Temporal and spatial dynamics in microbial community composition within a temperate stream network

Hassell, Norman Henry; Tinker, Kara; Moore, Thomas; Ottesen, Elizabeth A.

doi:10.1111/1462-2920.14311

Cited by 45 publications

(41 citation statements)

References 48 publications

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“…The transport of microbes from soils to small streams was previously shown using DNA sequencing techniques and this transfer has been hypothesized to alter downstream microbial communities (Crump et al 2012;Ruiz-González et al 2015;Savio et al 2015). Bacterial transfer to streams was also shown to vary throughout the year and in response to changes in temperature and precipitation (Hassell et al 2018;Hermans et al 2019;Teachey et al 2019). However, DNA sequencing data do not provide quantitative information and, to this day, little is known about the dynamics and seasonality of bacterial abundances in small headwater streams (Richardson 2019).…”

Section: Introductionmentioning

confidence: 93%

Dynamic transfer of soil bacteria and dissolved organic carbon into small streams during hydrological events

Caillon

Schelker

2020

Aquat Sci

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Small headwater streams interlink catchment soils with the river network. As water makes its way from the hillslopes to the stream, it may transport dissolved organic carbon (DOC) and potentially soil microbes into stream water. In this study, we aimed at quantifying the dynamic transfer of DOC and microbial life, namely bacteria from catchment soils into streams. We hypothesized that increased soil saturation enhances the lateral inflow of bacteria and DOC into streams. To address this hypothesis, we sampled six first order streams and three soil transects at two different depths located within the pre-alpine Oberer Seebach (OSB) catchment in Austria over a duration of 2 years. We found a strong variation in DOC concentrations (range 0.4-5.6 mg L −1 ) and bacterial abundances (range < 500,000-3,863,000 cells mL −1 ) measured by flow-cytometry. The highest values of DOC and bacterial cells occurred during high flow events. DOC concentration and bacterial abundance were correlated across all streams and seasons. In soils, DOC ranges were higher and were also correlated with bacterial abundance, while DOC concentrations were ∼ 10 times higher per bacterial cell than in streams. Overall we show that soils provide a dynamic inflow of bacteria and DOC to first order streams. Most probably, this results in a dynamic and reoccurring inoculation of small streams from catchment soils during runoff events. We propose that this dynamic microbial inoculation of small streams is potentially relevant for microbial community dynamics of downstream receiving waters.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Introductionmentioning

confidence: 93%

Dynamic transfer of soil bacteria and dissolved organic carbon into small streams during hydrological events

Caillon

Schelker

2020

Aquat Sci

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“…There are a few studies that specifically had the aim to simultaneously investigate community assembly processes over multiple spatial scales (Ramette and Tiedje, ; Martiny et al ., ; Shi et al ., ; Comte et al ., ; O'Brien et al ., ; Hassell et al ., ), that could be used to test our conceptual model. For instance, Martiny et al .…”

Section: Factors Influencing the Importance Of Different Community Asmentioning

confidence: 99%

“…There are a few studies that specifically had the aim to simultaneously investigate community assembly processes over multiple spatial scales (Ramette and Tiedje, 2007;Martiny et al, 2011;Shi et al, 2015;Comte et al, 2016;O'Brien et al, 2016;Hassell et al, 2018), that could be used to test our conceptual model. For instance, Martiny et al (2011) compared the effect of environmental and spatial variables on ammonia-oxidizing bacterial communities in marshes at three spatial scales (within marshes, among marshes and among continents) and found the strongest spatial effects at the within-marsh scale, i.e., at spatial scales ranging between a few centimetres up to 1 km.…”

