scholarly journals Community metabarcoding reveals the relative role of environmental filtering and spatial processes in metacommunity dynamics of soil microarthropods across a mosaic of montane forests

2021 ◽  
Author(s):  
Víctor Noguerales ◽  
Emmanouil Meramveliotakis ◽  
Adrián Castro‐Insua ◽  
Carmelo Andújar ◽  
Paula Arribas ◽  
...  
Keyword(s):  
Environmental Filtering ◽  
Relative Role ◽  
Spatial Processes ◽  
Montane Forests ◽  
Soil Microarthropods ◽  
Metacommunity Dynamics

scholarly journals Community metabarcoding reveals the relative role of environmental filtering and dispersal in metacommunity dynamics of soil microarthropods across a mosaic of montane forests

2021 ◽  
Author(s):  
Victor Noguerales ◽  
Emmanouil Meramveliotakis ◽  
Adrián Castro-Insua ◽  
Carmelo Andujar ◽  
Paula Arribas ◽  
...  
Keyword(s):  
Environmental Filtering ◽  
Dispersal Limitation ◽  
Mountain Range ◽  
Relative Role ◽  
Primary Role ◽  
Soil Microarthropods ◽  
Diversity Patterns ◽  
Mountainous Regions ◽  
Metacommunity Structure

Disentangling the relative role of environmental filtering and dispersal limitation in driving metacommunity structure across mountainous regions remains challenging, as the way we quantify spatial connectivity in topographically and environmentally heterogeneous landscapes can influence our perception of which process predominates. More empirical datasets are required to account for taxon- and context-dependency but relevant research is often compromised by coarse taxonomic resolution. We here employed haplotype-level community DNA metabarcoding, enabled by stringent filtering of Amplicon Sequence Variants (ASVs), to characterize metacommunity structure of soil microarthropod assemblages across a mosaic of five forest habitats on the Troodos mountain range in Cyprus. We found similar β diversity patterns at ASV and species (OTU, Operational Taxonomic Unit) levels, which pointed to a primary role of habitat filtering resulting in the existence of largely distinct metacommunities linked to different forest types. Within-habitat turnover was correlated to topoclimatic heterogeneity, again emphasizing the role of environmental filtering. However, when integrating landscape matrix information for the highly fragmented Golden Oak habitat, we also detected a major role of dispersal limitation imposed by patch connectivity, indicating that stochastic and niche-based processes synergistically govern community assembly. Alpha diversity patterns varied between ASV and OTU levels, with OTU richness decreasing with elevation and ASV richness following a longitudinal gradient, potentially reflecting a decline of genetic diversity eastwards due to historical pressures. Our study demonstrates the utility of haplotype-level community metabarcoding for characterising metacommunity structure of complex assemblages and improving our understanding of biodiversity dynamics across mountainous landscapes worldwide.

scholarly journals Community metabarcoding reveals the relative role of environmental filtering and dispersal in metacommunity dynamics of soil microarthropods across a mosaic of montane forests

2021 ◽  
Author(s):  
Victor Noguerales ◽  
Emmanouil Meramveliotakis ◽  
Adrián Castro-Insua ◽  
Carmelo Andujar ◽  
Paula Arribas ◽  
...  
Keyword(s):  
Environmental Filtering ◽  
Dispersal Limitation ◽  
Mountain Range ◽  
Relative Role ◽  
Primary Role ◽  
Soil Microarthropods ◽  
Diversity Patterns ◽  
Mountainous Regions ◽  
Metacommunity Structure

Disentangling the relative role of environmental filtering and dispersal limitation in driving metacommunity structure across mountainous regions remains challenging, as the way we quantify spatial connectivity in topographically and environmentally heterogeneous landscapes can influence our perception of which process predominates. More empirical datasets are required to account for taxon- and context-dependency but relevant research is often compromised by coarse taxonomic resolution. We here employed haplotype-level community DNA metabarcoding, enabled by stringent filtering of Amplicon Sequence Variants (ASVs), to characterize metacommunity structure of soil microarthropod assemblages across a mosaic of five forest habitats on the Troodos mountain range in Cyprus. We found similar β diversity patterns at ASV and species (OTU, Operational Taxonomic Unit) levels, which pointed to a primary role of habitat filtering resulting in the existence of largely distinct metacommunities linked to different forest types. Within-habitat turnover was correlated to topoclimatic heterogeneity, again emphasizing the role of environmental filtering. However, when integrating landscape matrix information for the highly fragmented Golden Oak habitat, we also detected a major role of dispersal limitation imposed by patch connectivity, indicating that stochastic and niche-based processes synergistically govern community assembly. Alpha diversity patterns varied between ASV and OTU levels, with OTU richness decreasing with elevation and ASV richness following a longitudinal gradient, potentially reflecting a decline of genetic diversity eastwards due to historical pressures. Our study demonstrates the utility of haplotype-level community metabarcoding for characterising metacommunity structure of complex assemblages and improving our understanding of biodiversity dynamics across mountainous landscapes worldwide.

scholarly journals Disentangling the role of connectivity, environmental filtering, and spatial structure on metacommunity dynamics

Oikos ◽  
2013 ◽  
pp. no-no ◽  
Author(s):  
C. Moritz ◽  
C. N. Meynard ◽  
V. Devictor ◽  
K. Guizien ◽  
C. Labrune ◽  
...  
Keyword(s):  
Spatial Structure ◽  
Environmental Filtering ◽  
Metacommunity Dynamics

scholarly journals Metacommunities from bacteria to birds: stronger environmental effects in Mediterranean than in tropical ponds

