Giant tube worms
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Annelida
Clade: Pleistoannelida
Subclass: Sedentaria
Order: Sabellida
Family: Siboglinidae
Genus: Riftia
M. L. Jones, 1981
Species:
R. pachyptila
Binomial name
Riftia pachyptila
M. L. Jones, 1981

Riftia pachyptila, commonly known as the giant tube worm and less commonly known as the giant beardworm, is a marine invertebrate in the phylum Annelida[1] (formerly grouped in phylum Pogonophora and Vestimentifera) related to tube worms commonly found in the intertidal and pelagic zones. R. pachyptila lives on the floor of the Pacific Ocean near hydrothermal vents. The vents provide a natural ambient temperature in their environment ranging from 2 to 30 °C,[2] and this organism can tolerate extremely high hydrogen sulfide levels. These worms can reach a length of 3 m (9 ft 10 in),[3] and their tubular bodies have a diameter of 4 cm (1.6 in).

Its common name "giant tube worm" is, however, also applied to the largest living species of shipworm, Kuphus polythalamius, which despite the name "worm", is a bivalve mollusc rather than an annelid.

Discovery

DSV Alvin, the Navy research submarine

R. pachyptila was discovered in 1977 on an expedition of the American bathyscaphe DSV Alvin to the Galápagos Rift led by geologist Jack Corliss.[4] The discovery was unexpected, as the team was studying hydrothermal vents and no biologists were included in the expedition. Many of the species found living near hydrothermal vents during this expedition had never been seen before.

At the time, the presence of thermal springs near the midoceanic ridges was known. Further research uncovered aquatic life in the area, despite the high temperature (around 350–380 °C).[5][6]

Many samples were collected, including bivalves, polychaetes, large crabs, and R. pachyptila.[7][8] It was the first time that species was observed.

Development

R. pachyptila develops from a free-swimming, pelagic, nonsymbiotic trochophore larva, which enters juvenile (metatrochophore) development, becoming sessile, and subsequently acquiring symbiotic bacteria.[9][10] The symbiotic bacteria, on which adult worms depend for sustenance, are not present in the gametes, but are acquired from the environment through the skin in a process akin to an infection. The digestive tract transiently connects from a mouth at the tip of the ventral medial process to a foregut, midgut, hindgut, and anus and was previously thought to have been the method by which the bacteria are introduced into adults. After symbionts are established in the midgut, they undergo substantial remodelling and enlargement to become the trophosome, while the remainder of the digestive tract has not been detected in adult specimens.[11]

Body structure

Isolating the vermiform body from white chitinous tube, a small difference exists from the classic three subdivisions typical of phylum Pogonophora:[12] the prosoma, the mesosoma, and the metasoma.

R. pachyptila community with extroflexion of red branchial plume

The first body region is the vascularized branchial plume, which is bright red due to the presence of hemoglobin that contain up to 144 globin chains (each presumably including associated heme structures). These tube worm hemoglobins are remarkable for carrying oxygen in the presence of sulfide, without being inhibited by this molecule, as hemoglobins in most other species are.[13][14] The plume provides essential nutrients to bacteria living inside the trophosome. If the animal perceives a threat or is touched, it retracts the plume and the tube is closed due to the obturaculum, a particular operculum that protects and isolates the animal from the external environment.[15]

The second body region is the vestimentum, formed by muscle bands, having a winged shape, and it presents the two genital openings at the end.[16][17] The heart, extended portion of dorsal vessel, enclose the vestimentum.[18]

Hydrothermal vent tubeworms get organic compounds from bacteria that live in their trophosome

In the middle part, the trunk or third body region, is full of vascularized solid tissue, and includes body wall, gonads, and the coelomic cavity. Here is located also the trophosome, spongy tissue where a billion symbiotic, thioautotrophic bacteria and sulfur granules are found.[19][20] Since the mouth, digestive system, and anus are missing, the survival of R. pachyptila is dependent on this mutualistic symbiosis.[21] This process, known as chemosynthesis, was recognized within the trophosome by Colleen Cavanaugh.[21]

The soluble hemoglobins, present in the tentacles, are able to bind O2 and H2S, which are necessary for chemosynthetic bacteria. Due to the capillaries, these compounds are absorbed by bacteria.[22] During the chemosynthesis, the mitochondrial enzyme rhodanase catalyzes the disproportionation reaction of the thiosulfate anion S2O32- to sulfur S and sulfite SO32- .[23][24] The R. pachyptila’s bloodstream is responsible for absorption of the O2 and nutrients such as carbohydrates.

Nitrate and nitrite are toxic, but are required for biosynthetic processes. The chemosynthetic bacteria within the trophosome convert nitrate to ammonium ions, which then are available for production of amino acids in the bacteria, which are in turn released to the tube worm. To transport nitrate to the bacteria, R. pachyptila concentrates nitrate in its blood, to a concentration 100 times more concentrated than the surrounding water. The exact mechanism of R. pachyptila’s ability to withstand and concentrate nitrate is still unknown.[14]

In the posterior part, the fourth body region, is the opistosome, which anchors the animal to the tube and is used for the storage of waste from bacterial reactions.[25]

