Investigation of Capitella spp. symbionts in the context of varying anthropic pressures: First occurrence of a transient advantageous epibiosis with the giant bacteria Thiomargarita sp. to survive seasonal increases of sulfides in sediments

Abstract

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Variation in epibiotic bacteria on two squat lobster species of Munidopsidae

“…The difference in the relative abundance of ASV3 (order Thiotrichales ) among the epibiotic bacterial communities is striking. Thiotrichales , which are often involved in primary production in chemosynthetic communities ( Cambon-Bonavita et al, 2020 ), can exhibit sulfur-oxidizing activity in the presence of hydrogen sulfide and its spontaneously oxidized compounds and has been widely reported in the deep-sea research field, as sulfur-oxidizing symbionts of invertebrate hosts ( Hourdez et al, 2021 ). Dissolved sulfate and elemental sulfur are regarded as indicators of biochemical processes ( Feng et al, 2016 ).…”

Genetic diversification and life-cycle of the polychaete Capitella spp. from the English Channel: evidence for sympatric cryptic species and alternative reproductive strategies

“…Although partly explained by the demographic history of taxa since the Last Glacial Maximum, the superimposition of four distinct Capitella OTUs at the tip of Brittany may be also due to differences in ecological niches and lifehistory traits. Because some of them are involved in a mutualistic interaction with sulfo-oxidizing bacteria at small spatial scales, depending on local conditions of eutrophication (unpublished data) (Hourdez et al 2021), the second aim of the present work was to search for differences in the morphology and life-history traits of these worms that could explain their non-exclusive distributions. DNA sequence datasets provided thus a basis for further phylogeographic studies and population genetics within this species complex and a way of discriminating species to describe their life-history traits and reproductive dynamics.…”

On the need for integrating cancer into the One Health perspective

“…This work is deciphering the underlying tissue, cellular, and genomic mechanisms in cancer‐resistant/tolerant species (Abegglen et al, 2015 ; Keane et al, 2015 ; Sulak et al, 2016 ). Another particularly interesting direction of comparative oncology investigates the local evolution of adaptations in species or populations that have been living in environments with excesses of naturally occurring carcinogens (Hourdez et al, 2021 ; Vittecoq et al, 2018 ). To what extent do these populations show adaptations to prevent the emergence of cancer versus adaptations to mitigate the negative effects of cancer burdens?…”