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Lipid and lipid carbon stable isotope composition of the hydrothrmal vent shrimp Mirocaris fortunata: Evidence for nutritional dependence on photosynthetically fixed carbon

Mirocaris fortunata were sampled from the Lucky Strike hydrothermal vent area (Eiffel Tower Site) on the Mid-Atlantic Ridge during the French DIVA 2 cruise (June 1994). Small adults (17 to 22 mm total length), although morphologically identical, could be divided into 2 categories on the basis of pig...

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Bibliographic Details
Published in:Marine ecology. Progress series (Halstenbek) 1997-03, Vol.157, p.221-231
Main Authors: Pond, D W, Segonzac, M, Bell, M V, Dixon, DR, Fallick, A E, Sargent, J R
Format: Article
Language:English
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Summary:Mirocaris fortunata were sampled from the Lucky Strike hydrothermal vent area (Eiffel Tower Site) on the Mid-Atlantic Ridge during the French DIVA 2 cruise (June 1994). Small adults (17 to 22 mm total length), although morphologically identical, could be divided into 2 categories on the basis of pigmentation, lipid composition and super(13)C/ super(12)C stable isotope ratios of fatty acids. Highly pigmented small adults (8.6 to 9.2 mu g carotenoid /shrimp) contained higher levels of total lipid than similar-sized individuals containing lower levels of pigment (0.9 to 2.9 mu g carotenoid/shrimp). Lipid class analysis indicated that wax esters comprised 62.5% of total lipid in the former group. These pigmented shrimp also contained high proportions of polyunsaturated fatty acids (PUFA), particularly the phototrophic microplanktonic markers 20:5(n-3) and 22:6(n-3) (14.0 and 33.5% respectively). By contrast small adults (22 mm) and adult shrimp (25 to 26 mm) with low levels of carotenoid pigmentation contained lower amounts of total lipid, little or no wax ester and low levels of 20:5(n-3) and 22:6(n-3), but did contain 16:2(n-4) and 18:2(n-4) and the non-methylene interrupted dienes 20:2 Delta 5,13 and 22:2 Delta 7,15.
ISSN:0171-8630
1616-1599