Disentangling seasonal bacterioplankton population dynamics by high‐frequency sampling

Lindh, Markus V.; Sjöstedt, Johanna; Andersson, Anders F.; Baltar, Federico; Hugerth, Luisa W.; Lundin, Daniel; Muthusamy, Saraladevi; Legrand, Catherine; Pinhassi, Jarone

doi:10.1111/1462-2920.12720

Cited by 124 publications

(196 citation statements)

References 63 publications

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“…1b) and in APase (Fig. 2a), which is consistent with the rapid succession in different phytoplankton (and bacterioplankton) taxa during those months at this study site (Lindh et al, 2015).…”

Section: Resultssupporting

confidence: 88%

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Cell-free extracellular enzymatic activity is linked to seasonal temperature changes: a case study in the Baltic Sea

2016

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Abstract. Extracellular enzymatic activities (EEAs) are a crucial step in the degradation of organic matter. Dissolved (cell-free) extracellular enzymes in seawater can make up a significant contribution of the bulk EEA. However, the factors controlling the proportion of dissolved EEA in the marine environment remain unknown. Here we studied the seasonal changes in the proportion of dissolved relative to total EEA (of alkaline phosphatase (APase), β-glucosidase (BGase), and leucine aminopeptidase (LAPase)), in the Baltic Sea for 18 months. The proportion of dissolved EEA ranged between 37 and 100, 0 and 100, and 34 and 100 % for APase, BGase, and LAPase, respectively. A consistent seasonal pattern in the proportion of dissolved EEA was found among all the studied enzymes, with values up to 100 % during winter and < 40 % during summer. A significant negative relation was found between the proportion of dissolved EEA and temperature, indicating that temperature might be a critical factor controlling the proportion of dissolved relative to total EEA in marine environments. Our results suggest a strong decoupling of hydrolysis rates from microbial dynamics in cold waters. This implies that under cold conditions, cell-free enzymes can contribute to substrate availability at large distances from the producing cell, increasing the dissociation between the hydrolysis of organic compounds and the actual microbes producing the enzymes. This might also suggest a potential effect of global warming on the hydrolysis of organic matter via a reduction of the contribution of cell-free enzymes to the bulk hydrolytic activity.

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Section: Resultssupporting

confidence: 88%

“…1a). Chlorophyll a concentration varied between 0.4 and 4.8 µg L −1 , with maximum peaks during the two types of blooms that typically occur in the Baltic (Lindh et al, 2015), the diatom and dinoflagellate spring bloom (April-May), and the cyanobacterial summer bloom (July-September) (Fig. 1b).…”

Section: Resultsmentioning

confidence: 99%

Cell-free extracellular enzymatic activity is linked to seasonal temperature changes: a case study in the Baltic Sea

2016

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“…Salinity, temperature, and dissolved oxygen are among the most important environmental factors determining aquatic microbial community composition (Crump et al, 2004; Fuhrman et al, 2008; Herlemann et al, 2011). A global-scale meta-analysis of samples from different habitats suggested that salinity is the major determinant of bacterial communities (Lozupone and Knight, 2007), and strong seasonal shifts in the bacterial communities of marine as well as brackish environments have been demonstrated (Andersson et al, 2009; Gilbert et al, 2009; Lindh et al, 2015). In addition, long-term studies suggest predictable seasonal patterns of bacterial community dynamics (Fuhrman et al, 2008; Gilbert et al, 2012; Ladau et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The environmental conditions in the Baltic Sea show the typical seasonal changes of high-latitude ecosystems, including strong shifts in temperature, solar radiation, phytoplankton blooms, nutrient levels, and organic matter composition. Consequently, bacterial community composition in the Baltic Sea is strongly influenced by seasonal dynamics (Pinhassi and Hagström, 2000; Riemann et al, 2008; Andersson et al, 2009; Lindh et al, 2015). …”

Section: Introductionmentioning

confidence: 99%

Phylogenetic Signals of Salinity and Season in Bacterial Community Composition Across the Salinity Gradient of the Baltic Sea

et al. 2016

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Understanding the key processes that control bacterial community composition has enabled predictions of bacterial distribution and function within ecosystems. In this study, we used the Baltic Sea as a model system to quantify the phylogenetic signal of salinity and season with respect to bacterioplankton community composition. The abundances of 16S rRNA gene amplicon sequencing reads were analyzed from samples obtained from similar geographic locations in July and February along a brackish to marine salinity gradient in the Baltic Sea. While there was no distinct pattern of bacterial richness at different salinities, the number of bacterial phylotypes in winter was significantly higher than in summer. Bacterial community composition in brackish vs. marine conditions, and in July vs. February was significantly different. Non-metric multidimensional scaling showed that bacterial community composition was primarily separated according to salinity and secondly according to seasonal differences at all taxonomic ranks tested. Similarly, quantitative phylogenetic clustering implicated a phylogenetic signal for both salinity and seasonality. Our results suggest that global patterns of bacterial community composition with respect to salinity and season are the result of phylogenetically clustered ecological preferences with stronger imprints from salinity.

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“…Magurran and Henderson (2003) hypothesized that in macro-organisms, core species are well-adapted to surroundings, whereas, satellite species are under limitations of dispersal. This approach has proved to be a useful tool to understand ecological principles shaping communities of macro-organisms (Pärtel et al, 2001; Unterseher et al, 2011b; Supp et al, 2015) but has only infrequently been implemented in analyses of microbial communities (Ulrich and Zalewski, 2006; Unterseher et al, 2011a; Rogers et al, 2013; Lindh et al, 2015). …”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Variation of Core and Satellite Arbuscular Mycorrhizal Fungus Communities in Miscanthus giganteus

et al. 2016

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Arbuscular mycorrhizal fungi (AMF) are a group of obligate plant symbionts which can promote plant nutrition. AMF communities are diverse, but the factors which control their assembly in space and time remain unclear. In this study, the contributions of geographical distance, environmental heterogeneity and time in shaping AMF communities associated with Miscanthus giganteus (a perennial grass originating from south-east Asia) were determined over a 13 months period. In particular, the community was partitioned into core (abundant and persistent taxa) and satellite (taxa with low abundance and persistence) constituents and the drivers of community assembly for each determined. β-diversity was exceptionally low across the 140 m line transects, and there was limited evidence of geographical scaling effects on the composition of the core, satellite or combined communities. However, AMF richness and community composition changed over time associated with fluctuation within both the core and satellite communities. The degree to which AMF community variation was explained by soil properties was consistently higher in the core community than the combined and satellite communities, suggesting that the satellite community had considerable stochasticity associated with it. We suggest that the partitioning of communities into their core and satellite constituents could be employed to enhance the variation explained within microbial community analyses.

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Disentangling seasonal bacterioplankton population dynamics by high‐frequency sampling

Cited by 124 publications

References 63 publications

Cell-free extracellular enzymatic activity is linked to seasonal temperature changes: a case study in the Baltic Sea

Cell-free extracellular enzymatic activity is linked to seasonal temperature changes: a case study in the Baltic Sea

Phylogenetic Signals of Salinity and Season in Bacterial Community Composition Across the Salinity Gradient of the Baltic Sea

Spatio-Temporal Variation of Core and Satellite Arbuscular Mycorrhizal Fungus Communities in Miscanthus giganteus

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