Heterotrophic bacteria in two canadian rivers—I. seasonal variations in the predominant bacterial populations

Bell, Colin; Holder-Franklin, M. A.; Franklin, M.

doi:10.1016/0043-1354(80)90209-2

Cited by 34 publications

(10 citation statements)

References 34 publications

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“…The waste disposal and land run-off are adversely affecting the ecology and characteristics of riverine microbiota such as aerobic heterotrophs, coliforms, fecal coliforms, enterococci, Aeromonas sp. and Vibrio sp., etc., which generally indicate the extent of riverine pollution (5,8,21,26). As rivers are one of the major sources of water directly or indirectly for human and animal consumption in various ways, riverine pollution has been considered to be a serious health risk.…”

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confidence: 99%

Seasonal variation in survival and antibiotic resistance among various bacterial populations in a tropical river.

Pathak

Bhattacherjee

Ray

1993

J. Gen. Appl. Microbiol.

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Seasonal variations in bacterial populations and their antibiotic sensitivity were surveyed in the water of the river Gomati at Lucknow. Most of the bacteria showed an increase in their densities in sewagecontaminated downstream of the river during summer. In contrast, Aeromonas sp. count was found to be higher in upstream during winter. Vibrio cholerae non-Ol was substantially found in downstream only. More than half of the bacterial isolates exhibited antibiotic resistance. The maximum resistance was shown by the winter isolates (36%), particularly from downstream (77.7%). Among the resistant isolates, resistance for ampicillin was predominant (42%), followed by tetracycline (40%). Single and multiple antibiotic resistances were the highest among 32% and 47% of aeromonads, respectively. The double resistance was exhibited to be maximum by the vbrio non-Ol isolates. Disposal of municipal sewage with fecal wastes seems to be mainly responsible for deterioration of water quality along with increased population of pathogenic and antibiotic resistant bacteria in river.Increasing industrialization, urbanization, agricultural and other human activities have caused enormous deterioration in quality of various natural water bodies, particularly rivers in developing countries like India. The waste disposal and land run-off are adversely affecting the ecology and characteristics of riverine microbiota such as aerobic heterotrophs, coliforms, fecal coliforms, enterococci, Aeromonas sp. and Vibrio sp., etc., which generally indicate the extent of riverine pollution (5,8,21,26). As rivers are one of the major sources of water directly or indirectly for human and animal consumption in various ways, riverine pollution has been considered to be a serious health risk.

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confidence: 99%

Seasonal variation in survival and antibiotic resistance among various bacterial populations in a tropical river.

Pathak

Bhattacherjee

Ray

1993

J. Gen. Appl. Microbiol.

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“…Although simultaneous examination of all possible physical, chemical, and biological parameters have not been made in this first study, in other studies, we have included an array of physical and chemical parameters (total, C, CO 2, total N, NO 3, NO2 NH4 +, Ca 2+, Na ÷, SO42-, C1,-, Fe 2÷, Mg 2+, dissolved 02,% saturation 02, specific conductance, total P, rainfall, sunlight, and chlorophyll a, and have not observed any obvious 6-week periodic change in these parameters, (Bell et al, 1980;Holder-Franklin, 1981). The increase in these heterotrophic bacteria as revealed by spectral analysis has introduced another phenomenon into the interpretation of changes in bacterial populations observed in samples from natural environments.…”

Section: Resultsmentioning

confidence: 99%

“…There was a long twilight in August in New Brunswick so it was difficult to pinpoint the maximum turnover in relation to light without a detailed monitoring of the sunlight (Bell et al, 1980(Bell et al, , 1982. Both of the rivers studied, the moderately polluted Meduxnekeag and the pristine Dunbar, are oligotrophic and the populations were limited by nitrogen.…”

Section: Introductionmentioning

confidence: 99%

River bacteria time series analysis: a field and laboratory study which demonstrates aquatic ecosystem health

Holder-Franklin

Franklin

1993

Journal of Aquatic Ecosystem Health

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Time series analysis of heterotrophic bacterial viable counts on agar plates incubated at 20 ° and 4°C from weekly river water samples for 1 year has revealed a periodicity of 6 to 7 weeks in the total numbers. A cycle of increase and decrease in the counts which could not be attributed to season, river water temperature, pH, and flow rate has been observed in the heterotrophic bacteria which were isolated from river water samples. Spectral analysis has demonstrated a hidden periodicity in population increase and decrease which could not be detected by examination of the raw count data. Fluctuations with periodicity could imply that this is the expected behaviour in a well-balanced ecosystem.Pseudomonas fluorescens, the predominant species isolated from a river water sample which was at 0°C at the time of sampling, utilized two different pathways at 5 ° and 30°C. In addition, 2-ketogluconate, a product of the utilization of glucose, was utilized by the same organism. Fluctuations in enzymic responses could contribute to the overall periodicity in bacterial numbers. The flexibility in bacterial metabolism would serve to maintain P. fluorescens in the predominant flora. A feature which sustains health in this ecosystem, P. fluorescens, is one of the most successful of all biodegraders in the aquatic system.

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“…These organisms comprise a significant portion of the microflora associated with fish (ALLEN et al 1983, TRUST and SPANOV 1974, GILMOUR et al 1976, LIPTON and LAKSHMANAN 1986 and can cause disease in cold-blooded animals, as well as in humans (LJUNGH et al 1977, VON GRAEVENITZ and MENSCH 1968). In addition, these organisms have been proposed as indicators of pollution and the trophic state of bodies of water ( RIPPEY and CABELLI 1980, BELL et al 1980, SCHUBERT 1976.…”

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confidence: 97%

“…Despite extensive studies carried out to elucidate the ecology and taxonomy of these bacteria, the systematics of Aeromonas remains unsettled (LJUNGH et al 1977). The genus Aeromonas has recently been placed in the family Aeromonadaceae (COLWELL et al 1986), and four species are recognized in BERGEY'S Manual of Systematic Bacteriology. Aeromonas salmonicida includes non-motile strains which fail to grow at 37 "C; and motile mesophilic species comprise A .…”

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Aeromonas hydrophila: Variability in biochemical characteristics of environmental isolates

Okpokwasili

1991

J. Basic Microbiol.

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A total of 161 strains, including 144 aeromonads, of which 100 had been isolated from water and sediment samples from the Chesapeake Bay, five clinical and 33 Anacostia River isolates of Aeromonas hydrophila, six Aeromonas sobria, and ten reference cultures were examined in a numerical taxonomy study in which each of the strains were examined for 56 unit characters. Similarity between strains was computed using the simple matching (SSM) and Jaccard (SJ) coefficients. The strains were clustered by unweighted average linkage and single linkage algorithms. Results of all analyses yielded similar clusterings of strains. Of the 161 strains included in the study, 148 were recovered in seven major clusters. A large cluster of Aeromonas hydrophila yielded two sub-clusters. From the results of the taxonomic analysis it is concluded that several biovars of Aeromonas hydrophila can be isolated from the aquatic environment, but geographical or site specific distribution of the biovars could not be detected.

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Heterotrophic bacteria in two canadian rivers—I. seasonal variations in the predominant bacterial populations

Cited by 34 publications

References 34 publications

Seasonal variation in survival and antibiotic resistance among various bacterial populations in a tropical river.

Seasonal variation in survival and antibiotic resistance among various bacterial populations in a tropical river.

River bacteria time series analysis: a field and laboratory study which demonstrates aquatic ecosystem health

Aeromonas hydrophila: Variability in biochemical characteristics of environmental isolates

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