Limnohabitans planktonicus sp. nov. and Limnohabitans parvus sp. nov., planktonic betaproteobacteria isolated from a freshwater reservoir, and emended description of the genus Limnohabitans

Kasalický, Vojtěch; Jezbera, Jan; Šimek, Karel; Hahn, Martin W.

doi:10.1099/ijs.0.018952-0

Cited by 80 publications

(106 citation statements)

References 24 publications

(38 reference statements)

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“…So far, two Limnohabitans spp. strains targeted by probe R-BT have been cultured (Kasalicky et al 2010). These isolates do not grow at NaCl concentrations .…”

Section: Discussionmentioning

confidence: 99%

Seasonal dynamics and activity of typical freshwater bacteria in brackish waters of the Gulf of Gdańsk

Piwosz

Salcher

Zeder

et al. 2013

Limnology & Oceanography

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While typical freshwater and marine bacteria have been found to co-occur in brackish habitats, it is unknown if they are active members of the local bacterial assemblages or if their presence is the result of passive transport only. We followed the seasonal dynamics of typical freshwater bacteria (R-BT lineage of Betaproteobacteria; Ac1 Actinobacteria; LD12 Alphaproteobacteria) and of marine SAR11 Alphaproteobacteria in the brackish water of the Gulf of Gdań sk (southern Baltic Sea), and we assessed their incorporation of thymidine and leucine at three distinct environmental conditions. The temporal development of bacteria was driven not only by local conditions but also by phenomena resulting from the dynamic hydrology of the site. Both temperature and salinity were important factors influencing bacterial community composition, as reflected by the clear distinction of three assemblages in spring and summer and during a period of enhanced freshwater influx. During spring, high proportions of R-BT Betaproteobacteria and Ac1 Actinobacteria incorporated the radiolabeled tracers, and all three freshwater lineages were most active during the subsequent phase of low salinity. The summer period was characterized by highest abundances of Ac1 Actinobacteria and of both alphaproteobacterial lineages. All studied freshwater lineages were active members of the brackish water communities at specific environmental conditions, including LD12 Alphaproteobacteria, which have so far been considered to thrive exclusively in freshwater habitats. By contrast, the presence of the typical marine SAR11 bacteria seemed to result from passive inflow with more saline waters from the Baltic proper.Marine and freshwater systems pose very distinct challenges for aquatic organisms. While offshore pelagic waters are often oligotrophic and with limited terrestrial effect, lakes and rivers are comparatively small, discontinuous habitats with productivity ranging from oligotropic to eutrophic and often featuring high input of terrestrial organic matter from the catchment. However, the most conspicuous difference is salinity. Marine organisms are isotonic or hypotonic, while freshwater ones are hypertonic. Both physiology and the cost of osmoregulation make the marine-freshwater boundary an insurmountable barrier for many bacteria (Logares et al.

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“…So far, two Limnohabitans spp. strains targeted by probe R-BT have been cultured (Kasalicky et al 2010). These isolates do not grow at NaCl concentrations .…”

Section: Discussionmentioning

confidence: 99%

Seasonal dynamics and activity of typical freshwater bacteria in brackish waters of the Gulf of Gdańsk

Piwosz

Salcher

Zeder

et al. 2013

Limnology & Oceanography

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“…It is also worth mentioning that novel bacteria were discovered through pyrosequencing in the present study. The Thermotogales bacteria were classified as Kosmotoga, which was recently proposed as a new genus (Kasalický et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Bacterial communities of Beijing surface waters as revealed by 454 pyrosequencing of the 16S rRNA gene

Wei

Wang

Liu

et al. 2015

Environ Sci Pollut Res

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As a better understanding of Beijing surface water ecosystems can provide clues for environmental management and public health, here, we report a study of the bacterial communities of five Beijing surface waters conducted using 454 pyrosequencing of 16S ribosomal RNA (rRNA) genes. We expected to observe a core bacterial community among the surface waters and differences in bacterial community abundance over the different locations of sampling. In this study, we obtained a total of 60,810 trimmed reads from the five samples after the removal of unqualified reads. Bacterial sequences from the five samples were classified into taxonomic classes using the default settings of the mothur platform. Our results provided insight into the bacterial community composition of surface waters and revealed that there was a core microbial community in the microbial populations of surface samples at different geographic locations, with 13 phyla and 40 genera in common. Our findings also revealed the differences in bacterial communities among five surface water samples obtained at different locations.

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“…The Limnohabitans cluster so far comprises four described species that differ in morphology and phenotypic traits such as substrate acquisition patterns . The well-established probe R-BT065 targets only two of these isolates (i.e., L. parvus and L. planktonicus; Kasalicky et al 2010) with different susceptibility to protistan predation and viral lysis (Š imek et al 2010). Therefore, ecological niche differentiation of Limnohabitans ecotypes might be a possible explanation for their conspicuous longitudinal distribution in Lake Zurich.…”

Section: Discussionmentioning

confidence: 99%

Vertical and longitudinal distribution patterns of different bacterioplankton populations in a canyon‐shaped, deep prealpine lake

Salcher

Pernthaler

Frater

et al. 2011

Limnology & Oceanography

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The pelagic zone of large, deep freshwater lakes features pronounced horizontal and vertical gradients of physicochemical parameters, which in turn might allow for a nonuniform occurrence of specifically adapted bacterial taxa. We, therefore, studied the spatial distribution patterns of different heterotrophic bacteria, picocyanobacteria, and the dominant primary producer, the filamentous cyanobacterium Planktothrix rubescens, in a large, canyon-shaped, prealpine lake (Lake Zurich, Switzerland), in six vertical profiles along a 21.7-km longitudinal transect. Highest total densities and proportions of cells with high nucleic acid content were in the warm epilimnion and the hypoxic zone of the hypolimnion. P. rubescens formed a dense layer in the metalimnion throughout the lake, whereas picocyanobacteria populated the water layers above. The epilimnion was mainly inhabited by ultramicrobacteria related to the LD12-lineage of Alphaproteobacteria and to Actinobacteria; the latter group preferred the shallow regions. Cytophaga-Flavobacteria, in particular a population related to Fluviicola sp. were more frequent in and below the layer of maximal P. rubescens abundances. Betaproteobacteria, on the other hand, were highly abundant in the epi-and hypolimnion, but not in the P. rubescens layer. Four betaproteobacterial subpopulations with contrasting longitudinal and/or vertical habitat preferences were distinguished: putatively methylotrophic bacteria of the LD28 lineage (beta IV) preferentially inhabited the hypolimnion, Polynucleobacter acidiphobus was found throughout the epilimnion, Limnohabitans (R-BT065) more in the shallow regions of the lake, and Polynucleobacter necessarius ssp. asymbioticus only in hypoxic waters. Our results stress the potential importance of spatial niche differentiation in freshwater bacterioplankton.

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Limnohabitans planktonicus sp. nov. and Limnohabitans parvus sp. nov., planktonic betaproteobacteria isolated from a freshwater reservoir, and emended description of the genus Limnohabitans

Cited by 80 publications

References 24 publications

Seasonal dynamics and activity of typical freshwater bacteria in brackish waters of the Gulf of Gdańsk

Seasonal dynamics and activity of typical freshwater bacteria in brackish waters of the Gulf of Gdańsk

Bacterial communities of Beijing surface waters as revealed by 454 pyrosequencing of the 16S rRNA gene

Vertical and longitudinal distribution patterns of different bacterioplankton populations in a canyon‐shaped, deep prealpine lake

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