Metabolic and blood characteristics of the hydrothermal vent tube-worm Riftia pachyptila

@article{Childress1984MetabolicAB,
  title={Metabolic and blood characteristics of the hydrothermal vent tube-worm Riftia pachyptila},
  author={James J. Childress and Alissa J. Arp and Charles R. Fisher},
  journal={Marine Biology},
  year={1984},
  volume={83},
  pages={109-124}
}
Specimens of the hydrothermal vent pogonophoran Riftia pachyptila Jones were collected by submersible at a depth of 2 600 m at the 21°N hydrothermal vent site on the East Pacific Rise (20°50′N, 109°06′W) in April and May of 1982. The worms were maintained in pressurized aquaria for up to 45 d for metabolic studies. Consumption of O2 was regulated down to low PO2 (oxygen partial pressure) values; O2 consumption rates were 0.63 and 1.12 μ mol g-1 wet wt h-1 at 2.5° and 8°C, respectively; such… Expand
Metabolic responses of the hydrothermal vent tube worm Riftia pachyptila to severe hypoxia
TLDR
R. pachyptila is phys~ologically well adapted to the oxygen fluctuations freq.uently occurring In the vent habitat. Expand
Unusual carbon dioxide-combining properties of body fluids in the hydrothermal vent tubeworm Riftia pachyptila
TLDR
It is proposed that the base excess has three main functions: first, to retain CO 2 in the body fluids when the external PCO 2 is low; second, to act as a buffer when external P CO 2 is high; third, to allow the large coelomic compartment to acts as a CO 2 store, thus permitting the symbiotic bacteria to fix carbon continuously even when the internal supply of carbon dioxide fluctuates. Expand
Metabolic and Blood Gas Transport Characteristics of the Hydrothermal Vent Bivalve Calyptogena magnifica
TLDR
The hypothesis that C. magnifica may take up sulfide through the foot and transport it to the bacteria in the gills via the sulfide-binding component in the blood serum while simultaneously taking up oxygen and carbon dioxide through the siphon is explored. Expand
Comparative Oxygen Consumption of Gastropod Holobionts from Deep-Sea Hydrothermal Vents in the Indian Ocean
TLDR
Findings indicate that the “trophosome” does not fundamentally increase oxygen requirement compared to other gastropod holobionts, and cold temperatures induce a stress response in Alviniconcha, resulting in aberrantly high uptake. Expand
The bacterial symbiont from the hydrothermal vent tubewormRiftia pachyptila is a sulfide specialist
TLDR
Whole-worm experiments under pressure showed a rapid removal of35S-sulfide from the incubation water, with sulfide, sulfate, and polysulfides appearing in the blood within 4 h, and there was no utilization of thiosulfate by the whole worms, freshly homogenized trophosome tissue, or isolated bacteria. Expand
Fate of Nitrate Acquired by the TubewormRiftia pachyptila
TLDR
A nitrogen flux model is described, in which the product of symbiont nitrate reduction, ammonia, is the primary source of nitrogen for the host and the symbionts and fulfills the association's nitrogen needs via incorporation of ammonia into amino acids. Expand
Physiological Functioning of Carbonic Anhydrase in the Hydrothermal Vent Tubeworm Riftia Pachyptila.
