Bacterial production and growth efficiencies: Direct measurements on riverine aggregates

Grossart, Hans‐Peter; Ploug, Helle

doi:10.4319/lo.2000.45.2.0436

Cited by 80 publications

(53 citation statements)

References 36 publications

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“…The integrated PAB productivity was up to 1.8 times higher than that of PP. These values were higher than values reported for the temperate region (Williams 1981, Cole et al 1988), but were closer to that reported for the Indus River delta (Bano et al 1997).Particles are known to be preferential sites for bacterial colonization (Grossart & Ploug 2000). The cumulative carbon flux into bacteria, or bacterial carbon demand (BCD) is the ratio of BP to the bacterial growth efficiency (BGE).…”

supporting

confidence: 53%

“…Particles are known to be preferential sites for bacterial colonization (Grossart & Ploug 2000). The cumulative carbon flux into bacteria, or bacterial carbon demand (BCD) is the ratio of BP to the bacterial growth efficiency (BGE).…”

Section: Discussionmentioning

confidence: 99%

“…Earlier studies (Simon et al 1990, Smith et al 1992, Grossart & Simon 1998) measured aggregate-associated bacterial production by pooling several aggregates. However, Ploug & Grossart (1999) and Grossart & Ploug (2000) showed high variability in production rates among aggregates of same and different sizes of particles due to a diffusion coefficient, as the exchange of solutes like radiotracers is reduced when aggregates are pooled and not in continuous suspension. In our study, although the aggregates were not pooled, the variability in number and weight per volume was low.…”

Section: Postmonsoonmentioning

confidence: 99%

“…All of these studies have shown the variability of BGE depending on the age of the aggregates and that the assumption that BGE increases with BP may not hold for estuaries with high allochthonous inputs from terrestrial sources. Thus, BGE of aggregates can range from 3 to 49% with an average of 24% (Grossart & Ploug 2000). Further, the reported range of BGE of the total bacterioplankton in the Mandovi estuary was from 22 to 31% (Ram et al 2007).…”

mentioning

confidence: 99%

“…Since PAB respiration was not measured in this study, the BGE value was obtained using 2 methods. In the first method, we used the equation of Grossart & Ploug (2000), and in the second method we took the reported BGE values from the literature and used it for calculation of BCD.Grossart (1)The BR value was calculated to be 159, and accordingly, the BGE was estimated to be 57%. The annual BCD for PAB was estimated to be 373 mg C m -2 (Table 3).…”

mentioning

confidence: 99%

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Abundance and production of particle-associated bacteria and their role in a mangrove-dominated estuary

Gonsalves¹,

Nair²,

Bharathi³

et al. 2009

Aquat. Microb. Ecol.

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A 1 yr study was carried out in the mangrove-dominated, tropical Mandovi estuary (Goa, India) to assess the contribution of particle-associated bacteria (PAB) to the system's variability in terms of abundance and productivity. The suspended load, which was composed of inorganic mineral grains and allochthonous materials including mangrove litter, was high during the southwest (SW) monsoon season. The ratio of organic:inorganic content of these particles was low during the pre-and post-monsoon seasons. PAB abundance ranged from 0.01 × 10 10 to 22.8 × 10 10 m -2 and accounted for 4 to 94% of the total bacterial abundance. The variation in PAB abundance was due to their preferential colonization, which depended on the quantity and quality of the particles. The average annual PAB production was 214 µg C m -2 d -1 and contributed to an average of 35% of the total bacterial production. Primary productivity (PP) was 137, 14, and 163 µg C m -2 d -1 for the pre-monsoon, SW monsoon, and post-monsoon periods, respectively. The calculated maximum bacterial carbon demand (BCD) of PAB was 37% of the total BCD. On an annual basis, <1% of PP contributed to PAB-BCD. It is suggested that the rest of the BCD was met from mangrove litter and other allochthonous sources. Principal component analysis showed that biotic parameters were predictors for ~50% of the variability and had a marked seasonality linked to salinity. The allochthonous sources contributed significantly to the structure of the biological community of this mangrove-dominated estuary.KEY WORDS: Particle-associated bacteria · Abundance · Production · Tropical mangrove estuary · Goa · India Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 57: 151-159, 2009151-159, et al. 1998151-159, , Revilla et al. 2000, the data from tropical (Bano et al. 1997, De Souza et al. 2003) and sub-tropical (Ducklow & Shiah 1993) estuaries are scant despite PAB being ubiquitous. In the Indus River delta, Bano et al. (1997) reported that bacterial production associated with particles was carbon limited and could have a major impact on mangrove ecosystem structure and functioning and the production of economically important fishes and shrimps. A study from the tropical Zuari estuary situated on the west coast of India showed that PAB are a significant component of the total bacterioplankton, and the dynamics were determined by the availability of the substrates and the re-suspension of the sedimented material (De Souza et al. 2003). Although adjacent to each other on the west coast of India, the Mandovi and Zuari estuaries are influenced by different factors, viz. a narrower channel, more freshwater input, and frequent navigation activities in the Mandovi than in the Zuari estuary. Thus, each estuarine environment exhibits a wide variation in its physical and chemical factors. One may expect PAB to be governed by different factors in each estuary. Even less understood is how monsoon-driven wind influences bacterial processes in a...

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supporting

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Section: Postmonsoonmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Abundance and production of particle-associated bacteria and their role in a mangrove-dominated estuary

Gonsalves¹,

Nair²,

Bharathi³

et al. 2009

Aquat. Microb. Ecol.

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Microbiology of Lotic Aggregates and Biofilms

Strauss¹

2004

Water Encyclopedia

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The diverse and abundant microbial communities present in aggregates and biofilms of flowing water systems are important for organic matter processing, nutrient cycling, and the transfer of energy among trophic levels. Aggregates (free‐floating particulate matter and associated microorganisms) and biofilms (thin slime layers present on surfaces and substrates) are present in most aquatic systems, but the physical stresses exerted by flowing water maintain aggregates at smaller sizes and cause biofilms to be more dense and more stable than their counterparts in nonflowing systems. Both aggregates and biofilms contain microbially produced exopolymers that bind their contents together and assist in the capture of additional nutrients, organic matter, and other microorganisms. The density of bacterial cells and rates of bacterial activity are typically greater in aggregates and biofilms compared with bacterial density and activity in the surrounding water. This high microbial activity can lead to chemical and biological gradients, especially within biofilms, that are particularly important for cycling of nutrients such as nitrogen, sulfur, and carbon. Specialized and often colorful biofilms dominated by unique groups of microorganisms can develop in certain environments exhibiting specific chemical and physical conditions.

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Characteristics, Dynamics and Importance of Aggregates in Rivers - An Invited Review

Zimmermann-Timm

2002

Internat. Rev. Hydrobiol.

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Bacterial production and growth efficiencies: Direct measurements on riverine aggregates

Cited by 80 publications

References 36 publications

Abundance and production of particle-associated bacteria and their role in a mangrove-dominated estuary

Abundance and production of particle-associated bacteria and their role in a mangrove-dominated estuary

Microbiology of Lotic Aggregates and Biofilms

Characteristics, Dynamics and Importance of Aggregates in Rivers - An Invited Review

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