Influence of subantarctic Macrocystis bed metabolism in diel changes of marine bacterioplankton and CO2 fluxes |
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Authors: | Delille Daniel; Marty Gilles; Cansemi-Soullard Maddy; Frankignoulle Michel |
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Institution: | Observatoire Océanologique de Banyuls, Université P. et M. Curie U.A. 117, Laboratoire Arago 66650 Banyuls sur mer
1Office de l'environnement de la Corse Projet de pare marin international des bouches de Bonifacio, 17 Bd du Roi Jérome, 20000 Ajaccio, France
2Université de Liége, Unité d'océanographie chimique, Mécanique des fluides géophysiques, Institut de Physique, B5, B-4000 Sart Tilman, Belgium |
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Abstract: | The significance of bacterial communities in the fluxes of carbonand energy in giant kelp beds (Macrocystis pyrifera) in KerguelenArchipelago, subantarctica, was estimated by measuring bacterioplanktonbiomass and production over diel cycles in surface seawaterslocated inside and outside of Macrocystis beds. Several physicochemicalparameters temperature, solar radiation, tide level, dissolvedoxygen, total inorganic carbon (TCO2), partial pressure of CO2(pCO2) and dissolved organic carbon (DOC)] were simultaneouslyrecorded in order to establish possible relationships with observedchanges in bacterial parameters. Bacterial biomass and productionwere significantly higher inside the kelp bed than in the surroundingarea. Furthermore, the results showed large and clear diel variationsof all parameters measured inside the kelp bed. Changes in dissolvedoxygen, TCO2 and pCO2 paralleled those of solar radiation, andwere obviously related to the metabolic activity of the kelp.Mean cell volumes and saprophytic bacterial abundance variedover the diel cycles in the same way as photosynthetic activity,while DOC, bacterioplankton production and the frequency ofdividing cells varied in an opposite way with maximal valuesat night-time. |
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