Symbiosis

The discovery of bacterial invertebrate chemoautotrophic symbiosis, particularly in vestimentiferan tubeworms R. pachyptila[21] and then in vesicomyid clams and mytilid mussels revealed the chemoautotrophic potential of the hydrothermal vent tube worm.[26] Scientists discovered a remarkable source of nutrition that helps to sustain the conspicuous biomass of invertebrates at vents.[26] Many studies focusing on this type of symbiosis revealed the presence of chemoautotrophic, endosymbiotic, sulfur-oxidizing bacteria mainly in R. pachyptila,[27] which inhabits extreme environments and is adapted to the particular composition of the mixed volcanic and sea waters.[28] This special environment is filled with inorganic metabolites, essentially carbon, nitrogen, oxygen, and sulfur. In its adult phase, R. pachyptila lacks a digestive system. To provide its energetic needs, it retains those dissolved inorganic nutrients (sulfide, carbon dioxide, oxygen, nitrogen) into its plume and transports them through a vascular system to the trophosome, which is suspended in paired coelomic cavities and is where the intracellular symbiotic bacteria are found.[20][29][30] The trophosome[31] is a soft tissue that runs through almost the whole length of the tube's coelom. It retains a large number of bacteria on the order of 109 bacteria per gram of fresh weight.[32] Bacteria in the trophosome are retained inside bacteriocytes, thereby having no contact with the external environment. Thus, they rely on R. pachyptila for the assimilation of nutrients needed for the array of metabolic reactions they employ and for the excretion of waste products of carbon fixation pathways. At the same time, the tube worm depends completely on the microorganisms for the byproducts of their carbon fixation cycles that are needed for its growth.

Initial evidence for a chemoautotrophic symbiosis in R. pachyptila came from microscopic and biochemical analyses showing Gram-negative bacteria packed within a highly vascularized organ in the tubeworm trunk called the trophosome.[21] Additional analyses involving stable isotope,[33] enzymatic,[34][26] and physiological[35] characterizations confirmed that the end symbionts of R. pachyptila oxidize reduced-sulfur compounds to synthesize ATP for use in autotrophic carbon fixation through the Calvin cycle. The host tubeworm enables the uptake and transport of the substrates required for thioautotrophy, which are HS−, O2, and CO2, receiving back a portion of the organic matter synthesized by the symbiont population. The adult tubeworm, given its inability to feed on particulate matter and its entire dependency on its symbionts for nutrition, the bacterial population is then the primary source of carbon acquisition for the symbiosis. Discovery of bacterial–invertebrate chemoautotrophic symbioses, initially in vestimentiferan tubeworms[21][26] and then in vesicomyid clams and mytilid mussels,[26] pointed to an even more remarkable source of nutrition sustaining the invertebrates at vents.

Endosymbiosis with chemoautotrophic bacteria

A wide range of bacterial diversity is associated with symbiotic relationships with R. pachyptila. Many bacteria belong to the phylum Campylobacterota (formerly class Epsilonproteobacteria)[36] as supported by the recent discovery in 2016 of the new species Sulfurovum riftiae belonging to the phylum Campylobacterota, family Helicobacteraceae isolated from R. pachyptila collected from the East Pacific Rise.[37] Other symbionts belong to the class Delta-, Alpha- and Gammaproteobacteria.[36] The Candidatus Endoriftia persephone (Gammaproteobacteria) is a facultative R. pachyptila symbiont and has been shown to be a mixotroph, thereby exploiting both Calvin Benson cycle and reverse TCA cycle (with an unusual ATP citrate lyase) according to availability of carbon resources and whether it is free living in the environment or inside a eukaryotic host. The bacteria apparently prefer a heterotrophic lifestyle when carbon sources are available.[31]

Evidence based on 16S rRNA analysis affirms that R. pachyptila chemoautotrophic bacteria belong to two different clades: Gammaproteobacteria[38][20] and Campylobacterota (e.g. Sulfurovum riftiae)[37] that get energy from the oxidation of inorganic sulfur compounds such as hydrogen sulfide (H2S, HS−, S2-) to synthesize ATP for carbon fixation via the Calvin cycle.[20] Unfortunately, most of these bacteria are still uncultivable. Symbiosis works so that R. pachyptila provides nutrients such as HS−, O2, CO2 to bacteria, and in turn it receives organic matter from them. Thus, because of lack of a digestive system, R. pachyptila depends entirely on its bacterial symbiont to survive.[39][40]

In the first step of sulfide-oxidation, reduced sulfur (HS−) passes from the external environment into R. pachyptila blood, where, together with O2, it is bound by hemoglobin, forming the complex Hb-O2-HS− and then it is transported to the trophosome, where bacterial symbionts reside. Here, HS− is oxidized to elemental sulfur (S0) or to sulfite (SO32-).[20]

In the second step, the symbionts make sulfite-oxidation by the "APS pathway", to get ATP. In this biochemical pathway, AMP reacts with sulfite in the presence of the enzyme APS reductase, giving APS (adenosine 5'-phosphosulfate). Then, APS reacts with the enzyme ATP sulfurylase in presence of pyrophosphate (PPi) giving ATP (substrate-level phosphorylation) and sulfate (SO42-) as end products.[20] In formulas:

The electrons released during the entire sulfide-oxidation process enter in an electron transport chain, yielding a proton gradient that produces ATP (oxidative phosphorylation). Thus, ATP generated from oxidative phosphorylation and ATP produced by substrate-level phosphorylation become available for CO2 fixation in Calvin cycle, whose presence has been demonstrated by the presence of two key enzymes of this pathway: phosphoribulokinase and RubisCO.[26][41]

To support this unusual metabolism, R. pachyptila has to absorb all the substances necessary for both sulfide-oxidation and carbon fixation, that is: HS−, O2 and CO2 and other fundamental bacterial nutrients such as N and P. This means that the tubeworm must be able to access both oxic and anoxic areas.

