Anaerobic degradation of glycogen inTubifex tubifex M.

Schöttler, Udo; Schroff, Gotthard

doi:10.1007/bf00691673

Cited by 78 publications

(12 citation statements)

References 16 publications

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“…While in Nereis pelagica and in N. diversicolor the concentrations of glutamate remained constant during anaerobiosis some increase was found in N. virens during prolonged anoxia, as has been reported previously from Tubifex tubifex (Schottler and Schroff, 1976). The origin of this accumulated glutamate is still unknown.…”

Section: Discussionsupporting

confidence: 49%

“…As in other facultative anaerobes (Schottler and Schroff, 1976;d e Zwaan, 1977;Felbeck, 1979) alanine accumulation in Nereis diversicolor only takes place shortly after the onset of anaerobiosis. On the other hand, N. virens apparently accumulates alanine as long as the anaerobic state lasts.…”

Section: Discussionmentioning

confidence: 69%

“…The significance of alanine production for anaerobic energy production is still unknown. In other annelids the C-skeleton of this amino acid was shown to be derived from glycogen (Zebe, 1975;Schottler and Schroff, 1976); however the origin of the amino group remains unexplained. Theoretically it seems possible that aspartate, which is metabolized during the initial phase of anaerobiosis, may be the main donor of this group.…”

Section: Discussionmentioning

confidence: 99%

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On the Anaerobic Metabolism of Three Species of Nereis (Annelida)

Schöttler¹

1979

Mar. Ecol. Prog. Ser.

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MSTRACT: Endproducts of anaerobic metabolism were examined in Nereis diversicolor, N. virens and N. pelagica. These nereids tend to be exposed to different degrees of hypoxia in their natural habitats. Accordingly, they exhibit different degrees of tolerance to anaerobiosis. The present study reveals: (1) In contrast to all previously examined facultative anaerobe annelids all three nereids produce high amounts of D-lactate. (2) N. diversicolor and N. rirens (to a lesser degree) are able to switch, during longlasting anaerobiosis, to the energetically more convenient degradation of glycogen to succlnate and volatile fatty acids. (3) In N. pelagica, however, production of volatile fatty acids is only of minor importance. (4) In all three nereids, alanlne is accumulated during the beginning of anaerobiosis; but in N. virens alanine production continues during longlasting anaerobiosis, although at a lower rate. Variations in responses to anaerobic conditions are also reflected by the 'energy charge', which decreases within 36 h from 0.88 to 0.66 in N. pelagica, whereas in N. virens and N. diversicolor it decreases w~t h i n 72 h from 0.90 or 0.88, respectively, to 0.70. The metabolic pathway of energy production during functional anaerobiosis, caused by extensive muscular work (electrical stimulation), was examined. All three species accumulate D-lactate in considerable amounts; however, succinate or volatile fatty acids were not synthesized.

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Section: Discussionsupporting

confidence: 49%

Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 99%

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On the Anaerobic Metabolism of Three Species of Nereis (Annelida)

Schöttler¹

1979

Mar. Ecol. Prog. Ser.

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“…obsew.). (2) If storage of reserves for temporary anaerobic respiration is combined with an extended blood vascular system capable of carrying high oxygen loads even under adverse oxic conditions -as in some mud-living tubificids (Schottler and Schroff, 1976;Hoffmann, 1978) or in the vestimentiferan pogonophore Riftia from extremely hypoxic deep sea bottoms (Arp and Childress, 1981) -chances for a longer endurance in or underneath the RPD layer would be enhanced. In P. leukodermatus, the very wide blood vessels traversing the coelomic cavity, are an unusual anatomical feature, suitable for efficient oxygen transport (Giere, 1981).…”

Section: Discussionmentioning

confidence: 99%

Habitat Conditions and Distribution Pattern of the Gutless Oligochaete Phallodrilus leukodermatus

Giere¹,

Liebezeit²,

Dawson³

1982

Mar. Ecol. Prog. Ser.

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“…These conditions are chosen to provide maximal estimations of the heat effects accompanying fermentative reactions under physiological conditions. Accordingly the maximal caloric equivalent of the average anoxic endproduct of Tubifex ~iochemi~l data in [ 2)) is -146 kJjmo1 organic acid. Dry weight is 17% of the wet weight c Percentage of calculated to measured rate of heat production; mean values with limits of ratios given in brackets as (F, -s,)/(F* + sz) x 100 to (F) + S,)/(.F> -sz) x 100.…”

Section: Discrepancy Between Direct and Indirect Calorimetry Of Anoximentioning

confidence: 99%

Energetics of invertebrate anoxibiosis: direct calorimetry in aquatic oligochaetes

Gnaiger

1980

FEBS Letters

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Anaerobic degradation of glycogen inTubifex tubifex M.

Cited by 78 publications

References 16 publications

On the Anaerobic Metabolism of Three Species of Nereis (Annelida)

On the Anaerobic Metabolism of Three Species of Nereis (Annelida)

Habitat Conditions and Distribution Pattern of the Gutless Oligochaete Phallodrilus leukodermatus

Energetics of invertebrate anoxibiosis: direct calorimetry in aquatic oligochaetes

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