 , N. 1-3 , P. 175-184
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| Direitos: |
Inter-Research 1996
info:eu-repo/semantics/openAccess
restricted use
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