Bacterial Carbon Demand and Primary Production in a Posidonia oceanica System: A Re-Evaluation of Carbon Fluxes
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2025 |
| Auteurs (2) | : | VELIMIROV B WEINBAUER Markus,g |
| Revue scientifique | : | Journal of Marine Science and Engineering |
| Volume | : | 13 |
| Fascicule | : | 2 |
| Pages | : | |
| DOI | : | 10.3390/jmse13020314 |
| URL | : | https://www.mdpi.com/2077-1312/13/2/314 |
| Abstract | : | An earlier ecosystemic study on carbon balance calculations of a Posidonia oceanica system in the Bay of Calvi [Corsica, France], indicated that the bacterial carbon demand [BCD] between May and October [Temp > 18 °C] in the seagrass meadow could not be sustained by net leaf production of P. oceanica and its epiphytes [NPP]. Hence, the system was clearly heterotrophic as only one autotrophic region was recorded, namely the depth range from 0–10 m. Already published data on the production of algal macrophytes and Cymodocea nodosa meadows and their mapping in the Bay of Calvi allowed a re-evaluation of the carbon budgets for each specific depth range. It was shown that C. nodosa could contribute significantly to covering the bacterial carbon demand of the P. oceanica system and that a positive carbon balance could be obtained for the seagrass meadow due to this carbon input when the temperature was higher than 18 °C, even though the depth ranges between 21–30 m and 31–38 m were negative. The overall trend indicates that the system cannot rely on the phytoplanktonic production of the water column, as BCD is higher than phytoplanktonic carbon production. When integrating BCD and net primary production [NPP] of the water column in summer we noticed a lack of some 97.6 to 104.3 tons of carbon which is not covered by the seagrasses leaf production and the algal macrophytes. The obtained data indicate clearly that other carbon carbon-producing compartments like the microphytobenthos, the NPP of rhizome epiphytes, and the detrital carbon import into the Bay of Calvi need to be investigated. |
| Mots-clés | : | bacterial carbon demand; carbon fluxes; Cymodocea nodosa; macroalgae; Posidonia oceanica system; primary production |
| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Velimirov B, Weinbauer MG (2025) Bacterial Carbon Demand and Primary Production in a Posidonia oceanica System: A Re-Evaluation of Carbon Fluxes. J Mar Sci Eng 13 | doi: 10.3390/jmse13020314
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