Remineralization of organic matter and degradation of the organic fraction of suspended solids in the River Danube

Hoch, B. M.; Berger, B.; Kavka, Gerhard G.; Herndl, Gerhard J.

doi:10.3354/ame009279

Cited by 17 publications

(12 citation statements)

References 29 publications

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“…Accordingly, bacterioplanktonic production in an Alabama stream (35), periphytic biomass in Kennett River (United Kingdom) (19), and the occurrence of epilithic sodium dodecyl sulfate-degrading bacteria in Ely River (United Kingdom) (2) were highest in the summer and/or fall. In contrast, planktonic bacterial abundance showed no clear seasonal pattern in the Danube River (Austria) (25). In general, variations in biofilm productivity and activity could not be correlated with any physical or chemical factor.…”

Section: Discussionmentioning

confidence: 93%

Impact of Seasonal Variations and Nutrient Inputs on Nitrogen Cycling and Degradation of Hexadecane by Replicated River Biofilms

Chénier

Beaumier

Roy

et al. 2003

Appl Environ Microbiol

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Biofilm communities cultivated in rotating annular bioreactors using water from the South Saskatchewan River were assessed for the effects of seasonal variations and nutrient (C, N, and P) additions. Confocal laser microscopy revealed that while control biofilms were consistently dominated by bacterial biomass, the addition of nutrients shifted biofilms of summer and fall water samples to phototrophic-dominated communities. In nutrient-amended biofilms, similar patterns of nitrification, denitrification, and hexadecane mineralization rates were observed for winter and spring biofilms; fall biofilms had the highest rates of nitrification and hexadecane mineralization, and summer biofilms had the highest rates of denitrification. Very low rates of all measured activities were detected in control biofilms (without nutrient addition) regardless of season. Nutrient addition caused large increases in hexadecane mineralization and denitrification rates but only modest increases, if any, in nitrification rates, depending upon the season. Generally, both alkB and nirK were more readily PCR amplified from nutrient-amended biofilms. Both genes were amplified from all samples except for nirK from the fall control biofilm. It appears that bacterial production in the South Saskatchewan River water is limited by the availability of nutrients and that biofilm activities and composition vary with nutrient availability and time of year.

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Section: Discussionmentioning

confidence: 93%

Impact of Seasonal Variations and Nutrient Inputs on Nitrogen Cycling and Degradation of Hexadecane by Replicated River Biofilms

Chénier

Beaumier

Roy

et al. 2003

Appl Environ Microbiol

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“…Recently, the topic 'suspended particulate matter' (SPM) has been the subject of several comprehensive books (Eisma 1993, Rao 1993, Wotton 1994b, Kausch & Michaelis 1996. Aggregates in aquatic systems have been studied in oceans and estuaries (Albright et al 1986, Simon et al 1990, Smith et al 1992, Delong et al 1993, Lampitt et al 1993, Stehr et al 1995, Zimmermann & Kausch 1996, Capone et al 1997, Holloway & Cowan 1997, Hyun et al 1997, Zimmermann 1997, in lakes (Simon 1987, Grossart & Simon 1993, Weiss et al 1996, Grossart et al 1997 and in rivers (Droppo & Ongley 1994, Hoch et al 1995, Berger et al 1996. Due to their appearance the terms 'marine snow' and 'lake snow' were introduced.…”

Section: Introductionmentioning

confidence: 99%

In situ cell and glycoconjugate distribution in river snow studied by confocal laser scanning microscopy

Neu¹

2000

Aquat. Microb. Ecol.

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Aggregates from the river Elbe (Germany) were collected and examined by confocal laser scanning microscopy. The river snow was directly transferred into coverslip chambers and observed without any embedding and fixation procedure. River snow samples were examined in the reflection and fluorescence mode to record mineral content and autofluorescence signals. Spatial distribution of microb~al cells within the aggregates was shown with general nucleic acid specific stains (SYTO 9, SYTO 64). The polymeric matnx of the river snow was demonstrated by using a panel of fluorescently labelled lectins. Staining with FITC and TRITC labelled lectins and simultaneous dual channel unaging showed the distribution of different types of glycoconjugates. The binding pattern observed included bacterial cell surface labelling and cloud-type labelling of extracellular polymeric substances (EPS). In addition, dual staining combined with triple-channel recording was employed to clearly separate the signal in the red channel originating from TRITC-lectin or SYTO 64 nucleic acid stain from the far red autofluorescence originating from chlorophyll-containing organisms. With this approach the fully hydrated, living, 3-dimensional architecture of aquatic aggregates was investigated. Application of lectins demonstrated the heterogeneity of the EPS matrix in between the cellular constituents of the river snow community. The chemical heterogeneity of river snow may be significant for sorption and transport of nutrients and contaminants in lotlc aquatic environments. This in situ technique may be also useful to examine interfacial microbial consortia in other habitats. Finally, it is suggested to employ in situ lectin staining to probe for the glycoconjugate distribution at the polymer level similar to in situ hybridisation with rRNA targeted oligonucleotides at the cellular level.

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“…Additional inputs from land runoff and riverine sources occur during this period. The abundance of PAB in the Mandovi estuary was 2 to 4 times more than that reported in temperate waters (Hoch et al 1995, Berger et al 1996) and the adjacent Zuari estuary (De Souza et al 2003). However, it was lower than the highly organic rich Hudson and Indus River delta estuaries (Bano et al 1997, Sanudo-Wilhelmy & Taylor 1999.…”

Section: Postmonsoonmentioning

confidence: 68%

“…However, the possibility of these particles to be exclusively inorganic is remote, as mangrove litters are a source of particles in the > 3 to < 220 µm range in this estuary. Occurrences of higher numbers of inorganic particles associated with organic matter than the inorganic particles alone have been reported in estuaries like the Danube and San Francisco Bay (Hoch et al 1995, Berger et al 1996. On an annual basis, except for the months of March and August, organic carbon of the particles ranged from 2.6 to 7.8 mg m -2 with an overall high value during the SW monsoon season.…”

Section: Discussionmentioning

confidence: 98%

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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Remineralization of organic matter and degradation of the organic fraction of suspended solids in the River Danube

Cited by 17 publications

References 29 publications

Impact of Seasonal Variations and Nutrient Inputs on Nitrogen Cycling and Degradation of Hexadecane by Replicated River Biofilms

Impact of Seasonal Variations and Nutrient Inputs on Nitrogen Cycling and Degradation of Hexadecane by Replicated River Biofilms

In situ cell and glycoconjugate distribution in river snow studied by confocal laser scanning microscopy

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

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