Oxidation of reduced sulfur compounds requires the presence of oxidized reagents such as oxygen and nitrate. Hydrothermal vents are characterized by conditions of high hypoxia. In hypoxic conditions, sulfur-storing organisms start producing hydrogen sulfide. Therefore, the production of in H2S in anaerobic conditions is common among thiotrophic symbiosis. H2S can be damaging for some physiological processes as it inhibits the activity of cytochrome c oxidase, consequentially impairing oxidative phosphorylation. In R. pachyptila the production of hydrogen sulfide starts after 24h of hypoxia. In order to avoid physiological damage some animals, including Riftia pachyptila are able to bind H2S to haemoglobin in the blood to eventually expel it in the surrounding environment.

Carbon fixation and organic carbon assimilation

Unlike metazoans, which respire carbon dioxide as a waste product, R. pachyptila-symbiont association has a demand for a net uptake of CO2 instead, as a cnidarian-symbiont associations.[42] Ambient deep-sea water contains an abundant amount of inorganic carbon in the form of bicarbonate HCO3−, but it is actually the chargeless form of inorganic carbon, CO2, that is easily diffusible across membranes. The low partial pressures of CO2 in the deep-sea environment is due to the seawater alkaline pH and the high solubility of CO2, yet the pCO2 of the blood of R. pachyptila may be as much as two orders of magnitude greater than the pCO2 of deep-sea water.[42]

CO2 partial pressures are transferred to the vicinity of vent fluids due to the enriched inorganic carbon content of vent fluids and their lower pH.[20] CO2 uptake in the worm is enhanced by the higher pH of its blood (7.3–7.4), which favors the bicarbonate ion and thus promotes a steep gradient across which CO2 diffuses into the vascular blood of the plume.[43][20] The facilitation of CO2 uptake by high environmental pCO2 was first inferred based on measures of elevated blood and coelomic fluid pCO2 in tubeworms, and was subsequently demonstrated through incubations of intact animals under various pCO2 conditions.[30]

Once CO2 is fixed by the symbionts, it must be assimilated by the host tissues. The supply of fixed carbon to the host is transported via organic molecules from the trophosome in the hemolymph, but the relative importance of translocation and symbiont digestion is not yet known.[30][44] Studies proved that within 15 min, the label first appears in symbiont-free host tissues, and that indicates a significant amount of release of organic carbon immediately after fixation. After 24 h, labeled carbon is clearly evident in the epidermal tissues of the body wall. Results of the pulse-chase autoradiographic experiments were also evident with ultrastructural evidence for digestion of symbionts in the peripheral regions of the trophosome lobules.[44][45]

Sulfide acquisition

In deep-sea hydrothermal vents, sulfide and oxygen are present in different areas. Indeed, the reducing fluid of hydrothermal vents is rich in sulfide, but poor in oxygen, whereas sea water is richer in dissolved oxygen. Moreover, sulfide is immediately oxidized by dissolved oxygen to form partly, or totally, oxidized sulfur compounds like thiosulfate (S2O32-) and ultimately sulfate (SO42-), respectively less, or no longer, usable for microbial oxidation metabolism.[46] This causes the substrates to be less available for microbial activity, thus bacteria are constricted to compete with oxygen to get their nutrients. In order to avoid this issue, several microbes have evolved to make symbiosis with eukaryotic hosts.[47][20] In fact, R. pachyptila is able to cover the oxic and anoxic areas to get both sulfide and oxygen[48][49][50] thanks to its hemoglobin that can bind sulfide reversibly and apart from oxygen by functional binding sites determined to be zinc ions embedded in the A2 chains of the hemoglobins.[51][52][53] and then transport it to the trophosome, where bacterial metabolism can occur. It has also been suggested that cysteine residues are involved in this process.[54][55][56]

Symbiont acquisition

The acquisition of a symbiont by a host can occur in these ways:

Evidence suggests that R. pachyptila acquires its symbionts through its environment. In fact, 16S rRNA gene analysis showed that vestimentiferan tubeworms belonging to three different genera: Riftia, Oasisia, and Tevnia, share the same bacterial symbiont phylotype.[57][58][59][60][61]

This proves that R. pachyptila takes its symbionts from a free-living bacterial population in the environment. Other studies also support this thesis, because analyzing R. pachyptila eggs, 16S rRNA belonging to the symbiont was not found, showing that the bacterial symbiont is not transmitted by vertical transfer.[62]

Another proof to support the environmental transfer comes from several studies conducted in the late 1990s.[63] PCR was used to detect and identify a R. pachyptila symbiont gene whose sequence was very similar to the fliC gene that encodes some primary protein subunits (flagellin) required for flagellum synthesis. Analysis showed that R. pachyptila symbiont has at least one gene needed for flagellum synthesis. Hence, the question arose as to the purpose of the flagellum. Flagellar motility would be useless for a bacterial symbiont transmitted vertically, but if the symbiont came from the external environment, then a flagellum would be essential to reach the host organism and to colonize it. Indeed, several symbionts use this method to colonize eukaryotic hosts.[64][65][66][67]

Thus, these results confirm the environmental transfer of R. pachyptila symbiont.

