Distribution of aerobic anoxygenic phototrophs in temperate freshwater systems

Mašı́n, Michal; Nedoma, Jiří; Pechar, Libor; Koblížek, Michal

doi:10.1111/j.1462-2920.2008.01615.x

Cited by 77 publications

(106 citation statements)

References 34 publications

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“…In contrast, various reports showed that these organisms are abundant in eutrophic as well as in oligotrophic environments (Jiao et al, 2007;Koblížek et al, 2006;Yutin et al, 2007). Other authors suggested that nutrient concentrations (Mašín et al, 2008), attachment to particles Waidner and Kirchman, 2007) or light intensity (Koblížek et al, 2003;Shiba, 1991) may influence AAP bacterial abundance.…”

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confidence: 75%

“…It has been hypothesized that the capacity of AAP bacteria to generate energy from light could reduce the metabolic requirements for recycling the organic carbon resources (Cho et al, 2007). Mašín et al (2008) suggested that light-generated energy could enhance P acquisition in P-depleted environments. On the basis of our nutrient-addition experiments, we cannot speculate about P-limitation of AAP bacteria since growth of AAP and total prokaryotes were not stimulated by P addition, although higher heterotrophic bacterial activity was observed.…”

Section: Bacterial Productionmentioning

confidence: 99%

“…The intensity of the 974 D. Lamy et al: Aerobic anoxygenic phototrophs in the Mediterranean Sea 2005). The metabolic flexibility, fast growth, high abundance and widespread occurrence of these organisms in both marine and freshwater environments challenge our view of carbon and energy budgets (Eiler, 2006;Lamy et al, 2011;Mašín et al, 2008;Moran and Miller, 2007) and suggest that AAP bacteria play a significant role in aquatic food webs and biogeochemical cycles (Koblížek et al, 2007;Kolber et al, 2001). …”

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confidence: 99%

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Ecology of aerobic anoxygenic phototrophic bacteria along an oligotrophic gradient in the Mediterranean Sea

et al. 2011

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Abstract. Aerobic anoxygenic phototrophic (AAP) bacteria are photoheterotrophic prokaryotes able to use both light and organic substrates for energy production. They are widely distributed in coastal and oceanic environments and may contribute significantly to the carbon cycle in the upper ocean. To better understand questions regarding links between the ecology of these photoheterotrophic bacteria and the trophic status of water masses, we examined their horizontal and vertical distribution and the effects of nutrient additions on their growth along an oligotrophic gradient in the Mediterranean Sea. Concentrations of bacteriochlorophyll-a (BChl-a) and AAP bacterial abundance decreased from the western to the eastern basin of the Mediterranean Sea and were linked with concentrations of chlorophyll-a, nutrient and dissolved organic carbon. Inorganic nutrient and glucose additions to surface seawater samples along the oligotrophic gradient revealed that AAP bacteria were nitrogen-and carbon-limited in the ultraoligotrophic eastern basin. The intensity of the Correspondence to: D. Lamy (lamyd2@univie.ac.at) AAP bacterial growth response generally differed from that of the total bacterial growth response. BChl-a quota of AAP bacterial communities was significantly higher in the eastern basin than in the western basin, suggesting that reliance on phototrophy varied along the oligotrophic gradient and that nutrient and/or carbon limitation favors BChl-a synthesis.

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confidence: 75%

Section: Bacterial Productionmentioning

confidence: 99%

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confidence: 99%

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Ecology of aerobic anoxygenic phototrophic bacteria along an oligotrophic gradient in the Mediterranean Sea

et al. 2011

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“…Given their capability of harvesting light energy, they represent an important fraction of the bacterioplankton in freshwater and marine illuminated environments (Kolber et al, 2000(Kolber et al, , 2001Béjà et al, 2002;Jiao et al, 2007;Yutin et al, 2007;Masin et al, 2008;Jiang et al, 2009). AAP bacteria were found to be widely distributed in the marine environment representing about 1.5-5 % of total bacteria in the euphotic zone of the ocean (Schwalbach and Fuhrman, 2005;Cottrell et al, 2006;Sieracki et al, 2006;Jiao et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Diversity of cultivated and metabolically active aerobic anoxygenic phototrophic bacteria along an oligotrophic gradient in the Mediterranean Sea

