Cytochemical and physiological studies of the energetic metabolism and osmotrophy in Sagitta friderici (chaetognath)

  title={Cytochemical and physiological studies of the energetic metabolism and osmotrophy in Sagitta friderici (chaetognath)},
  author={Michel Duvert and L. Gourdoux and Robert Moreau},
  journal={Journal of the Marine Biological Association of the United Kingdom},
  pages={885 - 890}
Different glucidic labelled compounds were used for carbohydrate metabolism exploration, tissular glycogen storage localization and amino acid uptake response to osmotic variation in the adult of Sagitta friderici. After [1-14C] glucose or [6-14C] glucose (osmotrophic) assimilation, the relative activity of the different metabolic pathways (glycolysis–citric acid cycle and pentose cycle) have been estimated by means of a micro-radiorespirometric method. The kinetics of expired 14CO2 showed that… Expand
Changes in the structure and ultrastructure of the intestine of Spadella cephaloptera (Chaetognatha) during feeding and starvation experiments.
In starved specimens, major changes in A-cells occur between the sixth and tenth day of starvation and consist in the increase of endosome-like vacuoles, while necrosis features are evident in S-cells and after 30 days of starvation, necrosis Features are observed in the totality of the intestinal epithelium and the specimens die few days later. Expand
Non-carnivorous feeding in Arctic chaetognaths
The feeding history of chaetognaths in the Beaufort and Chukchi Seas, and Baffin Bay is analysed, suggesting that E. hamata likely receives a substantial energy input from algae and detritus and is thus not a strict carnivore and Calanus copepods are less important to its diet than other types of zooplankters. Expand
Chaetognaths feed primarily on dissolved and fine particulate organic matter, not on prey: implications for marine food webs
The role of chaetognaths should be revisited in the global ocean ecological balance, particularly with respect to vertical carbon flux, and also in predicting fishery resources. Expand


Adaptations by Invertebrate Larvae for Nutrient Acquisition from Seawater
Measurements of amino acid synthesis in larvae cultured under axenic conditions suggest that a much greater plasticity may exist in the biochemical requirements of larvae for dietary amino acids. Expand
Physiological and cytochemical studies of Ca in the primary muscle of the trunk of Sagitta setosa (chaetognath).
Physiological experiments show the central importance of the extracellular Ca(2+) and of its translocation through the membrane during the initiation of the contraction of the primary musculature. Expand
Integumental nutrient uptake by aquatic organisms.
Current and future studies on the mechanism and regulation of these processes, on the metabolic fate of accumulated DOM, and on the distribution of DOM in natural waters, promise to resolve the remaining issues on the role of integumental transport in the nutrition of aquatic organisms. Expand
Effects of intestinal insulin-like peptide on glucose catabolism in male adult Locusta migratoria
An insulin-like peptide (ILP) extracted from midgut of 25-day-old male adult Locusta migratoria can modify the relative activity of the two main pathways of glucose catabolism. The effect of ILP onExpand
Morphological study of the gut in Sagitta setosa , S. serratodentata and S. pacifica (Chaetognatha). Functional implications in digestive processes
The study of the digestive epithelium in Sagitta setosa , S. serratodentata , and S. pacifica revealed only a few morphological and cytological differences among the three species. The gut wasExpand
Development of the locomotory muscle of the chaetognath Sagitta. 2. Stereological study of fibre growth and differentiation processes.
These parameters reflect the organisation and the development of the fiber groups and cellular architecture and indicate the existence of unknown morphogenetic signals and fields, in this epithelial tissue having paracellular paths communicating with sea water. Expand
The junctional complex in the intestine of Sagitta setosa (Chaetognatha): the paired septate junction.
The junctional complex of the intestine of Sagitta setosa has been studied in tissues stained with uranyl acetate or after lanthanum impregnation, and by freeze-cleavage. All types of junctions haveExpand
Ultrastructural Studies of the Visceral Muscles of Chaetognaths
Some idea is given about the architecture of the body of Chaetognaths in relation to contractile structures and the ontogenetic relations between the polymorphic epithelium and the composite ‘mesenteries’ remain to be established. Expand
The primary body-wall musculature in the arrow-worm Sagitta setosa (Chaetognatha): an ultrastructural study.
The presence of at least two kinds of fibers in the primary musculature and the presence of the secondaryMusculature would suggest that the displacements of sagitta may be more complex than is generally admitted. Expand
Feeding of Zooplankton, with Special Reference to Some Experiments with Sagitta
THE chaetognaths have long been known as active carnivores1, though knowledge of their feeding behaviour is limited to qualitative observations on the nature of their food, and mode of operation ofExpand