Reproduction

R. pachyptila[68] is a dioecious vestimentiferan.[69] Individuals of this species are sessile and are found clustered together around deep-sea hydrothermal vents of the East Pacific Rise and the Galapagos Rift.[70] The size of a patch of individuals surrounding a vent is within the scale of tens of metres.[71]

The male's spermatozoa are thread-shaped and are composed of three distinct regions: the acrosome (6 μm), the nucleus (26 μm) and the tail (98 μm). Thus, the single spermatozoa is about 130 μm long overall, with a diameter of 0.7 μm, which becomes narrower near the tail area, reaching 0.2 μm. The sperm is arranged into an agglomeration of around 340-350 individual spermatozoa that create a torch-like shape. The cup part is made up of acrosomes and nucleus, while the handle is made up by the tails. The spermatozoa in the package are held together by fibrils. Fibrils also coat the package itself to ensure cohesion.[citation needed]

The large ovaries of females run within the gonocoel along the entire length of the trunk and are ventral to the trophosome. Eggs at different maturation stages can be found in the middle area of the ovaries, and depending on their developmental stage, are referred to as: oogonia, oocytes, and follicular cells. When the oocytes mature, they acquire protein and lipid yolk granules.[citation needed]

Males release their sperm into sea water. While the released agglomerations of spermatozoa, referred to as spermatozeugmata, do not remain intact for more than 30 seconds in laboratory conditions, they may maintain integrity for longer periods of time in specific hydrothermal vent conditions. Usually, the spermatozeugmata swim into the female's tube. Movement of the cluster is conferred by the collective action of each spermatozoon moving independently. Reproduction has also been observed involving only a single spermatozoon reaching the female's tube. Generally, fertilization in R. pachyptila is considered internal. However, some argue that, as the sperm is released into sea water and only afterwards reaches the eggs in the oviducts, it should be defined as internal-external.[citation needed]

R. pachyptila is completely dependent on the production of volcanic gases and the presence of sulfide-oxidizing bacteria. Therefore, its metapopulation distribution is profoundly linked to volcanic and tectonic activity that create active hydrothermal vent sites with a patchy and ephemeral distribution. The distance between active sites along a rift or adjacent segments can be very high, reaching hundreds of km.[70] This raises the question regarding larval dispersal. R. pachytpila is capable of larval dispersal across distances of 100 to 200 km[70] and cultured larvae show to be viable for 38 days.[72] Though dispersal is considered to be effective, the genetic variability observed in R. pachyptila metapopulation is low compared to other vent species. This may be due to high extinction events and colonization events, as R. pachyptila is one of the first species to colonize a new active site.[70]

The endosymbionts of R. pachyptila are not passed to the fertilized eggs during spawning, but are acquired later during the larval stage of the vestimentiferan worm. R. pachyptila planktonic larvae that are transported through sea-bottom currents until they reach active hydrothermal vents sites, are referred to as trophocores. The trophocore stage lacks endosymbionts, which are acquired once larvae settle in a suitable environment and substrate. Free-living bacteria found in the water column are ingested randomly and enter the worm through a ciliated opening of the branchial plume. This opening is connected to the trophosome through a duct that passes through the brain. Once the bacteria are in the gut, the ones that are beneficial to the individual, namely sulfide- oxidizing strains are phaghocytized by epithelial cells found in the midgut are then retained. Bacteria that do not represent possible endosymbionts are digested. This raises questions as to how R. pachyptila manages to discern between essential and nonessential bacterial strains. The worm's ability to recognise a beneficial strain, as well as preferential host-specific infection by bacteria have been both suggested as being the drivers of this phenomenon.[11]

Growth rate and age

R. pachyptila has the fastest growth rate of any known marine invertebrate. These organisms have been known to colonize a new site, grow to sexual maturity, and increase in length to 4.9 feet (1.5 m) in less than two years.[73]

Because of the peculiar environment in which R. pachyptila thrives, this species differs greatly from other deep-sea species that do not inhabit hydrothermal vents sites; the activity of diagnostic enzymes for glycolysis, citric acid cycle and transport of electrons in the tissues of R. pachyptila is very similar to the activity of these enzymes in the tissues of shallow-living animals. This contrasts with the fact that deep-sea species usually show very low metabolic rates, which in turn suggests that low water temperature and high pressure in the deep sea do not necessarily limit the metabolic rate of animals and that hydrothermal vents sites display characteristics that are completely different from the surrounding environment, thereby shaping the physiology and biological interactions of the organisms living in these sites.[32]


