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| Pulsed remineralisation in the northwestern Mediterranean Sea: a hypothesis Denis, M.; Martin, V.; Momzikoff, A.; Gondry, G.; Stemmann, L.; Demers, S.; Gorsky, G.; Andersen, V. (2003). Pulsed remineralisation in the northwestern Mediterranean Sea: a hypothesis. J. Mar. Syst. 39(1-2): 19-41. https://dx.doi.org/10.1016/S0924-7963(02)00244-0
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, meer
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Biological phenomena Colloids Particulates > Suspended particulate matter Respiration Mediterranean [Marine Regions] Marien/Kust |
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| Abstract |
Although all distributions exhibited a periodic behaviour, AACC distributions were generally not linked to diel vertical migrations. In the subsurface layer, Synechococcus made the most abundant population and large variations in concentration were observed both at day and at night. The corresponding integrated (over the upper 90 m) losses of Synechococcus during one night pointed to a potential source of exported organic matter amounting to 534 mg C m−2. This study stresses the potential importance of organic matter export from the euphotic zone through the daily grazing activity of vertically migrating organisms, which would not be accounted for by measurements at longer time scales. The metabolic CO2 production exhibited a peak of activity below 500 m that was shifted downward, apparently in a recurrent way and independently of the vertical distributions of AACC or of suspended particulate material. To account for this phenomenon, a «sustained wave train» hypothesis is proposed that combines the effect of the diel superficial faecal pellet production by swarming migrators and the repackaging activity of the nonmigrating midwater populations. Our results confirm the recent finding that the particulate compartment is not the major source of the observed instantaneous remineralisation rate and shed a new light on the fate of organic matter in the aphotic zone. |
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