Zaghmouri I. auteur aut IRD Michotey V. D. auteur aut IRD Armougom Fabrice auteur aut IRD Guasco S. auteur aut IRD Bonin P. C. auteur aut IRD text journalArticle eng text/pdf born digital access The sensitivity of denitrifying community to salinity fluctuations was studied in microcosms filled with marine coastal sediments subjected to different salinity disturbances over time (sediment under frequent salinity changes vs sediment with "stable" salinity pattern). Upon short-term salinity shift, denitrification rate and denitrifiers abundance showed high resistance whatever the sediment origin is. Denitrifying community adapted to frequent salinity changes showed high resistance when salinity increases, with a dynamic nosZ relative expression level. Marine sediment denitrifying community, characterized by more stable pattern, was less resistant when salinity decreases. However, after two successive variations of salinity, it shifted toward the characteristic community of fluctuating conditions, with larger proportion of Pseudomonas-nosZ, exhibiting an increase of nosZ relative expression level. The impact of long-term salinity variation upon bacterial community was confirmed at ribosomal level with a higher percentage of Pseudomonas and lower proportion of nosZII Glade genera. specialized Salinity fluctuations Microcosm Denitrification Resistance Community shift Pseudomonas FRANCE MEDITERRANEE 036 064 084 130 76-83 2018 0025-326X https://www.documentation.ird.fr/hor/fdi:010073198 10.1016/j.marpolbul.2018.03.020 0025-326X [F B010073198] https://www.documentation.ird.fr/hor/fdi:010073198 https://www.documentation.ird.fr/intranet/publi/2018/07/010073198.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2018-09-03 2023-07-11 fdi:010073198 fre