Seasonal changes driving shifts in microbial community assembly and species coexistence in an urban river

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 905, P. 167027 - 167027

Published: Sept. 17, 2023

Language: Английский

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Ecological drivers shaping mainstem and tributary fish communities in the upper Jinsha River, southeastern Qinghai-Tibet Plateau

Ecological Processes, Journal Year: 2025, Volume and Issue: 14(1)

Published: Jan. 2, 2025

Abstract Background Elucidating spatial variation in ecological communities and the mechanisms of community assembly is crucial for biodiversity conservation river ecosystems. The upper Jinsha River located eastern part Qinghai-Tibet Plateau, experiencing intensified human activities, such as hydropower development. In this study, fish surveys were conducted at 38 sites, including 15 mainstem sites 23 tributary River, China, to analyze patterns drivers communities. Results NMDS PERMANOVA analysis revealed significant disparities between tributaries. Schizothorax dolichonema Schizopygopsis malacanthus dominated mainstem, whereas , wangchiachii Triplophysa stenura Fish beta diversity exhibited substantial turnover across tributaries, entire basin. Both environmental factors (e.g., altitude proportion cobble substrate) variables significantly correlated with diversity, but their relative importance differed Specifically, emerged primary drivers. contrast, assumed a predominant role Conclusions results suggested that filtering predominantly drove dispersal limitation exerted had greater influence on These contribute our understanding formation assemblages tributaries high-altitude rivers, River. context development findings offer insights into management diversity.

Language: Английский

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Identifying conservation priority areas using spatial phylogenetic approaches in west Himalaya

Pakistan Journal of Botany, Journal Year: 2024, Volume and Issue: 56(3)

Published: Jan. 1, 2024

Human society is at a critical point in biodiversity conservation.Assessing spatiotemporal patterns provides vital insights into the evolutionary and ecological dynamics.Using comprehensive metrics, including species richness (SR), phylogenetic diversity (PD), endemism (PE), weighted (WE), standardize effect size of PD (SES.PD), we explored spatial links shaping West Himalayan flora.Our analyses employed species-level tree 7,722 vascular plant 116,986 distribution records.Observed variations SR, PD, SES.PD, PE, WE highlight key areas: Wakhan (Afghanistan), northern regions Azad Kashmir (Pakistan), northwestern zones like Jammu (India), Nepal's western areas (e.g., Bhajang to Mustang).Our net relatedness index (NRI) nearest taxon (NTI) also emphasized these regions, revealing sign significant lineages with unique histories.Ultimately, hotspot analysis identified 19 conservation priority areas, covering 78% total regions.Amid rising anthropogenic climate challenges, assessments offer patterns, guiding future monitoring policies strategies.

Language: Английский

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Seasonal succession of microbial community co-occurrence patterns and community assembly mechanism in coal mining subsidence lakes

Frontiers in Microbiology, Journal Year: 2023, Volume and Issue: 14

Published: Feb. 3, 2023

Coal mining subsidence lakes are classic hydrologic characteristics created by underground coal and represent severe anthropogenic disturbances environmental challenges. However, the assembly mechanisms diversity of microbial communities shaped such environments poorly understood yet. In this study, we explored aquatic bacterial community ecological processes in during winter summer using 16S rRNA gene sequencing. We observed that clear structure was driven seasonality more than habitat, α-diversity functional were significantly higher (p < 0.001). Canonical correspondence analysis indicated temperature chlorophyll-a most crucial contributing factors influencing season variations lakes. Specifically, explained 18.26 14.69% variation, respectively. The variation deterministic but dominated stochastic summer. Compared to winter, network exhibited a average degree, modularity, keystone taxa (hubs connectors network), thereby forming highly complex stable structure. These results illustrate heterogeneity provide new insights into revealing effects seasonal succession on lake ecosystems.

Language: Английский

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Urbanization drives biotic homogenization of the avian community in China

Integrative Zoology, Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 20, 2024

Abstract Urbanization‐driven biotic homogenization has been recorded in various ecosystems on local and global scales; however, it is largely unexplored developing countries. Empirical studies different taxa bioregions show conflicting results (i.e. vs. differentiation); the extent to which community composition changes response anthropogenic disturbances factors governing this process, therefore, require elucidation. Here, we used a compiled database of 760 bird species China quantify multiple‐site β‐diversity fitted distance decay pairwise β‐diversities between natural urban assemblages assess whether urbanization had driven homogenization. We generalized dissimilarity models (GDM) elucidate roles spatial environmental avian dissimilarities before after urbanization. The among were markedly lower than those assemblages, decays similarities more rapid. These consistent taxonomic, phylogenetic, functional aspects, supporting general by GDM indicated that geographical temperature dominant predictors dissimilarity. However, contribution climatic decreased explaining compositional assemblages. Geographical distances accounted for much variations implying potential risk uncertainty model predictions under further climate change disturbances. Our study concludes dimensions urbanization‐driven China.

