Composition biochimique des cop�podes de l'hyponeuston de M�diterran�e Nord occidentale. Poids sec et analyse �l�mentaire du carbone, de l'hydrog�ne et de l'azote

Champalbert, Gisèle; Kerambrun, P.

doi:10.1007/bf00390604

Cited by 13 publications

(6 citation statements)

References 22 publications

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“…Various authors (e.g. Raymont et al, 1964;Pandian and Schumann, 1967;Champalbert and Kerambrun, 1978) calculated protein content from total nitrogen, multiplying its amount by 6.25. This conversion is based on 2 assumptions: (1) nitrogen always accounts to ca.…”

Section: Interrelation Between Elemental and Biochemical Constituentsmentioning

confidence: 99%

Changes in biomass and chemical composition of spider crab (Hyas araneus) larvae reared in the laboratory

Anger¹,

Laasch²,

Piischel³

et al. 1983

Mar. Ecol. Prog. Ser.

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Larval and early post-larval growth has been investigated in Hyas araneus L. (Majidae) reared in the laboratory. Growth was measured as dry weight (DW), ash-free dry weight (AFDW), carbon (C), nitrogen (N), hydrogen (H), gross biochemical constituents (protein, lipid, carbohydrate, chitin, ash) and energy (calculated separately from carbon and biochemical composition). During larval development, i. e. from freshly hatched zoea-1 to late megalopa, all these cr~teria of b~omass increase by factors ranging between 5 and 14; carbohydrate shows the lowest, chitin the highest Increment. There are indications of loss in organic body weight during the latest period preceding metamorphosis to the crab stage. When no food is offered during this time, megalopae lose significantly more biomass than control larvae. This suggests that food is still required, but feeding activity is reduced to a level below maintenance ingestion rate. Follow~ng metamorphosis, the juvenile crab accumulates biomass at a far higher absolute rate (expressed as pg d-') than all larval stages. This alteration in growth pattern is attributed to lack of further morphological changes. Among the biochemical constituents, protein is most prominent (50 to 68 % AFDW), followed by lipid (I? to 30 %) and chitin (7 to 17 76). Carbohydrates play a minor role contributing only 1 6 to 3.7 % of AFDW. The percentage of protein increases during zoeal development; later it decreases. This pattern is inversely related to changes in ash content, which ranges from 19 to 30 % DW. Lipid (% AFDW) shows a decreasing tendency during larval development. Separate calculations of energy content from C and from biochemical composition yield systematic differences, the former usually being lower than the latter. Only in late megalopae is this pattern Inverted, presumably due to inorganic C in the increasingly calcified cuticle of this stage. Non-linear regression equations are given for conversions of C to protein, lipid, and carbohydrate, N to protein, and H to lipid. The relationship between N and protein suggests that non-protein, non-chitin N may also be important, and calculation of protein by multiplication of total N X 6.25 results in an overestimation of protein.

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Section: Interrelation Between Elemental and Biochemical Constituentsmentioning

confidence: 99%

Changes in biomass and chemical composition of spider crab (Hyas araneus) larvae reared in the laboratory

Anger¹,

Laasch²,

Piischel³

et al. 1983

Mar. Ecol. Prog. Ser.

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“…The highest value for the study area was recorded for the western station (Agami) (8.8%) observed during winter 2000, Beers (1966) observed 9.62% N (dry weight) in copepods and 7.83% N in other crustaceans from samples collected from the Sargasso Sea. Among 4 species of copepods from the NW Mediterranean, Champalbert and Kerambrun (1978) found nitrogen concentrations ranging from 9.3% N and 11.5% N. For Pontella mediterranean Champalbert and Kemambrun (1979) reported an average nitrogen content of 11.4%. Williams and Robins (1982) The nitrop.en content of QBPS zooplankton is highly related to the chlorophyll a biomass off the discharge, showing strong coincident peaks (r = 0.7316, p<0,001).…”