See also

References

  1. ^ Ruppert E, Fox R, Barnes R (2007). Invertebrate Zoology: A functional Evolutionary Approach (7th ed.). Belmont: Thomson Learning. ISBN 978-0-03-025982-1.
  2. ^ Bright M, Lallier FH (2010). "The biology of vestimentiferan tubeworms". Oceanography and Marine Biology (PDF). Oceanography and Marine Biology - an Annual Review. Vol. 48. Taylor & Francis. pp. 213–266. doi:10.1201/ebk1439821169-c4. ISBN 978-1-4398-2116-9. Archived from the original (PDF) on 31 October 2013. Retrieved 30 October 2013.
  3. ^ McClain, Craig R.; Balk, Meghan A.; Benfield, Mark C.; Branch, Trevor A.; Chen, Catherine; Cosgrove, James; Dove, Alistair D.M.; Gaskins, Lindsay C.; Helm, Rebecca R. (2015-01-13). "Sizing ocean giants: patterns of intraspecific size variation in marine megafauna". PeerJ. 3: e715. doi:10.7717/peerj.715. PMC 4304853. PMID 25649000.
  4. ^ "Giant Tube Worm: Riftia pachyptila". Smithsonian National Museum of Natural History. Archived from the original on 24 October 2018. Retrieved 25 October 2018.
  5. ^ "Exploring the deep ocean floor: Hot springs and strange creatures".
  6. ^ Koschinsky A, Garbe-Schönberg D, Sander S, Schmidt K, Gennerich HH, Strauss H (2008). "Hydrothermal venting at pressure-temperature conditions above the critical point of seawater, 5°S on the Mid-Atlantic Ridge". Geology. 36 (8): 615. Bibcode:2008Geo....36..615K. doi:10.1130/g24726a.1.
  7. ^ Childress JJ (October 1988). "Biology and chemistry of a deep-sea hydrothermal vent on the Galapagos Rift; the Rose Garden in 1985. Introduction". Deep Sea Research Part A. Oceanographic Research Papers. 35 (10–11): 1677–1680. Bibcode:1988DSRA...35.1677C. doi:10.1016/0198-0149(88)90043-X.
  8. ^ Lutz R (1 January 1991). "The biology of deep-sea vents and seeps: Alvin's magical mystery tour". Oceanus. 34 (4): 75–83. ISSN 0029-8182. Archived from the original on 22 December 2019. Retrieved 22 December 2019.
  9. ^ Bright M. "Riftia pachyptila". Archived from the original on 2015-04-02. Retrieved 2015-03-19.
  10. ^ Adams DK, Arellano SM, Govenar B (Mar 2012). "Larval dispersal: Vent life in the ocean column" (PDF). Oceanography.
  11. ^ a b Jones ML, Gardiner SL (Oct 1989). "On the early development of the vestimentiferan tube worm Ridgeia sp. and observations on the nervous system and trophosome of Ridgeia sp. and Riftia pachyptila" (PDF). Biological Bulletin. 177 (2): 254–276. doi:10.2307/1541941. JSTOR 1541941. Archived from the original (PDF) on 2015-09-23. Retrieved 2015-03-19.
  12. ^ De Beer G (November 1955). "The Pogonophora". Nature. 176 (4488): 888. Bibcode:1955Natur.176..888D. doi:10.1038/176888a0. S2CID 4198316.
  13. ^ Zal F, Lallier FH, Green BN, Vinogradov SN, Toulmond A (April 1996). "The multi-hemoglobin system of the hydrothermal vent tube worm Riftia pachyptila. II. Complete polypeptide chain composition investigated by maximum entropy analysis of mass spectra". The Journal of Biological Chemistry. 271 (15): 8875–81. doi:10.1074/jbc.271.15.8875. PMID 8621529.
  14. ^ a b Hahlbeck E, Pospesel MA, Zal F, Childress JJ, Felbeck H (July 2005). "Proposed nitrate binding by hemoglobin in Riftia pachyptila" (Free full text). Deep-Sea Research Part I: Oceanographic Research Papers. 52 (10): 1885–1895. doi:10.1016/j.dsr.2004.12.011.
  15. ^ Monaco A, Prouzet P (2015-10-02). Marine Ecosystems: Diversity and Functions. John Wiley & Sons. ISBN 978-1-119-23246-9.
  16. ^ Desbruyères D, Segonzac M (1997). Handbook of Deep-sea Hydrothermal Vent Fauna. Editions Quae. ISBN 978-2-905434-78-4.
  17. ^ Gibson RN, Atkinson RJ, Gordon JD (2010-05-12). Oceanography and Marine Biology: An Annual Review. CRC Press. ISBN 978-1-4398-5925-4.
  18. ^ Bartolomaeus T, Purschke G (2006-03-30). Morphology, Molecules, Evolution and Phylogeny in Polychaeta and Related Taxa. Dordrecht: Springer Science & Business Media. ISBN 978-1-4020-3240-0.
  19. ^ "Hydrothermal vents Terza parte". www.biologiamarina.eu. Retrieved 2019-12-10.
  20. ^ a b c d e f g h i Stewart FJ, Cavanaugh CM (2006). Overmann J (ed.). "Symbiosis of thioautotrophic bacteria with Riftia pachyptila". Progress in Molecular and Subcellular Biology. 41. Springer-Verlag: 197–225. doi:10.1007/3-540-28221-1_10. ISBN 978-3-540-28210-5. PMID 16623395.
  21. ^ a b c d e Cavanaugh CM, Gardiner SL, Jones ML, Jannasch HW, Waterbury JB (July 1981). "Prokaryotic cells in the hydrothermal vent tube worm Riftia pachyptila Jones: possible chemoautotrophic symbionts". Science. 213 (4505): 340–342. Bibcode:1981Sci...213..340C. doi:10.1126/science.213.4505.340. PMID 17819907.
