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Six antisera were prepared against 6 denitrifying bacteria isolated from Lake Kizaki (classified into 2 strains of the Pseudomonas fluorescent group, 2 of the Pseudomonas achromogenic group, 1 of the Pseudomonas group producing no acid and 1 of the Alcaligenes-Achromobacter group).Using both serological agglutinate reaction and immunofluorescent staining method, 60 isolates and 194 enrichment culture tubes for the MPN estimate of denitrifiers were tested for serological identity with each of the antigen denitrifiers. Fifteen strains among 60 isolates and denitrifiers in 25 tubes among 194 MPN counting tubes were identical to one or another of the 6 antigen denitrifiers. Seasonal and vertical distributions of these 40 identified denitrifying bacteria in the lake were described.Homologues of two strains of denitrifiers were most frequently found in L. Kizaki (68% or 27/40). One of them (Strain B-8, belonging to Pseudomonas fluorescent group) was found only in the circulation period or in the water layer where the dissolved oxygen concentration was about 10 mg·l-1. The other (Strain B-3, belonging to Pseudomonas achromogenic group) was found only in the stratification period or in the water layer where the dissolved oxygen concentration was above 5 mg·l-1.The fact that both homologues identical to B-3 or B-8 were found in oxic layers suggests that these denitrifiers might grow by aerobic respiration rather than denitrification because of the oxidative nature of their metabolism. However, from the standpoint of denitrifying activity, it is noteworthy that the only exception to the known distribution of these denitrifiers was found in the anoxic hypolimnion in November where many different denitrifiers were found.

Serological study on seasonal and vertical distribution of specific denitrifying bacteria in lake Kizaki.