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Niche partitioning in a periphyton metacommunity peaks at intermediate species richness in midsized rivers.
Ecology
January 2025
Department of Ecology, University of Innsbruck, Innsbruck, Austria.
The trait-based partitioning of species plays a critical role in biodiversity-ecosystem function relationships. This niche partitioning drives and depends on community structure, yet this link remains elusive in the context of a metacommunity, where local community assembly is dictated by regional dispersal alongside local environmental conditions. Hence, elucidating the coupling of niche partitioning and community structure needs spatially explicit studies.
View Article and Find Full Text PDFMicrobial Carbon Use Efficiency and Growth Rates in Soil: Global Patterns and Drivers.
Glob Chang Biol
January 2025
Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, University of Goettingen, Göttingen, Germany.
Carbon use efficiency (CUE) of microbial communities in soil quantifies the proportion of organic carbon (C) taken up by microorganisms that is allocated to growing microbial biomass as well as used for reparation of cell components. This C amount in microbial biomass is subsequently involved in microbial turnover, partly leading to microbial necromass formation, which can be further stabilized in soil. To unravel the underlying regulatory factors and spatial patterns of CUE on a large scale and across biomes (forests, grasslands, croplands), we evaluated 670 individual CUE data obtained by three commonly used approaches: (i) tracing of a substrate C by C (or C) incorporation into microbial biomass and respired CO (hereafter C-substrate), (ii) incorporation of O from water into DNA (O-water), and (iii) stoichiometric modelling based on the activities of enzymes responsible for C and nitrogen (N) cycles.
View Article and Find Full Text PDFLow functional change despite high taxonomic turnover characterizes the microbiome across a 2000-km salinity gradient.
Sci Adv
January 2025
Phycology Research Group, Department of Biology, Ghent University, Ghent, Belgium.
The green seaweed relies on associated bacteria for morphogenesis and is an important model to study algal-bacterial interactions. -associated bacteria exhibit high turnover across environmental gradients, leading to the hypothesis that bacteria contribute to the acclimation potential of the host. However, the functional variation of these bacteria in relation to environmental changes remains unclear.
View Article and Find Full Text PDFMechanisms of recalcitrant fucoidan breakdown in marine Planctomycetota.
Nat Commun
December 2024
AZTI, Marine Research, Basque Research and Technology Alliance (BRTA), Sukarrieta, Spain.
Marine brown algae produce the highly recalcitrant polysaccharide fucoidan, contributing to long-term oceanic carbon storage and climate regulation. Fucoidan is degraded by specialized heterotrophic bacteria, which promote ecosystem function and global carbon turnover using largely uncharacterized mechanisms. Here, we isolate and study two Planctomycetota strains from the microbiome associated with the alga Fucus spiralis, which grow efficiently on chemically diverse fucoidans.
View Article and Find Full Text PDFHost dispersal relaxes selective pressures in rafting microbiomes and triggers successional changes.
Nat Commun
December 2024
Department of Marine Science, University of Otago, Dunedin, New Zealand.
What little we know about how microbiomes change over the course of host dispersal has been gleaned from simulations or snapshot sampling of microbiomes of hosts undertaking regular, cyclical migrations. These studies suggest that major changes in both microbiome richness and turnover occur in response to long-distance movements, but we do not yet know how rare or sporadic dispersal events for non-migratory organisms might affect the microbiomes of their hosts. Here we directly examine the microbiomes of rafting seaweed, leveraging host genomic analyses, amplicon sequencing, and oceanographic modelling to study the impacts of ecological dispersal of hosts on their microbiomes.
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