Environmental distribution of prokaryotic taxa

Tamames, Javier; Abellán, Juan J.; Pignatelli, Miguel; Camacho, Antonio; Moya, Andrés

doi:10.1186/1471-2180-10-85

Cited by 188 publications

(142 citation statements)

References 45 publications

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“…Spatial differentiation among samples was highly correlated with salinity, confirming the observations of two global meta-analyses of microbial diversity based on 16S rRNA gene sequences (Lozupone and Knight, 2007;Tamames et al, 2010). In one of these studies, Lozupone and Knight (2007) found that salinity was the primary environmental determinant for community composition across marine, freshwater, sediment and soil environments, more so than temperature, pH or other environmental factors.…”

Section: Discussionsupporting

confidence: 65%

Spatial variability overwhelms seasonal patterns in bacterioplankton communities across a river to ocean gradient

et al. 2011

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Few studies of microbial biogeography address variability across both multiple habitats and multiple seasons. Here we examine the spatial and temporal variability of bacterioplankton community composition of the Columbia River coastal margin using 16S amplicon pyrosequencing of 300 water samples collected in 2007 and 2008. Communities separated into seven groups (ANOSIM, Po0.001): river, estuary, plume, epipelagic, mesopelagic, shelf bottom (deptho350 m) and slope bottom (depth4850 m). The ordination of these samples was correlated with salinity (q ¼ À0.83) and depth (q ¼ À0.62). Temporal patterns were obscured by spatial variability among the coastal environments, and could only be detected within individual groups. Thus, structuring environmental factors (for example, salinity, depth) dominate over seasonal changes in determining community composition. Seasonal variability was detected across an annual cycle in the river, estuary and plume where communities separated into two groups, early year (April-July) and late year (August-Nov), demonstrating annual reassembly of communities over time. Determining both the spatial and temporal variability of bacterioplankton communities provides a framework for modeling these communities across environmental gradients from river to deep ocean.

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Section: Discussionsupporting

confidence: 65%

Spatial variability overwhelms seasonal patterns in bacterioplankton communities across a river to ocean gradient

et al. 2011

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“…Timoner et al (2014a) observed that biofilm on coarse sand, cobbles and hyporheic sediment reacted differently to the rewetting. OTUs affiliated to Actinobacteria and Proteobacteria were abundant in epipsammic and hyporheic biofilms, similarly to what is occurring in soils and river sediments (Gao et al, 2005;Tamames et al, 2010), while OTUs affiliated to the Cyanobacteria and the Firmicutes predominated on cobbles. These changes in community composition were accompanied by an increase in richness and diversity in epipsammic and hyporheic biofilms, likely favored by the increased number of niches provided by sand particles (Sigee, 2005).…”

Section: Structural Changes and Adaptations Of Biofilms To Dry And Wementioning

confidence: 77%

Stream Biofilm Responses to Flow Intermittency: From Cells to Ecosystems

Sabater

Timoner

Borrego

et al. 2016

Front. Environ. Sci.

102

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Temporary streams are characterized by the alternation of dry and wet hydrological phases, creating both a harsh environment for the biota as well as a high diversity of opportunities for adaptation. These systems are mainly microbial-based during several of these hydrological phases, and those growing on all solid substrata (biofilms) accordingly change their physical structure and community composition. Biofilms experience large decreases in cell densities and biomass, both of bacteria and algae, during dryness. Algal and bacterial communities show remarkable decreases in their diversity, at least locally (at the habitat scale). Biofilms also respond with significant physiological plasticity to each of the hydrological changes. The decreasing humidity of the substrata through the drying process, and the changing quantity and quality of organic matter and nutrients available in the stream during that process, causes unequal responses on the biofilm bacteria and algae. Biofilm algae are affected faster than bacteria by the hydric stress, and as a result the ecosystem respiration resists longer than gross primary production to the increasing duration of flow intermittency. This response implies enhancing ecosystem heterotrophy, a pattern that can be exacerbated in temporary streams suffering of longer dry periods under global change.Keywords: biofilm, dry-rewetting cycle, temporary, intermittency, bacteria, algae, Mediterranean THE RELEVANCE OF TEMPORARY STREAMS IN THE WORLDFlow intermittency is part of the natural hydrology for streams and rivers, especially in arid and semi-arid landscapes. Temporary streams, or those that cease to flow at some points in space and time along their course, are a large fraction of many river networks, basically in tributaries of small order, but also in segments in the middle and lower parts of river networks. The number of temporary streams has been probably underestimated , as it appears from the application of novel on-site sensors, advances in remote sensing, and new modeling approaches. Flow intermittency has been estimated to account for 69% of first-order streams below 60 • , and up to 34% of larger order rivers (Raymond et al., 2013). Flow intermittency produces periodic or eventrelated loss of hydrologic connectivity between stream compartments, with consequences for all the processes ongoing in a waterway. Thus, flow intermittency triggers a chain of cascading effects eventually affecting water chemistry and biogeochemistry, as well as biodiversity, and ultimately community structure and ecosystem functioning.The direct implications of climate change and anomalous climatic events on flow regime are behind of the increasing temporality of many streams and rivers. Complex planetary scale processes, as well as local processes, may justify these situations. Anomalies such as the El Niño

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“…External osmolarity is the major factor shaping microbial community composition (Lozupone and Knight, 2007;Tamames et al, 2010), as both hyperand hypo-osmotic environmental changes constitute a major stress for single cell organisms (Morbach and Krämer, 2002). Moreover, primary productivity has also been shown to influence the diversity and composition of bacterial communities (HornerDevine et al, 2003;Smith, 2007).…”

Section: Discussionmentioning

confidence: 99%

Mechanisms determining the fate of dispersed bacterial communities in new environments

2012

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Recent work has shown that dispersal has an important role in shaping microbial communities. However, little is known about how dispersed bacteria cope with new environmental conditions and how they compete with local resident communities. To test this, we implemented two full-factorial transplant experiments with bacterial communities originating from two sources (freshwater or saline water), which were incubated, separately or in mixes, under both environmental conditions. Thus, we were able to separately test for the effects of the new environment with and without interactions with local communities. We determined community composition using 454-pyrosequencing of bacterial 16S rRNA to specifically target the active fraction of the communities, and measured several functional parameters. In absence of a local resident community, the net functional response was mainly affected by the environmental conditions, suggesting successful functional adaptation to the new environmental conditions. Community composition was influenced both by the source and the incubation environment, suggesting simultaneous effects of species sorting and functional plasticity. In presence of a local resident community, functional parameters were higher compared with those expected from proportional mixes of the unmixed communities in three out of four cases. This was accompanied by an increase in the relative abundance of generalists, suggesting that competitive interactions among local and immigrant taxa could explain the observed 'functional overachievement'. In summary, our results suggest that environmental filtering, functional plasticity and competition are all important mechanisms influencing the fate of dispersed communities.

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Environmental distribution of prokaryotic taxa

Cited by 188 publications

References 45 publications

Spatial variability overwhelms seasonal patterns in bacterioplankton communities across a river to ocean gradient

Spatial variability overwhelms seasonal patterns in bacterioplankton communities across a river to ocean gradient

Stream Biofilm Responses to Flow Intermittency: From Cells to Ecosystems

Mechanisms determining the fate of dispersed bacterial communities in new environments

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