Biotransformation and assimilation of dietary lipids by Calanus feeding on a dinoflagellate

Harvey, H. Rodger; Eglinton, G.; Ohara, Susumu; Corner, E. D. S.

doi:10.1016/0016-7037(87)90376-0

Cited by 171 publications

(105 citation statements)

References 27 publications

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“…The above findings demonstrate that D. galeata lacks the enzymatic ability to convert 8 sterols to cholesterol. Notwithstanding our findings, the conversion of 8 sterols to cholesterol was hypothesized by Harvey et al (1987) in the marine copepod Calanus. This suggests taxon specific differences in the structural requirements of dietary sterols for crustaceans.…”

Section: Discussionsupporting

confidence: 59%

“…We are aware of only one example of the oxidation of a 0 sterol to a 5 sterol in arthropods: the firebrat, Thermobia domestica, is capable of synthesizing cholesterol from dihydrocholesterol (Svoboda and Thompson, 1985). Harvey et al (1987) documented that ring-saturated stanols are poorly assimilated and that they pass unaltered through the gut of the marine copepod Calanus. In this study, we found significant amounts of the supplemented dihydrocholesterol in daphnid tissues, which indicates the assimilation of this stanol.…”

Section: Discussionmentioning

confidence: 99%

“…These phytosterols are often characterized by additional substituents or by the position and/or number of double bonds in the side chain or in the sterol nucleus (Piironen et al, 2000). The crustaceans examined to date are capable of converting dietary sterols to cholesterol (Teshima, 1971;Teshima and Kanazawa, 1971b;Ikekawa, 1985;Harvey et al, 1987), but not all sterols are suitable precursors for the synthesis of cholesterol (Teshima et al, 1983).…”

Section: Introductionmentioning

confidence: 99%

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Impact of 10 Dietary Sterols on Growth and Reproduction of Daphnia galeata

Martin‐Creuzburg

Elert

2004

J Chem Ecol

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Abstract-In crustaceans, cholesterol is an essential nutrient, which they must directly obtain from their food or by bioconversion from other dietary sterols. Eukaryotic phytoplankton contain a great variety of sterols that differ from cholesterol in having additional substituents or different positions and/or number of double bonds in the side chain or in the sterol nucleus. In this study, we investigated to what extent these structural features affect the growth and reproduction of Daphnia galeata in standardized growth experiments with the cyanobacterium Synechococcus elongatus supplemented with single sterols as food source. The results indicated that 5 (sitosterol, stigmasterol, desmosterol) and 5,7 (7-dehydrocholesterol, ergosterol) sterols meet the nutritional requirements of the daphnids, while the 7 sterol lathosterol supports somatic growth and reproduction to a significantly lower extent than cholesterol. Dihydrocholesterol ( 0 ) and lanosterol ( 8 ) did not improve the growth of D. galeata, and growth was adversely affected by the 4 sterol allocholesterol. Sterols seem to differ in their allocation to somatic growth and reproduction. Thus, structural differences of dietary sterols have pronounced effects on life-history traits of D. galeata.

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Section: Discussionsupporting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of 10 Dietary Sterols on Growth and Reproduction of Daphnia galeata

Martin‐Creuzburg

Elert

2004

J Chem Ecol

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“…Both macrozooplankton and macrobenthos remove the phytol chain of chl a during grazing (Prahl et al 1984;Harvey et al 1987), resulting in the creation of phaeophorbide a degradation products (Leavitt 1993). Conversely, the microzooplankton or the bacteria cannot eYciently remove the phytol chain of chl a, resulting in the creation of phaeophytin a instead of phaeophorbide a (Verity and Vernet 1992;Leavitt 1993).…”

Section: Discussionmentioning

confidence: 99%

A multiple biomarker approach to tracking the fate of an ice algal bloom to the sea floor

2010

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“…Prahl et al (1984Prahl et al ( , 1985 found considerable amounts of 20:1 and 22:1 alcohols in faecal pellets of Calanus helgolandicus fed an unialgal diet of Dunaliella primolecta (green alga), as well as in faecal pellets of diVerent Wsh species fed C. helgolandicus. Similarly, Harvey et al (1987) Kattner et al (2003), it is unlikely that small copepods are able to produce these fatty alcohols de novo. Hence, the origin of these long-chain alcohols remains a matter of conjecture.…”

Section: Oithona Similismentioning

confidence: 99%

Seasonal lipid dynamics of the copepods Pseudocalanus minutus (Calanoida) and Oithona similis (Cyclopoida) in the Arctic Kongsfjorden (Svalbard)

Lischka

Hagen

2006

Mar Biol

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Seasonal lipid dynamics of various developmental stages were investigated in Pseudocalanus minutus and Oithona similis. For P. minutus, the dominance of 16:1(n¡7), 16:4(n¡3) and 20:5(n¡3) fatty acids indicated a diatom-based nutrition in spring, whereas 22:6(n¡3), 16:0, 18:2(n¡6) and 18:1(n¡9) pointed to a Xagellate-based diet during the rest of the year as well as omnivorous/carnivorous low-level feeding during winter. The shorter-chain fatty alcohols 14:0 and 16:0 prevailed, also reXecting biosynthetic processes typical of omnivores or carnivores. Altogether, the lipid signatures characterized P. minutus as an opportunistic feeder. In contrast, O. similis had consistently high amounts of the 18:1(n¡9) fatty acid in all stages and during all seasons pointing to a generally omnivorous/carnivorous/detritivorous diet. Furthermore, the fatty alcohol 20:1(n¡9) reached high percentages especially in adult females and males, and feeding on Calanus faecal pellets is suggested. Fatty alcohols, as wax ester moieties, revealed signiWcant seasonal variations in O. similis and a seasonal trend towards wax ester accumulation in autumn in P. minutus. P. minutus utilized its lipid deposits for development in the copepodite stages III and IV and for gonad maturation in CV and females during the dark season. However, CVs and females depended on the spring phytoplankton bloom for Wnal maturation processes and reproduction. O. similis fueled gonad maturation and egg production for reproduction in June by wax esters, whereas reproduction in August/September cooccurred with the accumulation of new depot lipids. Both species revealed signiWcantly higher wax ester levels in deeper (>50 m) as compared to surface (0-50 m) dwelling individuals related to a descent prior to overwintering.

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Biotransformation and assimilation of dietary lipids by Calanus feeding on a dinoflagellate

Cited by 171 publications

References 27 publications

Impact of 10 Dietary Sterols on Growth and Reproduction of Daphnia galeata

Impact of 10 Dietary Sterols on Growth and Reproduction of Daphnia galeata

A multiple biomarker approach to tracking the fate of an ice algal bloom to the sea floor

Seasonal lipid dynamics of the copepods Pseudocalanus minutus (Calanoida) and Oithona similis (Cyclopoida) in the Arctic Kongsfjorden (Svalbard)

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