A panel of synthetic denitrifying communities assembled from 12 Shewanella denitrifiers with richness spanning one to twelve species and evolved for 180 days to measure how biodiversity-ecosystem functioning relationships changed for productivity and nitrate-reduction activity.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Shewanella denitrifiers — ontology label: Shewanella | NCBITaxon:22 · TaxonMech · TraitMech | N/A | |
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Ecological Interactions
The graph shows only explicitly linked interaction participants. Community members without an asserted participant link are omitted; membership alone does not imply an interaction.
Early Richness-Function Correlation
Higher initially assigned richness was associated with greater productivity at days 3, 30 and 60, but with greater nitrate-reduction activity only at days 3 and 30. The source operationally measured nitrate disappearance, not complete denitrification to gaseous products. These panel-level associations are time-dependent; initial richness is not proof of invariant realized membership throughout propagation.
Metabolites: nitrate (CHEBI:17632 · MediaIngredientMech · CMMMech)
Evidence
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PMID:37154752 - SUPPORT (IN_VITRO)"A significant positive correlation was observed between community richness and functions, represented by productivity (biomass) and denitrification rate "
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PMID:37154752 - SUPPORT (IN_VITRO)"no association between denitrification rate and richness was detected (P > 0.05) at the 60th, 90th, 120th, 150th, and 180th days"
Larger Functional Increases at Lower Initial Richness
Communities assigned lower initial richness showed larger increases in productivity and nitrate-reduction activity across the transfer series, while the initially positive richness-function association became undetectable later. This does not establish identical final performance or identify beneficial mutations as the cause; composition changed during propagation and the proposed molecular mechanisms remain unresolved.
Metabolites: nitrate (CHEBI:17632 · MediaIngredientMech · CMMMech)
Evidence
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PMID:37154752 - SUPPORT (IN_VITRO)"microbial community functions with lower richness exhibited greater increases than those with higher richness "
Complementarity-Dominated BEF Partitioning
Additive partitioning of biomass-based yields attributed more of the net biodiversity effect to complementarity than selection. Complementarity increased over time, with larger increases at lower initial richness. This is a statistical decomposition, not direct measurement of substrate exchange, niche differentiation or a molecular mediator of nitrate reduction.
Metabolites: nitrate (CHEBI:17632 · MediaIngredientMech · CMMMech)
Evidence
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PMID:37154752 - SUPPORT (IN_VITRO)"Biodiversity effect analysis revealed positive BEF relationships largely attributable to complementary effects "
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PMID:37154752 - SUPPORT (IN_VITRO)"we partitioned the net biodiversity effect on productivity into complementarity and selection using an additive partitioning equation"
Mixture-Associated Relative Yield Differences
Mixture and corresponding monoculture yields differed among the constituent Shewanella taxa, and the authors used relative yields to infer community interaction effects. Those aggregate comparisons do not identify a specific pairwise interaction, exchanged metabolite, or causal genetic change.
Evidence
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PMID:37154752 - SUPPORT (IN_VITRO)"inferred species interactions by comparing the contribution of each species in their mix-cultures and their corresponding monocultures "
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN Which ecological and molecular changes explain the time-dependent richness-function relationship?
The primary study measures nitrate disappearance, productivity, changing composition and yield-derived biodiversity effects. It does not resolve the proposed molecular mechanisms of larger gains at low initial richness. The two workflow nodes and their remaining arrow are removed; the four biological observations or analytical results remain without invented mechanistic directions.
Attaches to: ecological_interactions#Early Richness-Function Correlation, ecological_interactions#Larger Functional Increases at Lower Initial Richness, ecological_interactions#Complementarity-Dominated BEF Partitioning, ecological_interactions#Mixture-Associated Relative Yield Differences
1 evidence item(s)
further studies should focus on the understanding of molecular mechanisms of asymmetrical complementary effects on the dynamic BEF relationships
The authors explicitly leave the molecular explanation for future work.
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| Serial nitrate-richness gradient | 1, 2, 4, 8, and 12 species across 180 days | N/A |
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Growth Media
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