Ocean acidification shows negligible impacts on high-latitude bacterial community structure in coastal pelagic mesocosms - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Biogeosciences Année : 2013

Ocean acidification shows negligible impacts on high-latitude bacterial community structure in coastal pelagic mesocosms

Résumé

The impact of ocean acidification and carbonation on microbial community structure was assessed during a large-scale in situ costal pelagic mesocosm study, included as part of the EPOCA 2010 Arctic campaign. The mesocosm experiment included ambient conditions (fjord) and nine mesocosms with pCO(2) levels ranging from similar to 145 to similar to 1420 mu atm. Samples for the present study were collected at ten time points (t-1, t1, t5, t7, t12, t14, t18, t22, t26 to t28) in seven treatments (ambient fjord (similar to 145), 2x similar to 185, similar to 270, similar to 685, similar to 820, similar to 1050 mu atm) and were analysed for ``small'' and ``large'' size fraction microbial community composition using 16S rRNA (ribosomal ribonucleic acid) amplicon sequencing. This high-throughput sequencing analysis produced similar to 20 000 000 16S rRNA V4 reads, which comprised 7000OTUs. The main variables structuring these communities were sample origins (fjord or mesocosms) and the community size fraction (small or large size fraction). The community was significantly different between the unenclosed fjord water and enclosed mesocosms (both control and elevated CO2 treatments) after nutrients were added to the mesocosms, suggesting that the addition of nutrients is the primary driver of the change in mesocosm community structure. The relative importance of each structuring variable depended greatly on the time at which the community was sampled in relation to the phytoplankton bloom. The sampling strategy of separating the small and large size fraction was the second most important factor for community structure. When the small and large size fraction bacteria were analysed separately at different time points, the only taxon pCO(2) was found to significantly affect were the Gammaproteobacteria after nutrient addition. Finally, pCO(2) treatment was found to be significantly correlated (non-linear) with 15 rare taxa, most of which increased in abundance with higher CO2.
Fichier principal
Vignette du fichier
bg-10-555-2013.pdf (2.97 Mo) Télécharger le fichier
Origine : Publication financée par une institution
Loading...

Dates et versions

hal-01258227 , version 1 (19-01-2016)

Licence

Paternité

Identifiants

Citer

A. -S. Roy, S. M. Gibbons, H. Schunck, S. Owens, J. G. Caporaso, et al.. Ocean acidification shows negligible impacts on high-latitude bacterial community structure in coastal pelagic mesocosms. Biogeosciences, 2013, 10 (1), pp.555-566. ⟨10.5194/bg-10-555-2013⟩. ⟨hal-01258227⟩
481 Consultations
164 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More