Section: Carbon Contentmentioning

confidence: 96%

“…Using carbon levels, Kerambrun (1978) calculated energy equivalents to range from 4.28 to 5.00 eal/mg DW. Applying his conversion factor for zooplankton, the organism could have an average energy equivalent of 5.9 cal/mg dry weight.…”

Section: Carbon Contentmentioning

confidence: 99%

Chemical Composition of the Zooplankton Community Subjected to Landbased Activities Along Alexandria Coastal Waters

Ahdel-Mosits

El-Din

2001

Egypt. J. of Aquatic Biolo. and Fish.

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T he chemical composition of zooplankton has been studied during I QV^^OOO along the coastal waters of Alexandria from 8 stations representing different areas subjected to different types and quantities of landbased activities. The annual averages of carbon-nitrogen and phosphorus contents during the period of study were 45-3%, 5.84% and 0.42%, respectively. The N:P ratio for zooplankton was 13.9 while that of C:N ratio was. 7.75> i.exemarkably higher than that reported for marine organisms. Organisms collected opposite to sewage discharge were characterized by high chemical components while opposite to industrial discharge, the zooplankton chemical components were minimum. The chemical composition of zooplankton is mostly affected by the variations of available food represented by chlorophyll a concentrations.

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“…In the past few decades, many studies have been carried out on the biomass and chemical composition of marine plankton to understand the reproduction and biogeochemical circulation of elements in the ocean (Omori, 1969;B~mstedt, 1976;Nemoto et al, 1976;Champalbert & Kerambrun, 1978;Finlay &Uhlig, 1981, andSkjoldal, 1989). However, most of this data is derived from natural populations where practical problems arise due to the difficulties in isolating certain species of the net plankton and obtaining relatively large amounts of pure and dry material for analyses.…”

Section: Introductionmentioning

confidence: 99%

Dry weight and chemical composition (CHN) in relation to population density of cultivatedTisbe holothuriae (Copepoda, Harpacticoida)

Qian

Uhlig

1993

Helgolander Meeresunters

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The harpacticoid copepod Tisbe hotothuriae was cultivated at different densities in a running-water system. Dry weight and chemical composition (CHN) of both females and egg-sacs have been determined. Dry weight decreased significantly with increasing density from 3.48 to 1.94 ~g in egg-sacs, and from 10.80 to 6.58 ~g in females. Increasing density in both egg-sacs and females results in decrease of carbon, nitrogen and hydrogen contents, expressed as a percentage of dry weight of egg-sacs and females, respectively. Carbon decreases from 52.56 to 50.57 % (egg-sacs) and 45.80 to 39.95 % (9), nitrogen from 12.63 to 11.94 % and 10.72 to 9.73 % and hydrogen from 9.08 to 7.78 % and 7.47 to 6.17 %. The dry weight and elemental compositions of the egg-sacs varied in accordance with that of the females, however, a higher percentage of elemental content was observed in egg-sacs. The energy equivalents were calculated from the carbon content. This indicates that more energy was transferred from the maternal body into egg-sacs. The ratio of carbon to nitrogen did not show any marked variations; no clear relation appeared between C:N and density, indicating a relatively constant chemical composition in both females and egg-sacs.

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Composition biochimique des cop�podes de l'hyponeuston de M�diterran�e Nord occidentale. Poids sec et analyse �l�mentaire du carbone, de l'hydrog�ne et de l'azote

Cited by 13 publications

References 22 publications

Changes in biomass and chemical composition of spider crab (Hyas araneus) larvae reared in the laboratory

Changes in biomass and chemical composition of spider crab (Hyas araneus) larvae reared in the laboratory

Chemical Composition of the Zooplankton Community Subjected to Landbased Activities Along Alexandria Coastal Waters

Dry weight and chemical composition (CHN) in relation to population density of cultivatedTisbe holothuriae (Copepoda, Harpacticoida)

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