Language: Английский

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Distinguishing the mechanisms driving multifaceted plant diversity in subtropical reservoir riparian zones

Frontiers in Plant Science, Journal Year: 2023, Volume and Issue: 14

Published: Feb. 24, 2023

Understanding the multifaceted plant diversity and its maintenance mechanisms is crucial for biodiversity conservation. Dam-induced water level fluctuations dramatically alter various aspects of riparian diversity, such as taxonomic (TD), phylogenetic (PD), or functional (FD) diversity. However, few studies simultaneously evaluated TD, FD, PD, especially in subtropical reservoir zone. Here we sampled environmental drivers along inundation gradients Three Gorges Reservoir Region China. We integrated to assess how distinct ecological processes affect community assembly they respond gradients, spatial variability, climate, soils dam-regulated zones. found that alpha FD exhibited decreasing trends with increasing significant positive correlations soil organic matter. The number clustering communities increases gradients. Beta TD PD were mainly dominated by species turnover fewer contributions from nestedness, while beta was nestedness turnover. explainable rates different dimensions turnover, ranged 11% 61%, factors explaining highest dimensions, followed properties, climate variables. Our results suggest dispersal limitations are more important zones at regional scales, fertility critical shaping assemblages local scale. This study emphasizes understanding driving scales reinforces importance protecting seed sources pathways maintaining river connectivity when implementing restoration projects.

Language: Английский

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Vegetation as a key driver of the distribution of microbial generalists that in turn shapes the overall microbial community structure in the low Arctic tundra

Environmental Microbiome, Journal Year: 2023, Volume and Issue: 18(1)

Published: May 10, 2023

Abstract Understanding the variability of microbial niches and their interaction with abiotic biotic factors in Arctic can provide valuable insights into adaptations to extreme environments. This study investigates structure diversity soil bacterial communities obtained from sites varying vegetation coverage biogeochemical properties low tundra explores how bacteria interact under different environmental parameters. Our findings reveal differences composition abundance among three niche breadths (specialists, common taxa, generalists). Co-occurrence network analysis revealed Rhizobiales Ktedonobacterales as keystone taxa that connect support other microbes habitat. Low-elevation indicators, such vascular plants moisture content, were correlated two out generalist modular hubs linked a large proportion generalists’ distribution (18%). Structural equation modeling distribution, which influenced remaining communities, was mainly regulated by well factors. These results suggest elevation-dependent directly influence community module formation through regulation distribution. Furthermore, generalists affected macroenvironment filtering, whereas specialists microenvironment filtering (species-engineered construction). In summary, our highlight strong top–down control exerted on turn shapes overall tundra.

Language: Английский

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Tibetan terrestrial and aquatic ecosystems collapsed with cryosphere loss inferred from sedimentary ancient metagenomics

Science Advances, Journal Year: 2024, Volume and Issue: 10(21)

Published: May 23, 2024

Glacier and permafrost shrinkage land-use intensification threaten mountain wildlife affect nature conservation strategies. Here, we present paleometagenomic records of terrestrial aquatic taxa from the southeastern Tibetan Plateau covering last 18,000 years to help understand complex alpine ecosystem dynamics. We infer that steppe-meadow became woodland at 14 ka (cal BP) controlled by cryosphere loss, further driving a herbivore change wild yak deer. These findings weaken hypothesis top-down control large herbivores in ecosystem. find turnover communities ka, transitioning glacier-related (blue-green) algae abundant nonglacier-preferring picocyanobacteria, macrophytes, fish, otters. There is no evidence for substantial effects livestock herding either Using network analysis, assess stress-gradient reveal root hemiparasitic cushion plants are keystone taxa. With ongoing protection their habitats likely be benefit on Plateau.

Language: Английский

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Sulfate and pH drive microbial assembly and coexistence in hyporheic zone contaminated by acid coal mine drainage

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 132703 - 132703

Published: Jan. 1, 2025

Language: Английский

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The co-occurrence patterns and assembly mechanisms of microeukaryotic communities in geothermal ecosystems of the Qinghai-Tibet Plateau

Frontiers in Microbiology, Journal Year: 2025, Volume and Issue: 16

Published: Feb. 4, 2025

Geothermal spring ecosystems, as extreme habitats, exert significant environmental pressure on their microeukaryotic communities. However, existing studies the stability of communities in geothermal ecosystems across different habitats and temperature gradients are still limited. In this study, we used high-throughput 18S rDNA sequencing combination with factor analysis to investigate co-occurrence patterns, assembly mechanisms, responses changes sediment water samples from 36 springs southern Tibet. The results show that increasing temperature, network sediments significantly improved, while decreased. mechanisms both were primarily driven by undominant processes within stochastic processes. Latitude longitude key factors influencing community composition, electrical conductivity major affecting composition. Additionally, was closely related its response external disturbances: communities, being relatively stable environments, demonstrated higher resistance disturbances, whereas influenced such flow precipitation, exhibited greater dynamic variability. These findings not only enhance our understanding ecological adaptability but also provide valuable insights into how microorganisms environments respond disturbances. This is especially for maintain under highly stressful conditions.

Language: Английский

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