Section: Spatial Scalementioning

confidence: 99%

Factors influencing aquatic and terrestrial bacterial community assembly

Langenheder

Lindström

2019

Environ Microbiol Rep

165

141

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Summary During recent years, many studies have shown that different processes including drift, environmental selection and dispersal can be important for the assembly of bacterial communities in aquatic and terrestrial ecosystems. However, we lack a conceptual overview about the ecological context and factors that influence the relative importance of the different assembly mechanisms and determine their dynamics in time and space. Focusing on free‐living, i.e., nonhost associated, bacterial communities, this minireview, therefore, summarizes and conceptualizes findings from empirical studies about how (i) environmental factors, such as environmental heterogeneity, disturbances, productivity and trophic interactions; (ii) connectivity and dispersal rates (iii) spatial scale, (iv) community properties and traits and (v) the use of taxonomic/phylogenetic or functional metrics influence the relative importance of different community assembly processes. We find that there is to‐date little consistency among studies and suggest that future studies should now address how (i)–(v) differ between habitats and organisms and how this, in turn, influences the temporal and spatial‐scale dependency of community assembly processes in microorganisms.

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“…Temporal trends in community profiles have been described in many riverine systems (3,(5)(6)(7)(12)(13)(14)(15)(16)(17)(18). In several of these studies, the same taxa were found over time, varying in abundance based on shifts in physiochemical factors or following landscape-level disturbances (5,10,13,(17)(18)(19)(20). This reoccurrence of taxa has led several groups to suggest the presence of a core community that is of particular importance in shaping riverine community dynamics (2,9,10,13,(21)(22)(23).…”

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confidence: 99%

“…appears to be soil and soil waters (1,2,8,12), with pelagic stream community assembly resulting from the enrichment of bacteria present in these environments at low abundance. From the headwaters, the bacterioplankton community continues to develop as it travels through the stream network (10,11,13).…”

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confidence: 99%

Rapid and Stable Microbial Community Assembly in the Headwaters of a Third-Order Stream

Teachey

McDonald

Ottesen

2019

Appl Environ Microbiol

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Small streams and their headwaters are key sources of microbial diversity in fluvial systems and serve as an entry point for bacteria from surrounding environments. Community assembly processes occurring in these streams shape downstream population structure and nutrient cycles. To elucidate the development and stability of microbial communities along the length of a first-through third-order stream, fine-scale temporal and spatial sampling regimes were employed along Mc-Nutt Creek in Athens, GA, USA. 16S rRNA amplicon libraries were constructed from samples collected on a single day from 19 sites spanning the first 16.76 km of the stream. To provide context for this spatial study and evaluate temporal variability, selected sites at the stream's upper, mid, and lower reaches were sampled daily for 5 days preceding and following the spatial study. In a second study, three sites at and near the creek's headwaters were sampled daily for 11 days to understand initial bacterioplankton community assembly. Both studies revealed decreasing alpha and beta diversity with increasing downstream distance. These trends were accompanied by the enrichment of a small fraction of taxa found at low abundance in headwaterproximal sites. Similar sets of taxa consistently increased in relative abundance in downstream samples over time scales ranging from 1 day to 1 year, many of which belong to clades known to be abundant in freshwater environments. These results underpin the importance of headwaters as the site of rapid in-stream selection that results in the reproducible establishment of a highly stable community of freshwater riverine bacteria. IMPORTANCE Headwater streams are critical introduction points of microbial diversity for larger connecting rivers and play key roles in the establishment of taxa that partake in in-stream nutrient cycling. We examined the microbial community composition of a first-through third-order stream using fine-scale temporal and spatial regimes. Our results show that the bacterioplankton community develops rapidly and predictably from the headwater population with increasing total stream length. Along the length of the stream, the microbial community exhibits substantial diversity loss and enriches repeatedly for select taxa across days and years, although the relative abundances of individual taxa vary over time and space. This repeated enrichment of a stable stream community likely contributes to the stability and flexibility of downstream communities.

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Temporal and spatial dynamics in microbial community composition within a temperate stream network

Cited by 45 publications

References 48 publications

Dynamic transfer of soil bacteria and dissolved organic carbon into small streams during hydrological events

Dynamic transfer of soil bacteria and dissolved organic carbon into small streams during hydrological events

Factors influencing aquatic and terrestrial bacterial community assembly

Rapid and Stable Microbial Community Assembly in the Headwaters of a Third-Order Stream

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