Skip to Main content Skip to Navigation
New interface
Journal articles

Benthic metabolism in shallow coastal ecosystems of the Banc d'Arguin, Mauritania

Abstract : Benthic primary production and respiration were investigated at 4 sites representative of the major coastal communities bordering the Sahara Desert in the Banc d'Arguin, Mauritania, Western Africa. These sites correspond to intertidal Zostera noltii beds (270 km(2)), intertidal bare sediments (88 km(2)), subtidal Cymodocea nodosa beds (374 km(2)), and subtidal bare sediments (311 km(2)). At each site, production-irradiance relationships were established in situ in November 2008 and January 2010, and used to calculate daily carbon fluxes for these communities. In intertidal areas, compared to emersion, the gross maximal photosynthetic rates for Z. noltii bed and bare sediment communities were on average 8-and 7-fold higher during immersion, respectively; community respiration rates were 3-and 18-fold higher during immersion, respectively. The Z. noltii bed was autotrophic during the 2 study periods, with a mean (+/- 95% probability limit) daily net community production of 71.3 +/- 58.6 mmol C m(-2) d(-1). Conversely, net community production was always negative in intertidal regions and subtidal bare sediments (average -7.3 +/- 46.7 mmol C m(-2) d(-1) and -47.0 +/- 38.9 mmol C m(-2) d(-1), respectively); the C. nodosa bed was negative in November (-96.2 +/- 85.1 mmol C m(-2) d(-1)) and positive in January (33.4 +/- 82.6 mmol C m(-2) d(-1)). Community respiration was highest in subtidal communities, indicating active mineralization of organic matter and demonstrating that Z. noltii beds are likely to increase the bio logical richness of the Banc d'Arguin by exporting energy. Our results confirm the ecological importance of seagrass beds in the net coastal carbon fluxes and justify their protection.
Complete list of metadata

https://hal.univ-brest.fr/hal-01024487
Contributor : AdminHAL UnivBrestBU Connect in order to contact the contributor
Submitted on : Tuesday, September 7, 2021 - 11:28:54 AM
Last modification on : Tuesday, May 10, 2022 - 3:25:43 PM
Long-term archiving on: : Wednesday, December 8, 2021 - 7:04:32 PM

File

m501p011.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Jacques Clavier, Laurent Chauvaud, Erwan Amice, Pascal Lazure, Matthijs van Der Geest, et al.. Benthic metabolism in shallow coastal ecosystems of the Banc d'Arguin, Mauritania. Marine Ecology Progress Series, 2014, 501, pp.11-23. ⟨10.3354/meps10683⟩. ⟨hal-01024487⟩

Share

Metrics

Record views

182

Files downloads

21