Physiological and Biochemical Aspects of Marine Bacteria

Wiebe, W. J.

doi:10.1007/978-1-4684-9010-7_3

Cited by 5 publications

(8 citation statements)

References 84 publications

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“…This pattern is confirmed by the significant correlation coefficient between BP and BA in the case of the < l-pm fraction only (r = 0.60; P < 0.001) and by its choice first in the stepwise regression. A lack of correlation between BP and BA has been mentioned before (Hobbie 1979;Letarte and Pinel-Alloul 199 la) and could be associated with bacterioplankton cells adapted to poor nutrient conditions, slow renewal (Wiebe 1984), accumulating substrates (Gemerden and Kuenen 1984), and using several substrates. In fact, several studies showed more variation in BP than in BA (Hobbie 1979;Jeffrey and Paul 1986;Letarte and Pinel-Alloul 1991a), and the role of the aquatic bacteria is said to be nutrient regeneration rather than biomass synthesis as a food for other organisms.…”

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confidence: 82%

“…The aim was to separate relatively large bacteria from small ones. Most of the small bacteria could be in a reduced form (Wiebe 1984) and are often relatively abundant (Hessen 1985;Letarte and PinelAlloul 199 la), but may arise from starvation. If so for a significant number of cells, large bacteria could represent well-adapted organisms that can use substrates that are relatively abundant in the water and that are different from those used by reduced cells.…”

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confidence: 99%

“…Further, reduced dimensions are said to be an adaptive mechanism of bacteria under starvation: rods, cocci, and vibrios can all be reduced to small, spherical cells (Wiebe 1984). Miniature bacteria can be obtained experimentally by starvation in culture (Hood and MacDonelll987) which implies morphological and physiological modifications.…”

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confidence: 99%

“…Miniature bacteria can be obtained experimentally by starvation in culture (Hood and MacDonelll987) which implies morphological and physiological modifications. Some advantages are associated with those reduced forms: increased surface : volume ratio (allowing a higher substrate incorporation rate per unit of biomass) (Wiebe 1984) and protection from zooplankton grazing.…”

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Relationships between bacterioplankton production and limnological variables: Necessity of bacterial size considerations

Letarte

Pine-Alloul

1991

Limnol. Oceanogr.

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With data from eight Canadian and eight Danish lakes, we used bacterioplankton production ([3H]thymidine incorporation) in multiple regression analyses to determine to which variable it is best related. We studied two size classes: < 1 µm and 1–3 µm. For the large bacteria (1–3 µm), primary production was the only statistically significant variable. For the small bacteria (<1 µm) abundance came first, followed by chlorophyll. Small bacteria have a more uniform reproductive rate. It is suggested that phytoplankton exudates are better substrates for large than for small bacteria. Temperature is not useful for predicting bacterial production, nor are concentrations of total organic C or dissolved organic C. Bacterial abundance increase with trophic status seems to be the cause of the correlation between bacterial production and the eutrophication gradient. The turnover time of large cells was shorter than that of small cells in 30 of 37 cases. A large bacterium represents ∼10–100 times more biomass per cell, so large bacteria are often the main source of organic matter synthesis.

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confidence: 82%

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confidence: 99%

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Relationships between bacterioplankton production and limnological variables: Necessity of bacterial size considerations

Letarte

Pine-Alloul

1991

Limnol. Oceanogr.

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“…For the purposes of this presentation, it is assumed that losses of carbon through excretion are negligible, although we recognize that under some conditions such losses may be significant. From recent reviews of marine bacterial activity (Williams 1973(Williams , 1984Joint and Morris 1982;Azam et al 1983;Wiebe 1984), there is a general consensus that natural assemblages of bacteria can utilize carbon from readily available substrates such as glucose and amino acids with efficiencies that frequently exceed 50% and reach as high as 80-90%. In contrast, the gross growth efficiency can be reduced to as low as 10% when complex substrates such as macrophyte residues are the major carbon source (Linley and Newell 1984).…”

Section: Conceptual Basismentioning

confidence: 99%