@article{fdi:010079826, title = {{C}hanges in bacterial diversity, composition and interactions during the development of the seabird tick {O}rnithodoros maritimus ({A}rgasidae)}, author = {{G}omard, {Y}. and {F}lores, {O}. and {V}ittecoq, {M}. and {B}lanchon, {T}. and {T}oty, {C}{\'e}line and {D}uron, {O}. and {M}avingui, {P}. and {T}ortosa, {P}. and {M}c{C}oy, {K}. {D}.}, editor = {}, language = {{ENG}}, abstract = {{C}haracterising within-host microbial interactions is essential to understand the drivers that shape these interactions and their consequences for host ecology and evolution. {H}ere, we examined the bacterial microbiota hosted by the seabird soft tick{O}rnithodoros maritimus({A}rgasidae) in order to uncover bacterial interactions within ticks and how these interactions change over tick development. {B}acterial communities were characterised through next-generation sequencing of the {V}3-{V}4 hypervariable region of the bacterial 16{S} ribosomal {RNA} gene. {B}acterial co-occurrence and co-exclusion were determined by analysing networks generated from the metagenomic data obtained at each life stage. {O}verall, the microbiota of{O}. maritimuswas dominated by four bacterial genera, namely{C}oxiella,{R}ickettsia,{B}revibacteriumand{A}rsenophonus, representing almost 60% of the reads. {B}acterial diversity increased over tick development, and adult male ticks showed higher diversity than did adult female ticks. {B}acterial networks showed that co-occurrence was more frequent than co-exclusion and highlighted substantial shifts across tick life stages; interaction networks changed from one stage to the next with a steady increase in the number of interactions through development. {A}lthough many bacterial interactions appeared unstable across life stages, some were maintained throughout development and were found in both sexes, such as{C}oxiellaand{A}rsenophonus.{O}ur data support the existence of a few stable interactions in{O}. maritimusticks, on top of which bacterial taxa accumulate from hosts and/or the environment during development. {W}e propose that stable associations delineate core microbial interactions, which are likely to be responsible for key biological functions.}, keywords = {{O}rnithodoros maritimus ; {B}acterial interactions ; {N}etwork analyses ; 16{S} ; r{RNA} gene}, booktitle = {}, journal = {{M}icrobial {E}cology}, volume = {81}, numero = {3}, pages = {770--783}, ISSN = {0095-3628}, year = {2021}, DOI = {10.1007/s00248-020-01611-9}, URL = {https://www.documentation.ird.fr/hor/fdi:010079826}, }