Deep microbial communities evidenced in the Liguro-Provençal front by their ETS activity

Savenkoff, Claude; Prieur, Louis; Reys, J. P.; Lefèvre, D.; Dallot, S.; Denis, Michel

doi:10.1016/0967-0637(93)90067-d

Cited by 27 publications

(10 citation statements)

References 22 publications

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“…the tropical Pacific (Packard et al 1975, King et al 1978 and aphotic deep layers (Packard & Williams 1981, Savenkoff et al 1993. They were also similar to the values we obtained for other oligotrophic coastal areas of the Balearics (Sintes 2002).…”

Section: Comparison Between Microbial Communities In Cave Lagoons Andsupporting

confidence: 76%

Dissecting the microbial food web: structure and function in the absence of autotrophs

Sintes¹,

Martínez-Taberner²,

Moyà³

et al. 2004

Aquat. Microb. Ecol.

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Section: Comparison Between Microbial Communities In Cave Lagoons Andsupporting

confidence: 76%

Dissecting the microbial food web: structure and function in the absence of autotrophs

Sintes¹,

Martínez-Taberner²,

Moyà³

et al. 2004

Aquat. Microb. Ecol.

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“…[] in the WMS yield an equivalent O 2 respiration rate for the 500–3500 m depth range on the order of 0.6 µM O 2 yr −1 , which is close to the value of 0.71 µM O 2 yr −1 we derive for the WMDW. Similarly, our modeled WMIW rate of 2.2 µM O 2 yr −1 falls in the range for the 110–1000 m depth interval (1.4–5.5 µM O 2 yr −1 ) inferred from ETS activity measurements [ Savenkoff et al ., ; Lefèvre et al ., ; Tanaka and Rassoulzadegan , ]. Using a mass balance approach, Roether and Well [] derived an O 2 consumption rate of 0.55 µM O 2 yr −1 for the EMS below 1000 m, compared to our EMDW value of 0.29 µM O 2 yr −1 .…”

Section: Resultsmentioning

confidence: 81%

“…Per unit volume, the baseline O 2 consumption rates are greater in WMDW than in EMDW, but lower in WMIW than EMIW despite the higher primary productivity in the WMS compared with the EMS [Antoine et al, 1995]. A higher influx of labile and semilabile DOC into the WMDW [Santinelli, 2015], which enhances heterotrophic respiration in the DWs of the WMS [Luna et al, 2012], helps explain the 2.5 times larger O 2 consumption rate in WMDW (0.71 mM yr 21 ; [Savenkoff et al, 1993;Lefèvre et al, 1996;Tanaka and Rassoulzadegan, 2004]. Using a mass balance approach, Roether and Well [2001] Figure 3A).…”

Section: Resultsmentioning

confidence: 99%

Circulation and oxygen cycling in the Mediterranean Sea: Sensitivity to future climate change

Powley

Krom

Cappellen

2016

J. Geophys. Res. Oceans

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Climate change is expected to increase temperatures and decrease precipitation in the Mediterranean Sea (MS) basin, causing substantial changes in the thermohaline circulation (THC) of both the Western Mediterranean Sea (WMS) and Eastern Mediterranean Sea (EMS). The exact nature of future circulation changes remains highly uncertain, however, with forecasts varying from a weakening to a strengthening of the THC. Here we assess the sensitivity of dissolved oxygen (O2) distributions in the WMS and EMS to THC changes using a mass balance model, which represents the exchanges of O2 between surface, intermediate, and deep water reservoirs, and through the Straits of Sicily and Gibraltar. Perturbations spanning the ranges in O2 solubility, aerobic respiration kinetics, and THC changes projected for the year 2100 are imposed to the O2 model. In all scenarios tested, the entire MS remains fully oxygenated after 100 years; depending on the THC regime, average deep water O2 concentrations fall in the ranges 151–205 and 160–219 µM in the WMS and EMS, respectively. On longer timescales (>1000 years), the scenario with the largest (>74%) decline in deep water formation rate leads to deep water hypoxia in the EMS but, even then, the WMS deep water remains oxygenated. In addition, a weakening of THC may result in a negative feedback on O2 consumption as supply of labile dissolved organic carbon to deep water decreases. Thus, it appears unlikely that climate‐driven changes in THC will cause severe O2 depletion of the deep water masses of the MS in the foreseeable future.

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“…Given that diatoms are typical of well-mixed, nutrient-rich environments [63,70], our results showed that coastal waters of Bastia (S2) were not always as well mixed as would be expected for Calvi and the Northwestern Mediterranean littoral zone [71,72]. Indeed, at S1, the winter-spring period corresponded to vertical thermocline movement under the influence of local wind-driven upwelling events, and the injection of nutrients through across-thermocline mixing induced by the Liguro-Provenç al front [73,74]. In February, nutrient concentrations are highest, while the nutrient levels show a strong decrease in April from the previous month, combined with the spring phytoplankton bloom.…”

Section: Discussion-conclusionmentioning

confidence: 93%

Contrasting Patterns of Phytoplankton Assemblages in Two Coastal Ecosystems in Relation to Environmental Factors (Corsica, NW Mediterranean Sea)

et al. 2014

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Corsica Island is a sub-basin of the Northwestern Mediterranean Sea, with hydrological features typical of both oligotrophic systems and eutrophic coastal zones. Phytoplankton assemblages in two coastal ecosystems of Corsica (the deep Bay of Calvi and the shallow littoral of Bastia) show contrasting patterns over a one-year cycle. In order to determine what drives these variations, seasonal changes in littoral phytoplankton are considered together with environmental parameters. Our methodology combined a survey of the physico-chemical structure of the subsurface water with a characterization of the phytoplankton community structure. Sampling provided a detailed record of the seasonal changes and successions that occur in these two areas. Results showed that the two sampled stations presented different phytoplankton abundance and distribution patterns, notably during the winter-spring bloom period. Successions in pico-, nano-, and microphytoplankton communities appeared mainly driven by differences in the ability to acquire nutrients, and in community-specific growth rates. Phytoplankton structure and dynamics are discussed in relation to available data on the Northwestern Mediterranean OPEN ACCESS Diversity 2014, 6 297 Sea. These results confirm that integrated monitoring of coastal areas is a requisite for gaining a proper understanding of marine ecosystems.

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Deep microbial communities evidenced in the Liguro-Provençal front by their ETS activity

Cited by 27 publications

References 22 publications

Dissecting the microbial food web: structure and function in the absence of autotrophs

Dissecting the microbial food web: structure and function in the absence of autotrophs

Circulation and oxygen cycling in the Mediterranean Sea: Sensitivity to future climate change

Contrasting Patterns of Phytoplankton Assemblages in Two Coastal Ecosystems in Relation to Environmental Factors (Corsica, NW Mediterranean Sea)

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