The scale dependence of fungal community distribution in paddy soil driven by stochastic and deterministic processes

Zhao, Jianshu; Gao, Qun; Zhou, Jizhong; Wang, Mengmeng; Liang, Yuting; Sun, Bo; Chu, Haiyan; Yang, Yunfeng

doi:10.1016/j.funeco.2019.07.010

Cited by 36 publications

(26 citation statements)

References 58 publications

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“…In addition, we observed a scale-dependent distance-decay relationship between community similarity and geographic distance in picophytoplankton communities (Fig. 4), which is similar to observations in bacterial [43] and fungal communities [44]. However, our results were in agreement with a previous study [45] demonstrating that environmental variables were more important than geographic distance on a regional scale ( Fig.…”

Section: Drivers Of Alpha and Beta Diversity In Picophytoplankton Comsupporting

confidence: 91%

Trophic States Regulate Assembly Processes and Network Structures of Picophytoplankton Communities in Subtropical Coastal Ecosystems

Chen

Zhao

Jiang

et al. 2020

Preprint

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Background: Long-term coastal eutrophication especially in semi-enclosed marine areas is driven by increased amounts of nutrients derived from anthropogenic activities. Given that accelerating nutrients may constitute a strong environmental filter, understanding the diversity, assembly process and co-occurrence pattern of picophytoplankton communities in response to increasing coastal eutrophication is clearly of great importance. Results: We investigated picophytoplankton community changes using rbcL gene amplicon sequencing. The results exhibited that the alpha diversity (ANOVA, p < 0.001) and beta diversity (ANOSIM, p < 0.001) were significantly different among eutrophic states. Further, phylogenetic based β-nearest taxon distance analyses revealed that stochastic processes mainly provided 69.26% contribution to picophytoplankton community assembly, whereas deterministic processes dominated community assembly in a heavy eutrophic state. Integrated co-occurrence networks modularly responded to eutrophic states and revealed that keystone taxa mainly belonged to the oligo eutrophic group, which may play fundamental roles in network persistence. Importantly, increased environmental disturbances, such as nitrogen and phosphorus nutrients, could alter picophytoplankton community structure and disrupt ecological processes. Conclusion: Stochastic and deterministic processes simultaneously influenced the assembly of picophytoplankton communities in the subtropical coastal ecosystems. Eutrophic disturbances alert the assembly processes and network structures of picophytoplankton community. Our findings promote the understanding of fundamental ecological processes along eutrophic gradients in subtropical coastal ecosystems.

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Section: Drivers Of Alpha and Beta Diversity In Picophytoplankton Comsupporting

confidence: 91%

Trophic States Regulate Assembly Processes and Network Structures of Picophytoplankton Communities in Subtropical Coastal Ecosystems

Chen

Zhao

Jiang

et al. 2020

Preprint

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“…In other words, high nutrient input could reduce beta diversity driven by phytoplankton competition. In addition, we observed a scale-dependent distance-decay relationship between community similarity and geographic distance in SCP communities (Figure 4), which is similar to observations in bacterial (Martiny et al, 2011) and fungal communities (Zhao et al, 2019). However, our results were in agreement with a previous study (Santos et al, 2016) demonstrating that environmental variables were more important than geographic distance on a regional scale (Figure 4 and Table 1).…”

Section: Drivers Of Alpha and Beta Diversity In Scp Communitiessupporting

confidence: 91%

Trophic states regulate assembly processes and network structures of small chromophytic phytoplankton communities in subtropical coastal ecosystem

