Trophic complexity in aqueous systems: bacterial species richness and protistan predation regulate dissolved organic carbon and dissolved total nitrogen removal

Saleem, Muhammad; Fetzer, Ingo; Harms, Hauke; Chatzinotas, Antonis

doi:10.1098/rspb.2015.2724

Cited by 37 publications

(26 citation statements)

References 60 publications

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“…With the results of C mic as well as total phospholipid-derived fatty acids from Chang and Chiu [16] in a parallel study, C mic content was found the highest in cedar plantation soils. This finding could be evidence that increasing S b OC content benefits microbial growth [32]. Moreover, C mic content was positively correlated with S b OC content and TOC in this study, so S b OC content may be derived from the decomposition of soil TOC as a result of microbial activity [32].…”

Section: Discussionsupporting

confidence: 55%

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Changes in Soil Biochemical Properties in a Cedar Plantation Invaded by Moso Bamboo

Shiau

Chiu

2017

Forests

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Moso bamboo (Phyllostachys edulis) is one of the widely growing bamboo species in Asia. Because of its fast growth and aggressive rhizomes, it is reported to invade other forests and reduce the biodiversity of forest ecosystems. To determine the changes in soil nutrient conditions due to moso bamboo invasion, this research measured the difference in soil labile carbon (C) and nitrogen (N) contents in a Japanese cedar (Cryptomeria japonica) forest invaded by moso bamboo in central Taiwan. The content of soluble organic C (S b OC), measured by both KCl and hot-water extraction methods, was lower in bamboo than cedar soils. This observation agreed with the finding that the more easily decomposed S b OC could be lost with bamboo invasion. In addition, both S b OC KCl and S b OC HW contents were positively correlated with microbial biomass C content, so the decreased labile organic C content in bamboo soils may reduce microbial biomass production. Principal component analysis revealed soil organic C content (total organic C, S b OC and acid-hydrolysable C) as the most important soil parameter affected by the bamboo invasion, followed by microbial biomass N and NO 3 − contents in soils. The soil quality index model also agreed with the degraded soil quality with bamboo invasion. In conclusion, the invasion of moso bamboo reduced the C and N pools in bamboo soil and degraded the overall soil quality.

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Section: Discussionsupporting

confidence: 55%

“…This finding could be evidence that increasing S b OC content benefits microbial growth [32]. Moreover, C mic content was positively correlated with S b OC content and TOC in this study, so S b OC content may be derived from the decomposition of soil TOC as a result of microbial activity [32].…”

Section: Discussionsupporting

confidence: 55%

Changes in Soil Biochemical Properties in a Cedar Plantation Invaded by Moso Bamboo

Shiau

Chiu

2017

Forests

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“…The ECS features a wide gradient of microbial diversity owing to the substantial environmental variations from coastal to oceanic regions [36,37]. Regarding trophic interaction, the grazing effect of nanoflagellates on bacterial biomass has been studied in the ECS [38], and has potentially profound impacts on biogeochemical cycling and energy transfer through the microbial loop [39][40][41]. Clear biodiversity effects on the trophic interaction between protist and bacterial communities had been examined in laboratory experiments [42,43].…”

Section: Introductionmentioning

confidence: 99%

Predator and prey biodiversity relationship and its consequences on marine ecosystem functioning—interplay between nanoflagellates and bacterioplankton

Yang

Chung

et al. 2018

The ISME Journal

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The importance of biodiversity effects on ecosystem functioning across trophic levels, especially via predatory-prey interactions, is receiving increased recognition. However, this topic has rarely been explored for marine microbes, even though microbial biodiversity contributes significantly to marine ecosystem function and energy flows. Here we examined diversity and biomass of bacteria (prey) and nanoflagellates (predators), as well as their effects on trophic transfer efficiency in the East China Sea. Specifically, we investigated: (i) predator diversity effects on prey biomass and trophic transfer efficiency (using the biomass ratio of predator/prey as a proxy), (ii) prey diversity effects on predator biomass and trophic transfer efficiency, and (iii) the relationship between predator and prey diversity. We found higher prey diversity enhanced both diversity and biomass of predators, as well as trophic transfer efficiency, which may arise from more balanced diet and/or enhanced niche complementarity owing to higher prey diversity. By contrast, no clear effect was detected for predator diversity on prey biomass and transfer efficiency. Notably, we found prey diversity effects on predator-prey interactions; whereas, we found no significant diversity effect on biomass within the same trophic level. Our findings highlight the importance of considering multi-trophic biodiversity effects on ecosystem functioning in natural ecosystems.

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“…During the application of bacterial monocultures and mixtures, we used the substitutive experimental design to determine the impact of bacterial species richness on bacterial abundance and plant performance (Saleem et al, 2016a). While our bacterial species diversity level was simple (monoculture vs. mixture of three species); nevertheless, it has sufficient range to provide valuable insights into microbial interactions and their impacts on the plant-microbe performance.…”

Section: Methodsmentioning

confidence: 99%

Microbial Interactions in the Phyllosphere Increase Plant Performance under Herbivore Biotic Stress

et al. 2017

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The phyllosphere supports a tremendous diversity of microbes and other organisms. However, little is known about the colonization and survival of pathogenic and beneficial bacteria alone or together in the phyllosphere across the whole plant life-cycle under herbivory, which hinders our ability to understand the role of phyllosphere bacteria on plant performance. We addressed these questions in experiments using four genetically and biogeographically diverse accessions of Arabidopsis thaliana, three ecologically important bacterial strains (Pseudomonas syringae DC3000, Xanthomonas campestris, both pathogens, and Bacillus cereus, plant beneficial) under common garden conditions that included fungus gnats (Bradysia spp.). Plants supported greater abundance of B. cereus over either pathogenic strain in the phyllosphere under such greenhouse conditions. However, the Arabidopsis accessions performed much better (i.e., early flowering, biomass, siliques, and seeds per plant) in the presence of pathogenic bacteria rather than in the presence of the plant beneficial B. cereus. As a group, the plants inoculated with any of the three bacteria (Pst DC3000, Xanthomonas, or Bacillus) all had a higher fitness than uninoculated controls under these conditions. These results suggest that the plants grown under the pressure of different natural enemies, such as pathogens and an herbivore together perform relatively better, probably because natural enemies induce host defense against each other. However, in general, a positive impact of Bacillus on plant performance under herbivory may be due to its plant-beneficial properties. In contrast, bacterial species in the mixture (all three together) performed poorer than as monocultures in their total abundance and host plant growth promotion, possibly due to negative interspecific interactions among the bacteria. However, bacterial species richness linearly promoted seed production in the host plants under these conditions, suggesting that natural enemies diversity may be beneficial from the host perspective. Collectively, these results highlight the importance of bacterial community composition on plant performance and bacterial abundance in the phyllosphere.

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Trophic complexity in aqueous systems: bacterial species richness and protistan predation regulate dissolved organic carbon and dissolved total nitrogen removal

Cited by 37 publications

References 60 publications

Changes in Soil Biochemical Properties in a Cedar Plantation Invaded by Moso Bamboo

Changes in Soil Biochemical Properties in a Cedar Plantation Invaded by Moso Bamboo

Predator and prey biodiversity relationship and its consequences on marine ecosystem functioning—interplay between nanoflagellates and bacterioplankton

Microbial Interactions in the Phyllosphere Increase Plant Performance under Herbivore Biotic Stress

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