title: [Microbiological processes at the interface of aerobic and anaerobic waters in the deep-water zone of the Black Sea].
abstract: Chemical and key microbiological processes (assimilation of carbon dioxide, oxidation and formation of methane, and sulfate reduction) occurring at the boundary between the aerobic-anaerobic interface in the deep-water zone of the Black Sea were investigated. Measurements were taken at depths from 90 to 300 m at intervals of 5-10 m. The integral rate of the dark assimilation of carbon dioxide varied from 120 to 207 mg C/(m2 day) with a maximum at the boundary of cyclonic currents. The organic matter (OM) formed from methane comprised less than 5% of the OM formed from carbon dioxide. A comparison between the rates of methane oxidation and methane production suggests that methane that is oxidized at depths from 100 to 300 m was formed in deeper water horizons. The maximum rate of sulfate reduction (1230 mg S/(m2 day)) was observed in the western halistatic region, and the minimum rate (490 mg S/(m2 day)), in the eastern halistatic region. The average rate of hydrogen sulfide production measured at three deep-sea stations amounted to 755 mg S/(m2 day), or 276 g S/(m2 year).
authors.affiliation: Institute of Microbiology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: N V
authors.initials: NV
authors.lastname: Pimenov
authors.forename: I I
authors.initials: II
authors.lastname: Rusanov
authors.forename: S K
authors.initials: SK
authors.lastname: Iusupov
authors.forename: J
authors.initials: J
authors.lastname: Fridrich
authors.forename: A Iu
authors.initials: AIu
authors.lastname: Lein
authors.forename: B
authors.initials: B
authors.lastname: Wehrli
authors.forename: M V
authors.initials: MV
authors.lastname: Ivanov
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D001105:Archaea / Q000302:isolation & purification* / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism*; D001483:Base Sequence; D002245:Carbon Dioxide / Q000378:metabolism; D015169:Colony Count, Microbial; D017931:DNA Primers; D008697:Methane / Q000378:metabolism; D009792:Oceans and Seas; D010084:Oxidation-Reduction; D013431:Sulfates / Q000378:metabolism; D014871:Water Microbiology
chemical_list: D017931:DNA Primers; D013431:Sulfates; D002245:Carbon Dioxide; D008697:Methane