Chen

Zhao

Jiang

et al. 2020

Preprint

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Small chromophytic phytoplankton (SCP) are anticipated to be more important for a significant proportion of primary production in estuarine-coastal ecosystems. However, responses of SCP community to coastal eutrophication are still unclear. In this study, we investigated diversity, co-occurrence and assembly features of SCP communities, as well as their relationship with environmental factors in the subtropical Beibu Gulf. The results exhibited that the alpha diversity (ANOVA, p < 0.001) and beta diversity (ANOSIM, p < 0.001) of SCP communities were significantly different among eutrophic states. Co-occurrence network analysis revealed a complex interaction between SCP community and environmental factors. Most ASVs in modules of the network were specific to trophic states. Further, phylogenetic based β-nearest taxon distance analyses revealed that stochastic processes mainly provided 69.26% contribution to SCP community assembly, whereas deterministic processes dominated community assembly in a heavy eutrophic state. Importantly, increased environmental disturbances, such as nitrogen and phosphorus nutrients, could alter SCP community structure and disrupt ecological processes. Overall, our findings elucidate the mechanism of diversity and assembly in marine SCP community and promote the understanding of SCP ecology related to subtropical coastal eutrophication.

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“…Additionally, the hyphal networks, forming between fungi and the roots of their hosts, limit the dispersion of fungal species (i.e., dispersal limitation), since most of the dominant trees in the forest are ectomycorrhizal or arbuscular mycorrhizae [39,63]. In general, our results are supported by prior studies reporting that stochastic processes predominate in fungal community assembly [13,18,21]. Furthermore, the neutral community model explained a relatively large fraction (R 2 > 0.5) of fungal community variation, indicating that the fungal community was more influenced by neutral (or stochastic) processes.…”

Section: Soil Fungal Community Assembly Was Mainly Shaped By Stochastsupporting

confidence: 86%

“…It is now widely recognized that microbial community assembly is often determined by both deterministic and stochastic processes [11][12][13]. The deterministic processes mainly include selection via environmental filtering and biotic interactions.…”

Section: Introductionmentioning

confidence: 99%

How Do N Addition Affect Soil Fungal Community Assembly: Short- Versus Long-term Effects?

Jiao

Tan

et al. 2020

Preprint

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Background: Soil fungi play critical roles in ecosystem processes and are sensitive to global changes. Elevated atmospheric nitrogen (N) deposition has been well documented to impact on fungal diversity and community composition, but how fungal community assembly respond to short- and long-term simulative N deposition remains poorly understood. Here, we carried out two field experiments to investigate the soil fungal community variations and assembly processes under short- (2 years) versus long-term (13 years) exogenous nitrogen addition (100 kg N ha-1 yr-1) in a N-rich tropical forest of China. Results: We observed that short-term N addition significantly increased fungal taxonomic and phylogenetic α-diversity, and shifted fungal community composition with significant increases in the relative abundance of Ascomycota and saprotrophic fungi, and decreases in the relative abundance of Basidiomycota and ectomycorrhizal (EcM) fungi. However, unremarkable effects were found under long-term N addition. The variations of fungal α-diversity, community composition, the relative abundance of major phyla, genera and functional guilds were mainly correlated with soil pH and the concentrations of NO3--N, and these correlations were much stronger under short- than long-term N addition. The results of null, neutral community models and the 39 normalized stochasticity ratio (NST) index consistently revealed that stochastic processes played predominant roles in the assembly of soil fungal community under N addition in the tropical forest, and that the relative contributions of stochastic processes were higher at short-term site. Furthermore, both short- and long-term N addition slightly loosened the co-occurrence networks of the fungal community. Conclusions: These findings highlighted that the responses of fungal community structure to N addition were duration-dependent, i.e., the fungal community was sensitive to the short-term N addition but become acclimatized to long-term N enrichment.

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The scale dependence of fungal community distribution in paddy soil driven by stochastic and deterministic processes

Cited by 36 publications

References 58 publications

Trophic States Regulate Assembly Processes and Network Structures of Picophytoplankton Communities in Subtropical Coastal Ecosystems

Trophic States Regulate Assembly Processes and Network Structures of Picophytoplankton Communities in Subtropical Coastal Ecosystems

Trophic states regulate assembly processes and network structures of small chromophytic phytoplankton communities in subtropical coastal ecosystem

How Do N Addition Affect Soil Fungal Community Assembly: Short- Versus Long-term Effects?

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