scholarly journals Neutral processes and species sorting in benthic microalgal community assembly: effects of tidal resuspension

2016 ◽  
Vol 52 (5) ◽  
pp. 827-839 ◽  
Author(s):  
Craig J. Plante ◽  
Virginia Fleer ◽  
Martin L. Jones
Keyword(s):  
Community Assembly ◽  
Species Sorting ◽  
Neutral Processes ◽  
Microalgal Community

scholarly journals Advances, challenges and a developing synthesis of ecological community assembly theory

2011 ◽  
Vol 366 (1576) ◽  
pp. 2403-2413 ◽  
Author(s):  
Evan Weiher ◽  
Deborah Freund ◽  
Tyler Bunton ◽  
Artur Stefanski ◽  
Tali Lee ◽  
...  
Keyword(s):  
Community Assembly ◽  
Common Ground ◽  
Environmental Gradients ◽  
Environmental Filtering ◽  
Relative Importance ◽  
Species Sorting ◽  
Neutral Processes ◽  
Multiple Processes ◽  
Niche Assembly

Ecological approaches to community assembly have emphasized the interplay between neutral processes, niche-based environmental filtering and niche-based species sorting in an interactive milieu. Recently, progress has been made in terms of aligning our vocabulary with conceptual advances, assessing how trait-based community functional parameters differ from neutral expectation and assessing how traits vary along environmental gradients. Experiments have confirmed the influence of these processes on assembly and have addressed the role of dispersal in shaping local assemblages. Community phylogenetics has forged common ground between ecologists and biogeographers, but it is not a proxy for trait-based approaches. Community assembly theory is in need of a comparative synthesis that addresses how the relative importance of niche and neutral processes varies among taxa, along environmental gradients, and across scales. Towards that goal, we suggest a set of traits that probably confer increasing community neutrality and regionality and review the influences of stress, disturbance and scale on the importance of niche assembly. We advocate increasing the complexity of experiments in order to assess the relative importance of multiple processes. As an example, we provide evidence that dispersal, niche processes and trait interdependencies have about equal influence on trait-based assembly in an experimental grassland.

scholarly journals Water quality drives the regional patterns of an algal metacommunity in interconnected lakes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Min Sung Kim ◽  
Seok Hyun Ahn ◽  
In Jae Jeong ◽  
Tae Kwon Lee
Keyword(s):  
Water Quality ◽  
Community Assembly ◽  
River Flow ◽  
Geographical Area ◽  
Oxygen Demand ◽  
Algal Community ◽  
Regional Patterns ◽  
Algal Communities ◽  
Species Sorting ◽  
Metacommunity Structure

AbstractThe metacommunity approach provides insights into how the biological communities are assembled along the environmental variations. The current study presents the importance of water quality on the metacommunity structure of algal communities in six river-connected lakes using long-term (8 years) monitoring datasets. Elements of metacommunity structure were analyzed to evaluate whether water quality structured the metacommunity across biogeographic regions in the riverine ecosystem. The algal community in all lakes was found to exhibit Clementsian or quasi-Clementsian structure properties such as significant turnover, grouped and species sorting indicating that the communities responded to the environmental gradient. Reciprocal averaging clearly classified the lakes into three clusters according to the geographical region in river flow (upstream, midstream, and downstream). The dispersal patterns of algal genera, including Aulacoseira, Cyclotella, Stephanodiscus, and Chlamydomonas across the regions also supported the spatial-based classification results. Although conductivity, chemical oxygen demand, and biological oxygen demand were found to be important variables (loading > |0.5|) of the entire algal community assembly, water temperature was a critical factor in water quality associated with community assembly in each geographical area. These results support the notion that the structure of algal communities is strongly associated with water quality, but the relative importance of variables in structuring algal communities differed by geological regions.

scholarly journals Historical contingency impacts on community assembly and ecosystem function in chemosynthetic marine ecosystems

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dimitri Kalenitchenko ◽  
Erwan Peru ◽  
Pierre E. Galand
Keyword(s):  
Community Assembly ◽  
Sea Water ◽  
Marine Ecosystem ◽  
Marine Ecosystems ◽  
Metagenomic Sequencing ◽  
Historical Contingency ◽  
Historical Events ◽  
Species Sorting ◽  
Environmental Selection ◽  
Microbial Community Assembly

