Shift from denitrification to anammox after inflow events in the central Baltic Sea

Hannig, Michael; Lavik, Gaute; Kuypers, Marcel M. M.; Woebken, Dagmar; Martens‐Habbena, Willm; Jürgens, Klaus

doi:10.4319/lo.2007.52.4.1336

Cited by 110 publications

(132 citation statements)

References 40 publications

(46 reference statements)

Supporting

Mentioning

120

Contrasting

Order By: Relevance

“…While our knowledge of the spatial distribution and magnitude of carbon fixation in the oxygenated dark realm, comprising ca. 75% of the global ocean's volume, is rather rudimentary, inorganic carbon fixation in oxygen minimum zones has received far more attention, although it comprises only 0.1% of the ocean's volume (Taylor et al 2001, Hannig et al 2007, Lam et al 2007). …”

Section: Deep Ocean Chemoautotrophy As a Source Of Carbon And Energy mentioning

confidence: 99%

“…Pelagic prokaryotic chemoautotrophy increases with decreasing oxygen concentrations in the water column (Taylor et al 2001, Hannig et al 2007, Lam et al 2007). Consequently, highest pelagic prokaryotic carbon fixation rates have been reported for suboxic and anoxic water bodies such as the Black Sea, the Cariaco Basin and the twilight zones of upwelling areas (Taylor et al 2001, Kuypers et al 2005, Hamersley et al 2007.…”

Section: Deep Ocean Chemoautotrophy As a Source Of Carbon And Energy mentioning

confidence: 99%

See 1 more Smart Citation

Towards a better understanding of microbial carbon flux in the sea*

Gasol¹,

Pinhassi²,

Alonso‐Sáez³

et al. 2008

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

We now have a relatively good idea of how bulk microbial processes shape the cycling of organic matter and nutrients in the sea. The advent of the molecular biology era in microbial ecology has resulted in advanced knowledge about the diversity of marine microorganisms, suggesting that we might have reached a high level of understanding of carbon fluxes in the oceans. However, it is becoming increasingly clear that there are large gaps in the understanding of the role of bacteria in regulating carbon fluxes. These gaps may result from methodological as well as conceptual limitations. For example, should bacterial production be measured in the light? Can bacterial production conversion factors be predicted, and how are they affected by loss of tracers through respiration? Is it true that respiration is relatively constant compared to production? How can accurate measures of bacterial growth efficiency be obtained? In this paper, we discuss whether such questions could (or should) be addressed. Ongoing genome analyses are rapidly widening our understanding of possible metabolic pathways and cellular adaptations used by marine bacteria in their quest for resources and struggle for survival (e.g. utilization of light, acquisition of nutrients, predator avoidance, etc.). Further, analyses of the identity of bacteria using molecular markers (e.g. subgroups of Bacteria and Archaea) combined with activity tracers might bring knowledge to a higher level. Since bacterial growth (and thereby consumption of DOC and inorganic nutrients) is likely regulated differently in different bacteria, it will be critical to learn about the life strategies of the key bacterial species to achieve a comprehensive understanding of bacterial regulation of C fluxes. Finally, some processes known to occur in the microbial food web are hardly ever characterized and are not represented in current food web models. We discuss these issues and offer specific comments and advice for future research agendas.

show abstract

Section: Deep Ocean Chemoautotrophy As a Source Of Carbon And Energy mentioning

confidence: 99%

Section: Deep Ocean Chemoautotrophy As a Source Of Carbon And Energy mentioning

confidence: 99%

Towards a better understanding of microbial carbon flux in the sea*

Gasol¹,

Pinhassi²,

Alonso‐Sáez³

et al. 2008

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

show abstract

“…Nitrogen transformations and the responsible microorganisms have also been investigated in the oxic-anoxic transition zones of the water column of the central Baltic Sea (Hannig et al, 2007;Schneider et al, 2010;Hietanen et al, 2012). Oxygen depletion in deep basins is accompanied by gradients of NO 3 À , NO 2 À , H 2 S and NH 4 þ that are exploited by different guilds of chemolithoautotrophic prokaryotes (Grote et al, 2008;Labrenz et al, 2010;Glaubitz et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Autotrophic ammonia oxidation is an essential ecological function for the N and C cycle in the Baltic Sea that receives high loads of nutrient input from its catchment area (Voss et al, 2011). Nitrification fuels subsequent denitrification that in the water column is mainly carried out by chemolithoautotrophic prokaryotes that link the latter process to the oxidation of reduced sulfur compounds (Brettar and Rheinheimer, 1991;Hannig et al, 2007;Dalsgaard et al, 2013). Anaerobic ammonia oxidation (anammox) has been shown to occur periodically upon major inflow events of oxygen-rich water, causing temporary nonsulfidic conditions (Hannig et al, 2007) in Baltic deep basins.…”

