Seasonal differences in bacterial community composition following nutrient additions in a eutrophic lake

Newton, Ryan J.; McMahon, Katherine D.

doi:10.1111/j.1462-2920.2010.02387.x

Cited by 95 publications

(58 citation statements)

References 59 publications

(86 reference statements)

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“…Further, our findings are consistent with reports of microbial communities' responses to nutrient concentrations (Newton and McMahon 2011;Muscarella et al 2014). Nutrient availability plays a critical role in driving the activities and large-scale distributions of freshwater bacteria and phytoplankton communities (Yang et al 2012;Liu et al 2014).…”

Section: Spatiotemporal Patterns Of River Ecosystemsupporting

confidence: 93%

“…This is because these microorganisms constitute the major part of Earth's biomass and play an indispensable role in biogeochemical cycles and ecosystem functions (Fuhrman 2009;Newton and McMahon 2011;Freimann et al 2013;Liu et al 2013). Planktonic microorganisms exhibit complex responses to environmental disturbances and stresses that are manifested through variation at both the population and community levels (Beier et al 2008;Fuhrman 2009;Yang et al 2012;Chen et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal dynamics and determinants of planktonic bacterial and microeukaryotic communities in a Chinese subtropical river

Wang

Liu

Chen

et al. 2015

Appl Microbiol Biotechnol

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The spatiotemporal distribution of microbial diversity, community composition, and their major drivers are fundamental issues in microbial ecology. In this study, the planktonic bacterial and microeukaryotic communities of the Jiulong River were investigated across both wet and dry seasons by using denaturing gradient gel electrophoresis (DGGE). We found evidence of temporal change between wet and dry seasons and distinct spatial patterns of bacterial and microeukaryotic communities. Both bacterial and microeukaryotic communities were strongly correlated with temperature, NH4-N, PO4-P, and chlorophyll a, and these environmental factors were significant but incomplete predictors of microbial community composition. Local environmental factors combined with spatial and temporal factors strongly controlled both bacterial and microeukaryotic communities in complex ways, whereas the direct influence of spatial and temporal factors appeared to be relatively small. Path analysis revealed that the microeukaryotic community played key roles in shaping bacterial community composition, perhaps through grazing effects and multiple interactions. Both Betaproteobacteria and Actinobacteria were the most dominant and diverse taxa in bacterial communities, while the microeukaryotic communities were dominated by Ciliophora (zooplankton) and Chlorophyta (phytoplankton). Our results demonstrated that both bacterial and microeukaryotic communities along the Jiulong River displayed a distinct spatiotemporal pattern; however, microeukaryotic communities exhibited a stronger distance-decay relationship than bacterial communities and their spatial patterns were mostly driven by local environmental variables rather than season or spatial processes of the river. Therefore, we have provided baseline data to support further research on river microbial food webs and integrating different microbial groups into river models.

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Section: Spatiotemporal Patterns Of River Ecosystemsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Spatiotemporal dynamics and determinants of planktonic bacterial and microeukaryotic communities in a Chinese subtropical river

Wang

Liu

Chen

et al. 2015

Appl Microbiol Biotechnol

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“…The changes in community composition of both plankton communities following nutrient amendments were dependent on season, as has been previously reported for lake bacterioplankton [36] and for marine phytoplankton [37]. The bacterial communities in Alinen Mustajärvi appeared to be limited by N and P during spring and summer, but during autumn some other factor was limiting growth.…”