AbstractPredicting ecosystem functioning requires an understanding of the mechanisms that drive microbial community assembly. Many studies have explored microbial diversity extensively and environmental factors are thought to be the principal drivers of community composition. Community assembly is, however, also influenced by past conditions that might affect present-day assemblages. Historical events, called legacy effects or historical contingencies, remain poorly studied in the sea and their impact on the functioning of the communities is not known. We tested the influence, if any, of historical contingencies on contemporary community assembly and functions in a marine ecosystem. To do so, we verified if different inoculum communities colonizing the same substrate led to communities with different compositions. We inoculated wood with sea water microbes from different marine environments that differ in ecological and evolutionary history. Using 16S rRNA and metagenomic sequencing, it was demonstrated that historical contingencies change the composition and potential metabolisms of contemporary communities. The effect of historical events was transient, dominated by environmental selection as, over time, species sorting was a more important driver of community assembly. Our study shows not only that historical contingencies affect marine ecosystems but takes the analysis a step further by characterizing this effect as strong but transient.

scholarly journals Ecosystem size-induced environmental fluctuations affect the temporal dynamics of community assembly mechanisms

2022 ◽  
Author(s):  
Raven L Bier ◽  
Máté Vass ◽  
Anna J Székely ◽  
Silke Langenheder
Keyword(s):  
Community Assembly ◽  
Temporal Dynamics ◽  
Bacterial Community Composition ◽  
Dispersal Limitation ◽  
Priority Effects ◽  
Environmental Fluctuation ◽  
Species Sorting ◽  
Ecosystem Size ◽  
Environmental Fluctuations ◽  
Over Time

Understanding processes that determine community membership and abundance is important for many fields from theoretical community ecology to conservation. However, spatial community studies are often conducted only at a single timepoint despite the known influence of temporal variability on community assembly processes. Here we used a spatiotemporal study to determine how environmental fluctuation differences induced by mesocosm volumes (larger volumes were more stable) influence assembly processes of aquatic bacterial metacommunities along a press disturbance gradient. By combining path analysis and network approaches, we found mesocosm size categories had distinct relative influences of assembly process and environmental factors that determined spatiotemporal bacterial community composition, including dispersal and species sorting by conductivity. These processes depended on, but were not affected proportionately by, mesocosm size. Low fluctuation, large mesocosms primarily developed through the interplay of species sorting that became more important over time and transient priority effects as evidenced by more time-delayed associations. High fluctuation, small mesocosms had regular disruptions to species sorting and greater importance of ecological drift and dispersal limitation indicated by lower richness and higher taxa replacement. Together, these results emphasize that environmental fluctuations influence ecosystems over time and its impacts are modified by biotic properties intrinsic to ecosystem size.

scholarly journals The Relative Importance of Niche Process and Neutral Process in the Community Assembly of Subtropical Karst Forest: A Perspective on the Changes of Species Distribution Patterns at Different Scales

2021 ◽  
Author(s):  
Yan He ◽  
Yong Jiang ◽  
Hongling Lin ◽  
Yuanfang Pan ◽  
Shichu Liang ◽  
...  
Keyword(s):  
Community Assembly ◽  
Variation Partitioning ◽  
Species Abundance ◽  
Distribution Patterns ◽  
Relative Importance ◽  
Ecological Processes ◽  
Abundance Pattern ◽  
Karst Forest ◽  
Neutral Processes ◽  
Neutral Process

Abstract Background and aimsThe importance of niche processes and neutral processes to community assembly has been affirmed by most studies, although their relative importance needs to be determined in many systems. Moreover, as the spatial scale changes, the ecological processes that determine the community pattern may differ. We tested these ideas in subtropical karst forest in southwestern China in order to aid efforts of community reconstruction.MethodsTo test the importance of niche-based and neutral mechanisms we compared the fit six models to the observed SAD of the plot at three different sampling scales (10 m × 10 m, 20 m × 20 m, 50 m × 50 m). We also used spatial autocorrelation and distance-based Moran's eigenvector maps (dbMEM) combined with variation partitioning to further determine the relative contribution of the niche process and the neutral process under different sampling scales.ResultsThe neutral theoretical and statistical models fit the observed species abundance distribution curve best at each sampling scale. And variation partitioning showed that although the contribution of spatial structure was lower at larger sampling scales, it was still important, suggesting that neutral processes drive community structure at all sampling scales. In contrast, habitat filtering and interspecies competition may lead to a net weakening of the contribution of the niche process to the species abundance pattern of the community because they act in opposite directions. ConclusionsIn the restoration and reconstruction of local karst forest communities, environmental heterogeneity, inter-species relationships, and geographic spatial differences should all be considered.