  22. ^ Childress J, Fisher CR (1992). "The biology of hydrothermal vent animals: physiology, biochemistry, and autotrophic symbioses". Oceanography and Marine Biology: An Annual Review.
  23. ^ Corbera J (2017-04-21). "La vida que brolla a la foscor: les fumaroles hidrotermals submarines". L'Atzavara. 27: 39–53. ISSN 2339-9791.
  24. ^ Simon V, Purcarea C, Sun K, Joseph J, Frebourg G, Lechaire JP, Gaill F, Hervé G (2000-01-18). "The enzymes involved in synthesis and utilization of carbamylphosphate in the deep-sea tube worm Riftia pachyptila". Marine Biology. 136 (1): 115–127. doi:10.1007/s002270050014. S2CID 85309709.
  25. ^ "Riftia pachyptila - Wikipedia - Symbiotic relationship between chemosynthetic bacteria and riftia tube worms". Archived from the original on 2019-12-10. Retrieved 2019-12-10.
  26. ^ a b c d e f Felbeck H (July 1981). "Chemoautotrophic potential of the hydrothermal vent tube worm, Riftia pachyptila Jones (Vestimentifera)". Science. 213 (4505): 336–8. Bibcode:1981Sci...213..336F. doi:10.1126/science.213.4505.336. PMID 17819905.
  27. ^ Thiel M (2001-10-17). "Cindy Lee Van Dover: The ecology of deep-sea hydrothermal vents". Helgoland Marine Research. 55 (4): 308–309. doi:10.1007/s10152-001-0085-8.
  28. ^ Minic Z (2004). "Biochemical and enzymological aspects of the symbiosis between the deep-sea tubeworm Riftia pachyptila and its bacterial endosymbiont". European Journal of Biochemistry. 271 (15): 3093–102. doi:10.1111/j.1432-1033.2004.04248.x. PMID 15265029.
  29. ^ Childress JJ, Lee RW, Sanders NK, Felbeck H, Oros DR, Toulmond A, Desbruyeres D, Kennicutt II MC, Brooks J (1993). "Inorganic carbon uptake in hydrothermal vent tubeworms facilitated by high environmental pCO2". Nature. 362 (6416): 147–149. Bibcode:1993Natur.362..147C. doi:10.1038/362147a0. S2CID 4341949.
  30. ^ a b c Childress JJ, Arp AJ, Fisher CR (1984). "Metabolic and blood characteristics of the hydrothermal vent tube-worm Riftia pachyptila". Marine Biology. 83 (2): 109–124. doi:10.1007/bf00394718. S2CID 84806980.
  31. ^ a b Robidart JC, Bench SR, Feldman RA, Novoradovsky A, Podell SB, Gaasterland T, et al. (March 2008). "Metabolic versatility of the Riftia pachyptila endosymbiont revealed through metagenomics". Environmental Microbiology. 10 (3): 727–37. doi:10.1111/j.1462-2920.2007.01496.x. PMID 18237306.
  32. ^ a b Hand SC, Somero GN (August 1983). "Energy Metabolism Pathways of Hydrothermal Vent Animals: Adaptations to a Food-Rich and Sulfide-Rich Deep-Sea Environment". The Biological Bulletin. 165 (1): 167–181. doi:10.2307/1541362. JSTOR 1541362.
  33. ^ Rau GH (July 1981). "Hydrothermal Vent Clam and Tube Worm 13C/12C: Further Evidence of Nonphotosynthetic Food Sources". Science. 213 (4505): 338–40. Bibcode:1981Sci...213..338R. doi:10.1126/science.213.4505.338. PMID 17819906.
  34. ^ Renosto F, Martin RL, Borrell JL, Nelson DC, Segel IH (October 1991). "ATP sulfurylase from trophosome tissue of Riftia pachyptila (hydrothermal vent tube worm)". Archives of Biochemistry and Biophysics. 290 (1): 66–78. doi:10.1016/0003-9861(91)90592-7. PMID 1898101.
  35. ^ Fisher CR (1995). "Toward an Appreciation of Hydrothennal-Vent Animals: Their Environment, Physiological Ecology, and Tissue Stable Isotope Values". Seafloor Hydrothermal Systems: Physical, Chemical, Biological, and Geological Interactions. Geophysical Monograph Series. American Geophysical Union. pp. 297–316. doi:10.1029/gm091p0297. ISBN 978-1-118-66399-8.
  36. ^ a b López-García P, Gaill F, Moreira D (April 2002). "Wide bacterial diversity associated with tubes of the vent worm Riftia pachyptila". Environmental Microbiology. 4 (4): 204–15. doi:10.1046/j.1462-2920.2002.00286.x. PMID 12010127. S2CID 3940740.
  37. ^ a b Giovannelli D, Chung M, Staley J, Starovoytov V, Le Bris N, Vetriani C (July 2016). "Sulfurovum riftiae sp. nov., a mesophilic, thiosulfate-oxidizing, nitrate-reducing chemolithoautotrophic epsilonproteobacterium isolated from the tube of the deep-sea hydrothermal vent polychaete Riftia pachyptila". International Journal of Systematic and Evolutionary Microbiology. 66 (7): 2697–2701. doi:10.1099/ijsem.0.001106. PMID 27116914.
  38. ^ Distel DL, Lane DJ, Olsen GJ, Giovannoni SJ, Pace B, Pace NR, et al. (June 1988). "Sulfur-oxidizing bacterial endosymbionts: Analysis of phylogeny and specificity by 16S rRNA sequences". Journal of Bacteriology. 170 (6): 2506–10. doi:10.1128/jb.170.6.2506-2510.1988. PMC 211163. PMID 3286609.
