The blood sugar of some invertebrates<sup>1</sup>

Hemmingsen, Axel M.

doi:10.1111/j.1748-1716.1924.tb00143.x

Cited by 20 publications

(2 citation statements)

References 3 publications

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“…Our preliminary data also suggest that there is a rise in carbohydrate in our animals with feeding. This agrees with the findings of previous workers, who showed a rise in blood sugar levels with feeding in crayfish and inseccs (Hemmingsen, 1924). There also appears to be a fall in the total carbohydrate content in starving planktonic animals, as has been found in the shore form Carcinus by Kleinholz & Little (1949), and this fall could be associated with activity, suggesting thus that sugars may be metabolized to some extent.…”

Section: Discussionsupporting

confidence: 92%

Carbohydrates in some marine planktonic animals

Raymont

Krishnaswamy

1960

J. Mar. Biol. Ass.

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There have been few analyses of the fat, protein and carbohydrate fractions in zooplankton, and owing to the difficulty of sorting large numbers of single species, the majority of the earlier determinations were necessarily carried out on mixed zooplankton hauls (Brandt, 1898;Brandt & Raben, 1919;Moberg, 1926;Wimpenny, 1929;Drummond & Gunther, 1934;Vinogradov, 1953). Most of these analyses suggested a relatively high protein and fat content, and this was confirmed by Orr (1934 a), who investigated the chemical composition of a single species, Calanus finmarchicus. Orr's result gave fat, protein and chitin as 20-40,35-5°and 3 %, respectively of dry weight. Similar high values were also reported by Orr (1934b) for Euchaeta norvegica. The carbohydrate content was not, however, estimated in either of Orr's investigations since large numbers of animals would have been required. Brandt (1898), after analysing mixed plankton hauls which were predominantly copepods, suggested a carbohydrate content of ca. 20 %.Although many workers have suggested that fat is used as substrate during the respiration of zooplankton, the role of carbohydrate is doubtful, since, there is so little information on the glycogen content and on the amount of monosaccharides in plankton animals. Lane, Posner & Greenfield (1952) and Greenfield (1953) reported very high glycogen values in prenatal larvae of Teredo, and noted a sharp reduction in the amount in free-swimming larvae. Collyer (1957) found the glycogen reserves in the larvae of Ostrea edulis to lie between 13'4 and 15'4 % of the dry organic matter, but found no correlation with size. It therefore appeared highly desirable to investigate the total carbohydrate content (i.e. glycogen and monosaccharides) in certain planktonic animals. It also was of interest to test whether the amount of carbohydrate varied with feeding and activity, since this might indicate whether carbohydrate was normally used as an energy source. MATERIAL AND METHODSExperiments were carried out with Calanus finmarchicus (Gunnerus)l and Neomysis integer (J. V. Thompson) at Plymouth, and with Pleurobrachia pileus (0. F. Muller) at Southampton. In each case the animals were picked 1 It is likely that since these specimens were collected in the English Channel they should be referred to the variety helgolandicus.

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Section: Discussionsupporting

confidence: 92%

Carbohydrates in some marine planktonic animals

Raymont

Krishnaswamy

1960

J. Mar. Biol. Ass.

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“…If the disappearance of the amounts of injected glucose from the blood of the normal and eyestalkless crabs in 5 and 3 hours respectively, is to be ascribed to its oxidation in tissues, a rate of combustion io times that of the usual at room temperature will have to be assumed . That this is not possible is shown by the observation made in crayfish 2 9 Hemingson (1924) . Therefore the disappearance of the injected glucose may safely be attributed to deposition of glycogen or some other form of storage .…”

Section: Discussionmentioning

confidence: 91%

Metabolic effects of eyestalk removal in the crab Varuna litterata (Fabricius)

Madhyastha¹,

Rangneker²

1976

Hydrobiologia

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Metabolic effects of eyestalk removal in the crab V. litterata is studied . Bilateral eyestalk ablation results in hypoglycaemia and a fall and rise in the glycogen content of hepatopancreas and muscle respectively . Injection of unboiled eyestalk extract evokes hyperglycaemia, whereas boiled eyestalk extract does not produce any significant change in the glycaemia level . The other effect of eyestalk removal is a fall in the fat content of the hepatopancreas and these results are discussed .

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