Vitamin C in marine copepods

Poulet, S. A.; Hapette, A. M.; Cole, Richard B.; Tabet, J. C.

doi:10.4319/lo.1989.34.7.1325

Cited by 21 publications

(8 citation statements)

References 11 publications

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“…Though the nutritional factors that influence larval fish recruitment are complex (Buckley et al, 1985), the importance of vitamin C has not yet been evaluated. Demonstrated variability of ascorbate in zooplankton in relation to feeding status (Poulet et al, 1989;Hapette & Poulet, 1990) suggests that larval fish food may differ several fold in the amount of vitamin C ingested. This finding opens an entirely new question of ecological significance for ascorbate transfer in the aquatic food chains.…”

Section: Discussionmentioning

confidence: 99%

Ascorbate concentration in fish ontogeny

Dąbrowski

1992

Journal of Fish Biology

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The ontogenetic trend of ascorbate has been quantified in three freshwater fishes: roach (Rurilus rufilus), whitefish (Coregonus lavarefus) and Arctic charr (Salvelinus ulpinus). Total ascorbate (reduced and oxidized) declined from 150 to 5 pg g-' as newly hatched larvae grew to become several-months-old juveniles. Declining total ascorbate with increasing size of metamorphosing fish could not be reversed by feeding on brine shrimp, Arfemiu salina nauplii, zooplanktonic food containing > 74 pg g I total ascorbate. The proportion of reduced ascorbate in total ascorbate increases with fish size/age. The physiological mechanism of the changes in transferable ascorbate forms remains unknown, but high dehydroascorbate concentrations suggest high vulnerability of larval fish to oxidation stress. This is the first report on quantity ofvitamin C retained inactivelyfeeding larval and juvenile fish. The efficiency of ascorbate transfer from zooplankters to larval fish amounted to 5-20%. The ecological significance of larval fish feeding on various zooplankters and/or phytoplankton may reflect a trend toward maximum transfer of this vitamin in freshwater food webs.

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Section: Discussionmentioning

confidence: 99%

Ascorbate concentration in fish ontogeny

Dąbrowski

1992

Journal of Fish Biology

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“…At the end of the exponential phase of growth, each culture was harvested and triplicate samples of known volume (20-300 ml) were filtered on pre-ashed (45O"C, 8 h) GF/F filters and stored at -30°C or in liquid nitrogen (-172°C) for vitamin analysis. For each culture, samples were analyzed for Chl a (Lorenzen 1966), particulate organic C and N (with a Carlo Erba 1106 instrument standardized with cystine), total proteins (Bradford 1976), free amino acids (Roy and Poulet 1990), vitamin C (ascorbic and dehydroascorbic acids; Hapette and Poulet 1990;Poulet et al 1989), and fatty acids (Kattner and Fricke 1986).…”

Section: Methodsmentioning

confidence: 99%

Egg viability in the copepod Temora stylifera

Ianora

Poulet

1993

Limnology & Oceanography

133

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Estimates of production rate and viability of eggs are reported for Remora styIzj2ra collected in the Bay of Naples (Italy). Complementary observations on rates of fecal pellet and spcrmatophore production and female longevity were also conducted during the incubations. In situ egg viability was highly variable during the 2 yr of observation, with mean monthly values of ~80% of total egg production. Under experimental food-saturated conditions, the nature and hatching success of eggs were modified depending on type of food. With a dinoflagellate diet (Prorocentrum minimum), the responses of copepods were characterized by maximum production of viable eggs, high female longevity in the presence or absence of males, and low rates of fecal pellet production. The opposite was true with a diatom diet (Thalassiosira rot&z), except fecal pellets were produced at a higher rate, showing indirectly that this algae was neither properly assimilated nor transformed into production. Total and mean daily egg production were more or less the same with the two diets, indicating that under poorer food conditions copepods can maximize total egg production but not viability.

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“…This question was addressed recently for copepods by Poulet et al (1989). Intraspecific variations reported for this group were of the same order of magnitude as the interspecific variations detected among taxa (Table 1).…”

Section: Discussionmentioning

confidence: 52%

“…Clarke et al 1988). Vitamin C found in fecal pellets (Table 3) is more likely an excretory pathway when the amount supplied by food exceeds copepod needs, as mentioned by Tolbert (1979) Poulet et al 1989, and results therein). Biochemical aspects, such as biosynthesis ability, metabolism pathways and requirements have been investigated in the past for non-planktonic organisms (e.g.…”

Section: Discussionmentioning

confidence: 78%

“…In crustaceans and fishes, the ability to synthesize vitamin C is either absent or weak , Dabrowski et al 1988. Recent application of high-performance liquid chromatography (HPLC; Poulet et al 1989, Hapette & Poulet 1990) to the measurement of vitamin C in zooplankton should allow a reexamination of these questions, which have remained unanswered since Fisher's (1960) review.…”

Section: Introductionmentioning

confidence: 99%

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Variation of vitamin C in some common species of marine plankton

Hapette¹,

Poulet²

1990

Mar. Ecol. Prog. Ser.

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Occurrence of vitamin C, observed in 26 species of the major zooplankton taxa, confirms the ubiquity of this essential micronutrient in eukaryotes. Short-and long-term variations of vitamin C in copepods reflected the dependence of vitamin incorporation upon phytoplankton. The link existing between the source of vitamin C, or its precursor, and the rank of the organisms in the marine foodchain is illustrated by the significant difference found between carnivorous and omnivorous/herbivorous species. Copepods and their fecal pellets are substantial carriers of vitamin C, constituting a potential pathway from phytoplankton to consumers in higher trophic levels and probably unable to synthesize this molecule. Information about properties and functions of vitamin C, known for plants and vertebrates, is scant in zooplankton, although it could be relevant to plankton ecology involving feeding, reproduction and growth.

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Vitamin C in marine copepods

Cited by 21 publications

References 11 publications

Ascorbate concentration in fish ontogeny

Ascorbate concentration in fish ontogeny

Egg viability in the copepod Temora stylifera

Variation of vitamin C in some common species of marine plankton

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