et al. 2011

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Abstract. Aerobic anoxygenic phototrophic (AAP) bacteria play significant roles in the bacterioplankton productivity and biogeochemical cycles of the surface ocean. In this study, we applied both cultivation and mRNA-based molecular methods to explore the diversity of AAP bacteria along an oligotrophic gradient in the Mediterranean Sea in early summer 2008. Colony-forming units obtained on three different agar media were screened for the production of bacteriochlorophyll-a (BChl-a), the light-harvesting pigment of AAP bacteria. BChl-a-containing colonies represented a low part of the cultivable fraction. In total, 54 AAP strains were isolated and the phylogenetic analyses based on their 16S rRNA and pufM genes showed that they were all affiliated to the Alphaproteobacteria. The most frequently isolated strains belonged to Citromicrobium bathyomarinum, and Erythrobacter and Roseovarius species. Most other isolates were related to species not reported to produce BChl-a and/or may represent novel taxa. Direct extraction of RNA from seawater samples enabled the analysis of the expression of pufM, the gene coding for the M subunit of the reaction centre complex of aerobic anoxygenic photosynthesis. Clone libraries of pufM gene transcripts revealed that most phylotypes were highly similar to sequences previously recovered from the Mediterranean Sea and a large majority (∼94 %) was affiliated to the Gammaproteobacteria. The most abundantly detected phylotypes occurred in the western and eastern Mediterranean basins. However, some were exclusivelyCorrespondence to: C. Jeanthon (jeanthon@sb-roscoff.fr) detected in the eastern basin, reflecting the highest diversity of pufM transcripts observed in this ultra-oligotrophic region. To our knowledge, this is the first study to document extensively the diversity of AAP isolates and to unveil the active AAP community in an oligotrophic marine environment. By pointing out the discrepancies between culture-based and molecular methods, this study highlights the existing gaps in the understanding of the AAP bacteria ecology, especially in the Mediterranean Sea and likely globally.

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“…Aerobic anoxygenic phototrophs (AAP; belonging to Alpha-and Gammaproteobacteria) have been described for marine habitats and more recently for freshwater systems (Page et al 2004, Gich & Overmann 2006. Masin et al (2008) reported on the important and widespread distribution of such phototrophs (containing bacteriochlorophyll a) in freshwater environments. They are obligate aerobes because they require oxygen for respiration and growth.…”

Section: Bacteria Related To the Main Biogeochemical Cyclesmentioning

confidence: 99%

Unravelling the bacterial diversity found in the semi-arid Tablas de Daimiel National Park wetland (central Spain)

D’Auria

Barón-Rodríguez²,

Durbán-Vicente³

et al. 2010

Aquat. Microb. Ecol.

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Our knowledge of microbial diversity in the environment is still limited, and there are many species as yet unidentified in both soil and water. Studies of the microbial diversity of wetland ecosystems have been neglected for years, as is the case of Tablas de Daimiel National Park (TDNP), a Spanish semi-arid wetland system of international importance in terms of waterfowl. We report the bacterial diversity of water column, sediment (upper and lower layers) and biofilm samples from the TDNP system using a 16S rRNA gene library approach. A sequence comparison of the 703 clones obtained revealed a number of bacterial phylogroups unreported to date. Bacterial diversity was high (Shannon values of 3.2 to 4.9), with the highest corresponding to the water sample, followed by the water-sediment interface (upper sediment). The sequences affiliated with the Proteobacteria and Bacteroidetes phyla were the most frequently found. Sequence distribution corresponded closely between the water column and upper sediment layers on the one hand, and the lower sediment and biofilm layers on the other. Gamma-and Deltaproteobacteria were the most dominant groups in the clone libraries from samples of water and upper sediment environments, whereas Alpha-and Betaproteobacteria were dominant in lower sediment and biofilm. In total, 265 new phylogroups were found with less than 97% similarity to the closest taxonomically defined 16S rRNA gene sequences in public sequence repositories.KEY WORDS: Microbial communities · Bacterioplankton · Sediment · Water-sediment interface · Biofilm · 16S rRNA · Wetlands Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 59: [33][34][35][36][37][38][39][40][41][42][43][44] 2010 Tablas de Daimiel National Park (TDNP), located in the centre of the Iberian Peninsula, is among the most important Spanish wetland systems. In 1940, it covered about 150 km 2 (Heras et al. 1971), although currently it is greatly diminished (Alvarez-Cobelas et al. 2001). TDNP has been subjected to drainage policies during the last 60 yr, mainly to extend agricultural lands (Cobelas et al. 1996). Water pollution, mainly organic matter, nitrogen and phosphorus, coming from point (towns and agro-industry) and non-point (agricultural practices in the watershed) sources, started in the late 1970s and reached a peak by the middle of the following decade, decreasing later as a result of newly implemented water-treatment plants in the catchment area. Water availability became limited between the late 1970s and the 1990s because of irrigation programs, which depleted the groundwater aquifer. Despite this, the land is still valuable in terms of its waterfowl populations (particularly the red-crested pochard Netta rufina Pallas) and plant species (e.g. the macrophyte Cladium mariscus [L.] Pohl). TDNP was designated as a Special Protection Area in 1979 (EU Birds Directive). It has also been a RAMSAR site since 1982 (Convention on Wetlands of International Importance, Iran, 1971; www.ra...

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Distribution of aerobic anoxygenic phototrophs in temperate freshwater systems

Cited by 77 publications

References 34 publications

Ecology of aerobic anoxygenic phototrophic bacteria along an oligotrophic gradient in the Mediterranean Sea

Ecology of aerobic anoxygenic phototrophic bacteria along an oligotrophic gradient in the Mediterranean Sea

Diversity of cultivated and metabolically active aerobic anoxygenic phototrophic bacteria along an oligotrophic gradient in the Mediterranean Sea

Unravelling the bacterial diversity found in the semi-arid Tablas de Daimiel National Park wetland (central Spain)

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