Skip to Main content Skip to Navigation
Journal articles

Microbial community production, respiration and structure of the microbial food web of an ecosystem in the northeastern Atlantic Ocean

Abstract : Gross community production (GCP), dark community respiration (DCR), and the biomass of the different size classes of organisms in the microbial community were measured in the northeastern Atlantic basin as part of the Programme Océan Multidisciplinaire Méso Echelle (POMME) project. The field experiment was conducted during three seasons (winter, spring, and late summer–fall) in 2001. Samples were collected from four different mesoscale structures within the upper 100 m. GCP rates increased from winter (101 ± 24 mmol O2 m−2 d−1) to spring (153 ± 27 mmol O2 m−2 d−1) and then decreased from spring to late summer (44 ± 18 mmol O2 m−2 d−1). DCR rates increased from winter (−47 ± 18 mmol O2 m−2 d−1) to spring (−97 ± 7 mmol O2 m−2 d−1) and then decreased from spring to late summer (50 ± 7 mmol O2 m−2 d−1). The onset of stratification depended on latitude as well as on the presence of mesoscale structures (eddies), and this largely contributed to the variability of GCP. The trophic status of the POMME area was defined as net autotrophic, with a mean annual net community production rate of +38 ± 18 mmol O2 m−2 d−1, exhibiting a seasonal variation from +2 ± 20 mmol O2 m−2 d−1 to +57 ± 20 mmol O2 m−2 d−1. This study highlights that small organisms (picoautotrophs, nanoautotrophs, and bacteria) are the main organisms contributing to biological fluxes throughout the year and that episodic blooms of microphytoplankton are related to mesoscale structures.
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-00092669
Contributor : Dominique Poirot Connect in order to contact the contributor
Submitted on : Thursday, February 18, 2021 - 10:00:41 AM
Last modification on : Thursday, December 23, 2021 - 9:46:14 AM
Long-term archiving on: : Wednesday, May 19, 2021 - 6:30:26 PM

File

Maixandeau et al 2005_JGR.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Anne Maixandeau, Dominique Lefèvre, Hera Karayanni, Urania Christaki, France van Wambeke, et al.. Microbial community production, respiration and structure of the microbial food web of an ecosystem in the northeastern Atlantic Ocean. Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2005, 110 (C7), pp.C07S17. ⟨10.1029/2004JC002694⟩. ⟨hal-00092669⟩

Share

Metrics

Record views

185

Files downloads

28