Section: Discussionsupporting

confidence: 76%

Bacterial and Phytoplankton Responses to Nutrient Amendments in a Boreal Lake Differ According to Season and to Taxonomic Resolution

et al. 2012

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Nutrient limitation and resource competition in bacterial and phytoplankton communities may appear different when considering different levels of taxonomic resolution. Nutrient amendment experiments conducted in a boreal lake on three occasions during one open water season revealed complex responses in overall bacterioplankton and phytoplankton abundance and biovolume. In general, bacteria were dominant in spring, while phytoplankton was clearly the predominant group in autumn. Seasonal differences in the community composition of bacteria and phytoplankton were mainly related to changes in observed taxa, while the differences across nutrient treatments within an experiment were due to changes in relative contributions of certain higher- and lower-level phylogenetic groups. Of the main bacterioplankton phyla, only Actinobacteria had a treatment response that was visible even at the phylum level throughout the season. With increasing resolution (from 75 to 99% sequence similarity) major responses to nutrient amendments appeared using 454 pyrosequencing data of 16S rRNA amplicons. This further revealed that OTUs (defined by 97% sequence similarity) annotated to the same highly resolved freshwater groups appeared to occur during different seasons and were showing treatment-dependent differentiation, indicating that OTUs within these groups were not ecologically coherent. Similarly, phytoplankton species from the same genera responded differently to nutrient amendments even though biovolumes of the majority of taxa increased when both nitrogen and phosphorus were added simultaneously. The bacterioplankton and phytoplankton community compositions showed concurrent trajectories that could be seen in synchronous succession patterns over the season. Overall, our data revealed that the response of both communities to nutrient changes was highly dependent on season and that contradictory results may be obtained when using different taxonomic resolutions.

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“…In our study, the composition and function of communities receiving biomolecule sources of P (PO 4 3− and ATP) were distinct from communities receiving nonbiomolecule sources of P (AEP and PA). These findings are consistent with reports of bacterial community responses to PO 4 3− and ATP treatments in Lake Mendota (Newton & McMahon 2011).…”

Section: The Biomolecule Model Of Microbial P-acquisitionsupporting

confidence: 83%

Phosphorus resource heterogeneity in microbial food webs

Muscarella¹,

Bird²,

Larsen³

et al. 2014

Aquat. Microb. Ecol.

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Food webs are often regulated by the bottom-up effects of resource supply rate. However, heterogeneity within a resource pool may also affect the structure and function of communities. To test this hypothesis, we measured the responses of aquatic microbial food webs in experimental mesocosms to the addition of 4 different phosphorus (P) sources: orthophosphate (PO 4 3− ), 2-aminoethylphosphonate (AEP), adenosine triphosphate (ATP), and phytic acid (PA). Based on 16S rRNA gene sequencing, we found that P resource heterogeneity altered community assembly for bacteria and eukaryotic algae, suggesting that these microbial functional groups may be comprised of P-specialists. In contrast, cyanobacteria were relatively unaffected by our treatments, suggesting that these microorganisms may adopt a more generalist strategy for Pacquisition. Furthermore, our results revealed that P resource heterogeneity affected food web and ecosystem attributes such as nutrient concentrations, bacterial productivity, algal biomass, and ecosystem respiration. Lastly, we found no evidence for non-additive effects of resource heterogeneity based on a treatment where a set of mesocosms received all 4 sources of P. Instead, our results support the view that there may be non-substitutable classes of P in aquatic ecosystems. Specifically, microbial food webs were more sensitive to P-containing biomolecules (PO 4 3− and ATP) than P-containing structural or storage molecules (AEP and PA). Our results demonstrate that not all P resources are the same; although historically overlooked, P resource heterogeneity may have important implications for understanding and predicting the structure and function of aquatic communities.

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Seasonal differences in bacterial community composition following nutrient additions in a eutrophic lake

Cited by 95 publications

References 59 publications

Spatiotemporal dynamics and determinants of planktonic bacterial and microeukaryotic communities in a Chinese subtropical river

Spatiotemporal dynamics and determinants of planktonic bacterial and microeukaryotic communities in a Chinese subtropical river

Bacterial and Phytoplankton Responses to Nutrient Amendments in a Boreal Lake Differ According to Season and to Taxonomic Resolution

Phosphorus resource heterogeneity in microbial food webs

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