scholarly journals The yellow perch (Perca flavescens) microbiome revealed resistance to colonisation mostly associated with neutralism driven by rare taxa under cadmium disturbance

2020 ◽  
Author(s):  
Bachar Cheaib ◽  
Hamza Seghouani ◽  
Martin Stephen Llewellyn ◽  
Katherine Vandal-Lenghan ◽  
Pierre-Luc Mercier ◽  
...  
Keyword(s):  
Community Assembly ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Microbial Interactions ◽  
Skin Microbiome ◽  
Free Living ◽  
Rare Taxa ◽  
Neutral Processes ◽  
Abundant Otus ◽  
The Impact

Abstract Background: Disentangling the dynamics of microbial interactions within communities improves our comprehension of metacommunity assembly of microbiota during host development and under perturbations. To assess the impact of stochastic variation of neutral processes on microbiota structure and composition under disturbance, two types of microbial habitats, free-living (water), and host-associated (skin and gut) were experimentally exposed to either a constant or gradual selection regime exerted by two sublethal cadmium chloride dosages (CdCl2). Yellow Perch (Perca flavescens) was used as a piscivorous ecotoxicological model. Using 16S rDNA gene based metataxonomics, quantitative metrics of water, skin and gut microbial communities were characterized along with development and across experimental conditions. Results: After 30 days, constant and gradual selection regimes drove a significant alpha diversity increase for both skin and gut microbiota. In the skin, pervasive negative correlations between taxa in both selection regimes in addition to the taxonomic convergence with the environmental bacterial community, suggest a loss of colonisation resistance resulting in the dysbiosis of yellow perch microbiota. Furthermore, the network connectivity in gut microbiome was exclusively maintained by rare (low abundance) OTUs, while most abundant OTUs were mainly composed of opportunistic invaders such as Mycoplasma and other genera related to fish pathogens such as Flavobacterium. Finally, the mathematical modelling of community assembly using both non-linear least squares models (NLS) and normalized stochasticity ratios (NST) based beta-diversity distances suggested neutral processes drove by taxonomic drift in host and water communities for almost all treatments. The NLS models predicted higher stochasticity in the cadmium-free host and water communities, however, NST models suggested higher stochasticity ratios under disturbance. Conclusions: Neutral models agree that water and host-microbiota assembly promoted by the occurrence frequence of rare taxa have evolved predominantly under neutral processes with potential involvement of deterministic forces sourced from host filtering and cadmium selection. The early signals of perturbations in the skin microbiome revealed antagonistic interactions by preponderance of negative correlations in the co-abundace networks. Our findings enhance our understanding of community assembly host-associated and free-living under anthropogenic selective pressure.

scholarly journals Priority effects and species sorting in a long paleoecological record of repeated community assembly through time

Ecology ◽  
2011 ◽  
Vol 92 (12) ◽  
pp. 2267-2275 ◽  
Author(s):  
Joachim Mergeay ◽  
Luc De Meester ◽  
Hilde Eggermont ◽  
Dirk Verschuren
Keyword(s):  
Community Assembly ◽  
Priority Effects ◽  
Species Sorting

scholarly journals Community assembly in Lake Tanganyika cichlid fish: quantifying the contributions of both niche-based and neutral processes

2017 ◽  
Vol 7 (4) ◽  
pp. 1057-1067 ◽  
Author(s):  
Thijs Janzen ◽  
Adriana Alzate ◽  
Moritz Muschick ◽  
Martine E. Maan ◽  
Fons van der Plas ◽  
...  
Keyword(s):  
Community Assembly ◽  
Lake Tanganyika ◽  
Cichlid Fish ◽  
Neutral Processes

scholarly journals Environmental species sorting dominates forest-bird community assembly across scales

2012 ◽  
Vol 82 (1) ◽  
pp. 266-274 ◽  
Author(s):  
Korhan Özkan ◽  
Jens-Christian Svenning ◽  
Erik Jeppesen
Keyword(s):  
Community Assembly ◽  
Bird Community ◽  
Species Sorting ◽  
Forest Bird
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