2021 ◽  
Author(s):  
Ángel Gálvez ◽  
Pedro R. Peres-Neto ◽  
Andreu Castillo-Escrivà ◽  
Fabián Bonilla ◽  
Antonio Camacho ◽  
...  
Keyword(s):  
Environmental Effects ◽  
Environmental Gradients ◽  
Variation Partitioning ◽  
Generalized Additive Models ◽  
Environmental Filtering ◽  
Additive Models ◽  
Temporary Ponds ◽  
Relative Role ◽  
The Tropics

AbstractThe metacommunity concept provides a theoretical framework that aims at explaining organism distributions by a combination of environmental filtering, dispersal and drift. With the development of statistical tools to quantify and partially isolate the role of each of these processes, empirical metacommunity studies have multiplied worldwide. However, few works attempt a multi-taxon approach and even fewer compare two distant biogeographical regions using the same methodology. Under this framework, we tested the expectation that temperate (Mediterranean) pond metacommunities would be more influenced by environmental and spatial processes than tropical ones, because of stronger environmental gradients and higher isolation of waterbodies.We surveyed 30 tropical and 32 Mediterranean temporary ponds and obtained data on 49 environmental variables (including limnological, hydrogeomorphological, biotic, climatic, and landscape variables). We characterized the biological communities of Bacteria and Archaea (from the water column and the sediment), phytoplankton, zooplankton, benthic invertebrates, amphibians and birds, and estimated the relative role of space and environment on metacommunity organization for each group and region, by means of variation partitioning using Generalized Additive Models (GAMs).The residual (unexplained) variation was larger in tropical pond metacommunities, suggesting a higher role for stochastic processes and/or effects of unmeasured processes such as biotic interactions in the tropics. Environmental filtering was important in both tropical and Mediterranean ponds, but markedly stronger in the latter, probably related to higher environmental heterogeneity. The variability between taxonomic groups in spatial and environmental contributions was very wide, and only some similarities between geographic settings were observed for the environmental effects of passively dispersing organisms, with rotifers and diatoms being among the most and least affected by the abiotic environment, respectively, in both areas. Overall, these results provide support, in a wide variety of aquatic organisms, for the classical view of stronger abiotic niche constraints in temperate areas compared to the tropics.

scholarly journals Co-occurrences of tropical trees in eastern South America: disentangling abiotic and biotic forces

Plant Ecology ◽  
2021 ◽  
Author(s):  
Emma-Liina Marjakangas ◽  
Otso Ovaskainen ◽  
Nerea Abrego ◽  
Vidar Grøtan ◽  
Alexandre A. de Oliveira ◽  
...  
Keyword(s):  
South America ◽  
Tree Species ◽  
Large Scale ◽  
Environmental Filtering ◽  
Limiting Similarity ◽  
Phylogenetic Relatedness ◽  
Biogeographical Regions ◽  
Dependent Processes ◽  
Occurrence Of Species

AbstractSpecies co-occurrences in local communities can arise independent or dependent on species’ niches. However, the role of niche-dependent processes has not been thoroughly deciphered when generalized to biogeographical scales, probably due to combined shortcomings of data and methodology. Here, we explored the influence of environmental filtering and limiting similarity, as well as biogeographical processes that relate to the assembly of species’ communities and co-occurrences. We modelled jointly the occurrences and co-occurrences of 1016 tropical tree species with abundance data from inventories of 574 localities in eastern South America. We estimated species co-occurrences as raw and residual associations with models that excluded and included the environmental effects on the species’ co-occurrences, respectively. Raw associations indicate co-occurrence of species, whereas residual associations indicate co-occurrence of species after accounting for shared responses to environment. Generally, the influence of environmental filtering exceeded that of limiting similarity in shaping species’ co-occurrences. The number of raw associations was generally higher than that of the residual associations due to the shared responses of tree species to the environmental covariates. Contrary to what was expected from assuming limiting similarity, phylogenetic relatedness or functional similarity did not limit tree co-occurrences. The proportions of positive and negative residual associations varied greatly across the study area, and we found a significant tendency of some biogeographical regions having higher proportions of negative associations between them, suggesting that large-scale biogeographical processes limit the establishment of trees and consequently their co-occurrences.

scholarly journals The Role of Frost Processes in the Retreat of River Banks

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1812
Author(s):  
Karol Augustowski ◽  
Józef Kukulak
Keyword(s):  
Relative Role ◽  
Freezing And Thawing ◽  
Fine Grained ◽  
Fluvial Processes ◽  
Precise Calculation ◽  
Erosion Pins ◽  
Summer Half ◽  
Lateral Erosion ◽  
Summer Flood

The rate of bank retreat was measured using erosion pins on the alluvial banks of the rivers in the Podhale region (the boundary zone between Central and Outer Carpathians) during the hydrological year 2013/2014. During the winter half-year (November–April), the bank retreat was mainly caused by processes related to the freezing and thawing of the ground (swelling, creep, downfall). During the summer half-year (May–October), fluvial processes and mass movements such as lateral erosion, washing out, and sliding predominated. The share of fluvial processes in the total annual amount of bank retreat (71 cm on average) was 4 times greater than that of the frost phenomena. Erosion on bank surfaces by frost phenomena during the cold half-year was greatest (up to 38 cm) on the upper parts of banks composed of fine-grained alluvium, while fluvial erosion during the summer half-year (exceeding 80 cm) mostly affected the lower parts of the banks, composed of gravel. The precise calculation of the relative role of frost phenomena in the annual balance of bank erosion was precluded at some stations by the loss of erosion pins in the summer flood.

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