Role of bacterial communities in the annual benthic community production and respiration of two contrasted intertidal sediments (Roscoff Aber Bay, France) - Archive ouverte HAL
Article Dans Une Revue Marine Ecology Progress Series Année : 2007

Role of bacterial communities in the annual benthic community production and respiration of two contrasted intertidal sediments (Roscoff Aber Bay, France)

Résumé

The role of the bacterial community in the annual benthic metabolism of Roscoff Aber Bay, France, was estimated during low tide at 2 sampling sites of different trophic status, located at either end of a strong environmental gradient. The benthic gross primary production (GPP) and community respiration (BCR) were assessed in situ over 1 yr with a benthic chamber; simultaneously, bacterial production (BP) was estimated by radiotracer incorporation in slurries. BP appeared to be significantly controlled by temperature during low tide. On an annual scale, microphytobenthos gross primary production (GPPa), bacterial production (BPa), meiofauna production (MePa), macrofauna production (MaPa) and benthic community respiration (BCRa) were estimated. While the estimated annual processes were generally higher at the muddy station, our results indicated that (1) the contribution of BPa to the annual benthic community production (CPa = BPa + MePa + MaPa) increased with increasing grain size, and (2) the bacterial community can modulate its growth efficiency (BGEa) when exposed to an environmental gradient: in intertidal sediments, the production of new cells is enhanced when the organic matter concentration is lower, sustaining the development of the community on the annual scale. This behaviour was inferred to be the predominant factor affecting the trophic state of the system.
Fichier principal
Vignette du fichier
m344p039.pdf (288.61 Ko) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-00481744 , version 1 (10-05-2021)

Licence

Identifiants

Citer

C. Hubas, Luis Felipe Artigas, Dominique Davoult. Role of bacterial communities in the annual benthic community production and respiration of two contrasted intertidal sediments (Roscoff Aber Bay, France). Marine Ecology Progress Series, 2007, 344, pp.39-48. ⟨10.3354/meps06947⟩. ⟨hal-00481744⟩
81 Consultations
33 Téléchargements

Altmetric

Partager

More