  39. ^ Fisher CR (1995). "Toward an appreciation of hydrothennal-vent animals: Their environment, physiological ecology, and tissue stable isotope values". Washington DC American Geophysical Union Geophysical Monograph Series. Geophysical Monograph Series. 91: 297–316. Bibcode:1995GMS....91..297F. doi:10.1029/GM091p0297. ISBN 9781118663998.
  40. ^ Nelson DC (1995). "Chemoautotrophic and methanotrophic endosymbiotic bacteria at deep-sea vents and seeps". The Microbiology of Deep-Sea Hydrothermal Vents.
  41. ^ Robinson JJ, Stein JL, Cavanaugh CM (March 1998). "Cloning and sequencing of a form II ribulose-1,5-biphosphate carboxylase/oxygenase from the bacterial symbiont of the hydrothermal vent tubeworm Riftia pachyptila". Journal of Bacteriology. 180 (6): 1596–9. doi:10.1128/JB.180.6.1596-1599.1998. PMC 107066. PMID 9515935.
  42. ^ a b Van Dover CL, Lutz RA (2004). "Experimental ecology at deep-sea hydrothermal vents: a perspective". Journal of Experimental Marine Biology and Ecology. 300 (1–2): 273–307. doi:10.1016/j.jembe.2003.12.024.
  43. ^ Goffredi SK, Childress JJ (2001). "Activity and inhibitor sensitivity of ATPases in the hydrothermal vent tubeworm Riftia pachyptila: a comparative approach". Marine Biology. 138 (2): 259–265. doi:10.1007/s002270000462. S2CID 83539580.
  44. ^ a b Bright M, Keckeis H, Fisher CR (2000-05-19). "An autoradiographic examination of carbon fixation, transfer and utilization in the Riftia pachyptila symbiosis". Marine Biology. 136 (4): 621–632. doi:10.1007/s002270050722. S2CID 84235858.
  45. ^ Bright M, Sorgo A (2005-05-11). "Ultrastructural reinvestigation of the trophosome in adults of Riftia pachyptila (Annelida, Siboglinidae)". Invertebrate Biology. 122 (4): 347–368. doi:10.1111/j.1744-7410.2003.tb00099.x.
  46. ^ Zhang JZ, Millero FJ (1993). "The products from the oxidation of H2S in seawater". Geochimica et Cosmochimica Acta. 57 (8): 1705–1718. Bibcode:1993GeCoA..57.1705Z. doi:10.1016/0016-7037(93)90108-9.
  47. ^ Cavanaugh CM (1985). "Symbioses of chemoautotrophic bacteria and marine invertebrates from hydrothermal vents and reducing sediments". Bulletin of the Biological Society of Washington. 6: 373–388.
  48. ^ Cavanaugh CM (February 1994). "Microbial symbiosis: patterns of diversity in the marine environment". American Zoologist. 34 (1): 79–89. doi:10.1093/icb/34.1.79.
  49. ^ Fisher CR (1996). Ecophysiology of primary production at deep-sea vents and seeps (PDF).
  50. ^ Polz MF, Ott JA, Bregut M, Cavanaugh CM (2000). "When Bacteria Hitch a Ride". ASM News-American Society for Microbiology. 66 (9): 531–539.
  51. ^ Flores, Jason F.; Fisher, Charles R.; Carney, Susan L.; Green, Brian N.; Freytag, John K.; Schaeffer, Stephen W.; Royer, William E. (2005-02-22). "Sulfide binding is mediated by zinc ions discovered in the crystal structure of a hydrothermal vent tubeworm hemoglobin". Proceedings of the National Academy of Sciences. 102 (8): 2713–2718. doi:10.1073/pnas.0407455102. ISSN 0027-8424. PMC 549462. PMID 15710902.
  52. ^ Flores, Jason F.; Hourdez, téphane M. (2006). "The zinc-mediated sulfide-binding mechanism of hydrothermal vent tubeworm 400-kDa hemoglobin". Cahiers de Biologie Marine (CBM). 47: 371–377. doi:10.21411/cbm.a.11ae33dc.
  53. ^ Royer, William E.; Zhu, Hao; Gorr, Thomas A.; Flores, Jason F.; Knapp, James E. (2005). "Allosteric Hemoglobin Assembly: Diversity and Similarity". Journal of Biological Chemistry. 280 (30): 27477–27480. doi:10.1074/jbc.r500006200. ISSN 0021-9258.
  54. ^ Zal F, Suzuki T, Kawasaki Y, Childress JJ, Lallier FH, Toulmond A (December 1997). "Primary structure of the common polypeptide chain b from the multi-hemoglobin system of the hydrothermal vent tube worm Riftia pachyptila: an insight on the sulfide binding-site". Proteins. 29 (4): 562–574. doi:10.1002/(SICI)1097-0134(199712)29:4<562::AID-PROT15>3.0.CO;2-K. PMID 9408952. S2CID 25706128.
  55. ^ Zal F, Leize E, Lallier FH, Toulmond A, Van Dorsselaer A, Childress JJ (July 1998). "S-Sulfohemoglobin and disulfide exchange: the mechanisms of sulfide binding by Riftia pachyptila hemoglobins". Proceedings of the National Academy of Sciences of the United States of America. 95 (15): 8997–9002. Bibcode:1998PNAS...95.8997Z. doi:10.1073/pnas.95.15.8997. PMC 21191. PMID 9671793.
  56. ^ Bailly X, Jollivet D, Vanin S, Deutsch J, Zal F, Lallier F, Toulmond A (September 2002). "Evolution of the sulfide-binding function within the globin multigenic family of the deep-sea hydrothermal vent tubeworm Riftia pachyptila". Molecular Biology and Evolution. 19 (9): 1421–133. doi:10.1093/oxfordjournals.molbev.a004205. PMID 12200470.