TLDR
R. pachyptila demonstrates very effective acquisition of inorganic carbon from the environment, thereby providing the symbionts with large amounts ofCO2, made possible by three factors: extremely effective pH regulation, a large external pool of CO2, and high levels of carbonic anhydrase. Expand
Proposed nitrate binding by hemoglobin in Riftia pachyptila blood
Riftia pachyptila lives in the unstable environment at hydrothermal vent sites along oceanic spreading zones in the Eastern Pacific. The tubeworm has a symbiosis with intracellular carbon-fixing andExpand
Nitrate respiration in the hydrothermal vent tubeworm Riftia pachyptila
TLDR
Results show that the bacteria of R. pachyptila may cover a significant fraction of their respiratory needs by the use of nitrate in addition to oxygen, which may have an important role in the colonization of hypoxic habitats in general by animals with this kind of symbiosis. Expand
Rate and process of tube production by the deep-sea hydrothermal vent tubeworm Riftia pachyptila
TLDR
The presence of clumps of freshly secreted tube material at the base of the exoskeleton as well as the new observation of bifid tubes allow us to propose a model of tube growth at both ends, which shows a variation of the gross morphology of the plume and the trunk of R. pachyptlla during growth and indicates that vestlmentum length and tube diamctrr could be useful indices of lndlv~dual and tube sizes. Expand
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References

SHOWING 1-10 OF 34 REFERENCES
Functional Characteristics of the Blood of the Deep-Sea Hydrothermal Vent Brachyuran Crab
TLDR
Hemocyanin in the whole blood of the hydrothermal vent brachyuran crab, Bythograea thermydron, has a moderate oxygen affinity and a moderately high degree of cooperativity, which characterize an oxygen transport system whose function appears to be largely independent of the wide range of environmental conditions encountered around the vents. Expand
Chemoautotrophic Potential of the Hydrothermal Vent Tube Worm, Riftia pachyptila Jones (Vestimentifera).
TLDR
Trophosome tissue of the hydrothermal vent tube worm, Riftia pachyptila (Vestimentifera), contains high activities of several enzymes associated with chemoautotrophic existence, consistent with an autotrophic mode of nutrition for this worm, which lives in hydrogen sulfide-rich waters and lacks a mouth and digestive system. Expand
Tide-related changes of blood respiratory variables in the lugworm Arenicola marina (l.).
TLDR
During the period of emersion at low tide the intertidal polychaete annelid Arenicola marina (L.) decreases its respiratory exchanges with the surrounding medium, and anaerobic metabolism then ensures survival; during 4 hr emersion, blood pH gradually decreases, and non volatile acid metabolites accumulate. Expand
Blood function in the hydrothermal vent vestimentiferan tube worm.
TLDR
Extracellular hemoglobin in the whole blood of Riftia pachyptila has a high oxygen affinity, which is compatible with the high oxygen demand of chemoautotrophic metabolism in the variable vent environment. Expand
Blood Components Prevent Sulfide Poisoning of Respiration of the Hydrothermal Vent Tube Worm Riftia pachyptila
TLDR
Avoidance of sulfide poisoning of respiration in Riftia pachyptila appears to involve a blood-borne factor having a higher sulfide affinity than that of cytochrome c oxidase, with the result that appreciable amounts of free sulfide are prevented from accumulating in the blood and entering the intracellular compartment. Expand
Microbial Processes at Deep Sea Hydrothermal Vents
The primary production of organic carbon by chemosynthetic sulfur-oxidizing bacteria has been proposed to provide the base of the food chain for the extensive populations of animals found atExpand
The Distribution and Community Structure of Megafauna at the Galapagos Rift Hydrothermal Vents
The distributions of the twenty-two megafaunal species at the Galapagos Rift hydrothermal vents vary markedly with respect to the discharging warm water. Vent associated water temperature ranged toExpand
Hydrothermal Vent Clam and Tube Worm 13C/12C: Further Evidence of Nonphotosynthetic Food Sources.
  • G. Rau
  • Biology, Medicine
  • Science
  • 1981
TLDR
Observations suggest that more than one nonpelagic and nonphotosynthetic carbon fixation pathway is of nutritional importance to vent animals, and that at least one of these pathways is common to two geographically separated vent sites. Expand
Low 15N/14N in hydrothermal vent animals: ecological implications
  • G. Rau
  • Environmental Science
  • Nature
  • 1981
Low-trophic-level animal biomass from the Galápagos and 21 °N hydrothermal vents was found to have 15N/14N ratios which are lower than those previously reported for organic nitrogen1–6,Expand
The structure of hemoglobin from an unusual deep sea worm (Vestimentifera)
TLDR
This Vestimentifera, which shows characteristics of both the phylum Pogonophora as well as Annelida, has an extracellular hemoglobin whose structure is very similar to that of annelid extrace cellular hemoglobins. Expand
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