| Title | Geochemistry drives the allometric growth of the hydrothermal vent tubeworm Riftia pachyptila (Annelida: Siboglinidae) |
| Abstract | The tubeworm Riftia pachyptila is a key primarily producer in hydrothermal vent communities due to the symbiosis with sulphur-oxidizing bacteria, which provide nourishment to the worm from sulphides, oxygen and carbon dioxide. These substances diffuse from the vent water into the bloodstream of the worm through their tentacular crowns, and then to the bacteria, hosted in a specialized organ of the worm, called a trophosome. The uptake rates of these substances depend on the surface/volume relationship of the tentacles. We here describe two morphotypes, 'fat' and 'slim', respectively, from the basalt sulphide-rich vents at 9 °N and 21 °N at the East Pacific Rise, and the highly sedimented, sulphide-poor vents at 27 °N in the Guaymas Basin. The 'fat' morphotype has a thicker body and tube, longer trunk and smaller tentacular crowns, whereas the 'slim' morphotype has shorter trunk, thinner body and tube, and presents longer tentacular crowns and has a higher number of tentacular lamellae. Given the dependence on sulphides for the growth of R. pachyptila, as well as high genetic connectivity of the worm's populations along the studied localities, we suggest that such morphological differences are adaptive and selected to keep the sulphide uptake near to the optimum values for the symbionts. 'Fat' and 'slim' morphotypes are also found in the vestimentiferan Ridgeia piscesae in similar sulphide-rich and poor environments in the northern Pacific. |
| Source | Zoological journal of the Linnean Society 191 |
| Keywords | annelidariftia |
| Journal | Zoological journal of the Linnean Society |
| Editor | Academic Press.., [London], Regno Unito |
| Year | 2021 |
| Type | Articolo in rivista |
| DOI | 10.1093/zoolinnean/zlaa148 |
| Authors | Nadezhda Rimskaya-Korsakova, Diego Fontaneto, Sergey Galkin, Vladimir Malakhov, Alejandro Martínez |
| Text | 441383 2021 10.1093/zoolinnean/zlaa148 annelida riftia Geochemistry drives the allometric growth of the hydrothermal vent tubeworm Riftia pachyptila Annelida Siboglinidae Nadezhda Rimskaya Korsakova, Diego Fontaneto, Sergey Galkin, Vladimir Malakhov, Alejandro Martinez Department of Invertebrate Zoology, Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia Molecular Ecology Group MEG , Water Research Institute IRSA , National Research Council of Italy CNR , Verbania Pallanza, Italy Laboratory of Ocean Benthic Fauna, Shirshov Institute of Oceanology of the Russian Academy of Science, Moscow, Russia The tubeworm Riftia pachyptila is a key primarily producer in hydrothermal vent communities due to the symbiosis with sulphur oxidizing bacteria, which provide nourishment to the worm from sulphides, oxygen and carbon dioxide. These substances diffuse from the vent water into the bloodstream of the worm through their tentacular crowns, and then to the bacteria, hosted in a specialized organ of the worm, called a trophosome. The uptake rates of these substances depend on the surface/volume relationship of the tentacles. We here describe two morphotypes, fat and slim , respectively, from the basalt sulphide rich vents at 9 °N and 21 °N at the East Pacific Rise, and the highly sedimented, sulphide poor vents at 27 °N in the Guaymas Basin. The fat morphotype has a thicker body and tube, longer trunk and smaller tentacular crowns, whereas the slim morphotype has shorter trunk, thinner body and tube, and presents longer tentacular crowns and has a higher number of tentacular lamellae. Given the dependence on sulphides for the growth of R. pachyptila, as well as high genetic connectivity of the worm s populations along the studied localities, we suggest that such morphological differences are adaptive and selected to keep the sulphide uptake near to the optimum values for the symbionts. Fat and slim morphotypes are also found in the vestimentiferan Ridgeia piscesae in similar sulphide rich and poor environments in the northern Pacific. 191 Published version https //academic.oup.com/zoolinnean/advance article abstract/doi/10.1093/zoolinnean/zlaa148/6048373 redirectedFrom=fulltext nad 2021_ZoolJLinnSoc_Rimskaya Korsakova et al EV.pdf Articolo in rivista Academic Press.. 0024 4082 Zoological journal of the Linnean Society Zoological journal of the Linnean Society Zool. j. Linn. Soc. Zoological journal of the Linnean Society. diego.fontaneto FONTANETO DIEGO alejandro.martinezgarcia MARTINEZ GARCIA ALEJANDRO |