  57. ^ Feldman RA, Black MB, Cary CS, Lutz RA, Vrijenhoek RC (September 1997). "Molecular phylogenetics of bacterial endosymbionts and their vestimentiferan hosts". Molecular Marine Biology and Biotechnology. 6 (3): 268–77. PMID 9284565.
  58. ^ Laue BE, Nelson DC (September 1997). "Sulfur-oxidizing symbionts have not co-evolved with their hydrothermal vent tube worm hosts: an RFLP analysis". Molecular Marine Biology and Biotechnology. 6 (3): 180–8. PMID 9284558.
  59. ^ Di Meo CA, Wilbur AE, Holben WE, Feldman RA, Vrijenhoek RC, Cary SC (February 2000). "Genetic variation among endosymbionts of widely distributed vestimentiferan tubeworms". Applied and Environmental Microbiology. 66 (2): 651–8. doi:10.1128/AEM.66.2.651-658.2000. PMC 91876. PMID 10653731.
  60. ^ Nelson K, Fisher CR (2000). "Absence of cospeciation in deep-sea vestimentiferan tube worms and their bacterial endosymbionts". Symbiosis. 28 (1): 1–15.
  61. ^ McMullin ER, Hourdez ST, Schaeffer SW, Fisher CR (2003). "Phylogeny and Biogeography of Deep Sea Vestimentiferan Tubeworms and Their Bacterial Symbionts" (PDF). Symbiosis. 34: 1–41.[permanent dead link]
  62. ^ Cary SC, Warren W, Anderson E, Giovannoni SJ (February 1993). "Identification and localization of bacterial endosymbionts in hydrothermal vent taxa with symbiont-specific polymerase chain reaction amplification and in situ hybridization techniques". Molecular Marine Biology and Biotechnology. 2 (1): 51–62. PMID 8364689.
  63. ^ Millikan DS, Felbeck H, Stein JL (July 1999). "Identification and characterization of a flagellin gene from the endosymbiont of the hydrothermal vent tubeworm Riftia pachyptila". Applied and Environmental Microbiology. 65 (7): 3129–33. doi:10.1128/AEM.65.7.3129-3133.1999. PMC 91466. PMID 10388713.
  64. ^ Chua KL, Chan YY, Gan YH (April 2003). "Flagella are virulence determinants of Burkholderia pseudomallei". Infection and Immunity. 71 (4): 1622–9. doi:10.1128/IAI.71.4.1622-1629.2003. PMC 152022. PMID 12654773.
  65. ^ Gavín R, Merino S, Altarriba M, Canals R, Shaw JG, Tomás JM (July 2003). "Lateral flagella are required for increased cell adherence, invasion and biofilm formation by Aeromonas spp". FEMS Microbiology Letters. 224 (1): 77–83. doi:10.1016/S0378-1097(03)00418-X. PMID 12855171.
  66. ^ Kirov SM (July 2003). "Bacteria that express lateral flagella enable dissection of the multifunctional roles of flagella in pathogenesis". FEMS Microbiology Letters. 224 (2): 151–9. doi:10.1016/S0378-1097(03)00445-2. PMID 12892877.
  67. ^ Dons L, Eriksson E, Jin Y, Rottenberg ME, Kristensson K, Larsen CN, et al. (June 2004). "Role of flagellin and the two-component CheA/CheY system of Listeria monocytogenes in host cell invasion and virulence". Infection and Immunity. 72 (6): 3237–44. doi:10.1128/IAI.72.6.3237-3244.2004. PMC 415653. PMID 15155625.
  68. ^ Jones ML (July 1981). "Riftia pachyptila Jones: Observations on the Vestimentiferan Worm from the Galapagos Rift". Science. 213 (4505): 333–6. Bibcode:1981Sci...213..333J. doi:10.1126/science.213.4505.333. PMID 17819904.
  69. ^ Karaseva NP, Rimskaya-Korsakova NN, Galkin SV, Malakhov VV (December 2016). "Taxonomy, geographical and bathymetric distribution of vestimentiferan tubeworms (Annelida, Siboglinidae)". Biology Bulletin. 43 (9): 937–969. doi:10.1134/S1062359016090132. S2CID 16005133.
  70. ^ a b c d Coykendall DK, Johnson SB, Karl SA, Lutz RA, Vrijenhoek RC (April 2011). "Genetic diversity and demographic instability in Riftia pachyptila tubeworms from eastern Pacific hydrothermal vents". BMC Evolutionary Biology. 11 (1): 96. doi:10.1186/1471-2148-11-96. PMC 3100261. PMID 21489281.
  71. ^ Cary SC, Felbeck H, Holland ND (1989). "Observations on the reproductive biology of the hydrothermal vent tube worm Riftia pachyptila". Marine Ecology Progress Series. 52: 89–94. Bibcode:1989MEPS...52...89C. doi:10.3354/meps052089.
  72. ^ Marsh AG, Mullineaux LS, Young CM, Manahan DT (May 2001). "Larval dispersal potential of the tubeworm Riftia pachyptila at deep-sea hydrothermal vents". Nature. 411 (6833): 77–80. Bibcode:2001Natur.411...77M. doi:10.1038/35075063. PMID 11333980. S2CID 411076.
  73. ^ Lutz RA, Shank TM, Fornari DJ, Haymon RM, Lilley MD, Von Damm KL, Desbruyeres D (1994). "Rapid growth at deep-sea vents". Nature. 371 (6499): 663–664. Bibcode:1994Natur.371..663L. doi:10.1038/371663a0. S2CID 4357672.

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