Use of lipids to study the trophic ecology of deep-sea xenophyophores
| العنوان: | Use of lipids to study the trophic ecology of deep-sea xenophyophores |
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| المؤلفون: | L Mejanelle, J Laureillard, Myriam Sibuet |
| المصدر: | Marine Ecology Progress Series (0171-8630) (Inter-research), 2004, Vol. 270, P. 129-140 |
| بيانات النشر: | Inter-Research Science Center, 2004. |
| سنة النشر: | 2004 |
| مصطلحات موضوعية: | 0106 biological sciences, Molecular composition, 010504 meteorology & atmospheric sciences, Ecology, 010604 marine biology & hydrobiology, Lipid composition, Sediment, northeastern tropical Atlantic, Aquatic Science, Biology, 01 natural sciences, Deep sea, lipids, Abyssal zone, nutrition, deep sea, Megafauna, 14. Life underwater, Particle trapping, xenophyophores, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences, Trophic level |
| الوصف: | Xenophyophores, widespread giant deep-sea protists, dominate the megafaunal organ- isms visible on the seafloor in some areas. Owing to the extreme fragility of their tests (external part), little is known about them, and their diet is largely a matter of speculation. The extensive accumula- tion of fecal pellets (stercomes) within their tests attests to the degree to which xenophyophores feed on particulate matter. During the EUMELI 2 cruise, xenophyophores were recovered intact at the sur- face of box-cores from an abyssal mesotrophic site in the northeastern Atlantic. They were identified as Syringammina corbicula. In our study, we compare the lipid composition of xenophyophores col- lected at the top of cores with sediment from the same mesotrophic environment devoid of these pro- tists. The distribution of lipid classes was obtained by the use of the Iatroscan (TLC-FID) technique, and the molecular composition of several lipid classes containing fatty acids and sterols was investi- gated. Of special interest are the triacylglycerols of xenophyophores, energy storage lipids in ani- mals, resulting in part from fatty acids found in their diet. They contained a higher level of bacterial fatty acids than those in the reference sediment. It would seem that, in addition to particle trapping, xenophyophores also feed on microbes. Our study points to the occurrence of a specialized bacterial flora, probably growing on the stercomes, which might serve as a secondary food source different from the microflora found in the control sediment. |
| وصف الملف: | application/pdf |
| تدمد: | 1616-1599 0171-8630 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d46683fc3ecc521a729ca74728d4bb7Test https://doi.org/10.3354/meps270129Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....7d46683fc3ecc521a729ca74728d4bb7 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 16161599 01718630 |
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