@article{fdi:010063734, title = {{C}ompetition and facilitation between the marine nitrogen-fixing cyanobacteriunn {C}yanothece and its associated bacterial community}, author = {{B}rauer, {V}. {S}. and {S}tomp, {M}. and {B}ouvier, {T}. and {F}ouilland, {E}. and {L}eboulanger, {C}hristophe and {C}onfurius-{G}uns, {V}. and {W}eissing, {F}. {J}. and {S}tal, {L}. {J}. and {H}uisman, {J}.}, editor = {}, language = {{ENG}}, abstract = {{N}-2-fixing cyanobacteria represent a major source of new nitrogen and carbon for marine microbial communities, but little is known about their ecological interactions with associated microbiota. {I}n this study we investigated the interactions between the unicellular {N}-2-fixing cyanobacterium {C}yanothece sp. {M}iami {BG}043511 and its associated free-living chemotrophic bacteria at different concentrations of nitrate and dissolved organic carbon and different temperatures. {H}igh temperature strongly stimulated the growth of {C}yanothece, but had less effect on the growth and community composition of the chemotrophic bacteria. {C}onversely, nitrate and carbon addition did not significantly increase the abundance of {C}yanothece, but strongly affected the abundance and species composition of the associated chemotrophic bacteria. {I}n nitrate-free medium the associated bacterial community was co-dominated by the putative diazotroph {M}esorhizobium and the putative aerobic anoxygenic phototroph {E}rythrobacter and after addition of organic carbon also by the {F}lavobacterium {M}uricauda. {A}ddition of nitrate shifted the composition toward co-dominance by {E}rythrobacter and the {G}ammaproteobacterium {M}arinobacter. {O}ur results indicate that {C}yanothece modified the species composition of its associated bacteria through a combination of competition and facilitation. {F}urthermore, within the bacterial community, niche differentiation appeared to play an important role, contributing to the coexistence of a variety of different functional groups. {A}n important implication of these findings is that changes in nitrogen and carbon availability due to, e.g., eutrophication and climate change are likely to have a major impact on the species composition of the bacterial community associated with {N}-2-fixing cyanobacteria.}, keywords = {aerobic anoxygenic phototrophs ; cyanobacteria ; heterotrophic bacteria ; microbiota ; nitrogen fixation ; phytoplankton ; resource competition ; species interactions}, booktitle = {}, journal = {{F}rontiers in {M}icrobiology}, volume = {5}, numero = {}, pages = {795 [14 ]}, ISSN = {1664-302{X}}, year = {2015}, DOI = {10.3389/fmicb.2014.00795}, URL = {https://www.documentation.ird.fr/hor/fdi:010063734}, }