Section: Introductionmentioning

confidence: 99%

Significance of archaeal nitrification in hypoxic waters of the Baltic Sea

et al. 2014

View full text Add to dashboard Cite

Ammonia-oxidizing archaea (AOA) of the phylum Thaumarchaeota are widespread, and their abundance in many terrestrial and aquatic ecosystems suggests a prominent role in nitrification. AOA also occur in high numbers in oxygen-deficient marine environments, such as the pelagic redox gradients of the central Baltic Sea; however, data on archaeal nitrification rates are scarce and little is known about the factors, for example sulfide, that regulate nitrification in this system. In the present work, we assessed the contribution of AOA to ammonia oxidation rates in Baltic deep basins and elucidated the impact of sulfide on this process. Rate measurements with 15 N-labeled ammonium, CO 2 dark fixation measurements and quantification of AOA by catalyzed reporter deposition-fluorescence in situ hybridization revealed that among the three investigated sites the highest potential nitrification rates (122-884 nmol l À 1 per day) were measured within gradients of decreasing oxygen, where thaumarchaeotal abundance was maximal (2.5-6.9 Â 10 5 cells per ml) and CO 2 fixation elevated. In the presence of the archaeal-specific inhibitor GC 7 , nitrification was reduced by 86-100%, confirming the assumed dominance of AOA in this process. In samples spiked with sulfide at concentrations similar to those of in situ conditions, nitrification activity was inhibited but persisted at reduced rates. This result together with the substantial nitrification potential detected in sulfidic waters suggests the tolerance of AOA to periodic mixing of anoxic and sulfidic waters. It begs the question of whether the globally distributed Thaumarchaeota respond similarly in other stratified water columns or whether the observed robustness against sulfide is a specific feature of the thaumarchaeotal subcluster present in the Baltic Deeps.

show abstract

“…Most of the studies on denitrification focused on the pelagic redoxcline. Incubation experiments have been used to determine denitrification rates (Rönner and Sörensen 1985;Rheinheimer 1991, 1992;Hannig et al 2007), which, however, did not allow an estimate of the large-scale effect of denitrification on the Baltic Sea DIN budget. Other studies used measurements of the N 2 production in order to quantify the effect of denitrification (Rönner and Sörensen 1985;Löffler et al 2011).…”

Section: Nitrogen Transformationsmentioning

confidence: 99%

Environmental Impacts—Marine Biogeochemistry

Schneider

Eilola

Lukkari

et al. 2015

Regional Climate Studies

View full text Add to dashboard Cite

Marine biogeochemistry deals with the budgets and transformations of biogeochemically reactive elements such as carbon, nitrogen and phosphorus. Inorganic nitrogen and phosphorus compounds are the major nutrients and control organic matter (biomass) production in the surface water. Due to various anthropogenic activities, the input of these nutrients into the Baltic Sea has increased drastically during the last century and has enhanced the net organic matter production by a factor of 2-4 (eutrophication). This has led to detrimental oxygen depletion and hydrogen sulphide production in the deep basins of the Baltic Sea. Model simulations based on the Baltic Sea Action Plan (BSAP) indicate that current eutrophication and thus extension of oxygen-depleted areas cannot be reversed within the next hundred years by the proposed nutrient reduction measures. Another environmental problem is related to decreasing pH (acidification) that is caused by dissolution of the rising atmospheric CO 2 . Estimates indicate a decrease in pH by about 0.15 during the last 1-2 centuries, and continuation of this trend may have serious ecological consequences. However, the concurrent increase in the alkalinity of the Baltic Sea may have significantly counteracted acidification.

show abstract

Shift from denitrification to anammox after inflow events in the central Baltic Sea

Cited by 110 publications

References 40 publications

Towards a better understanding of microbial carbon flux in the sea*

Towards a better understanding of microbial carbon flux in the sea*

Significance of archaeal nitrification in hypoxic waters of the Baltic Sea

Environmental Impacts—Marine Biogeochemistry

Contact Info

Product

Resources

About