Closely related and distantly related synthetic denitrifying communities used to test how phylogenetic diversity affects denitrification and stability.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
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| Shewanella sp. — ontology label: Shewanella | NCBITaxon:22 · TaxonMech · TraitMech | N/A | |
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| Paracoccus denitrificans | NCBITaxon:266 · 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.
High-Phylogenetic-Diversity Function and Stability
In the 200-generation experiment, the high-phylogenetic-diversity DR design showed greater productivity, denitrification rate and temporal stability than the closely related Shewanella-only CR design. Preserve the positive community comparison without treating the two designs as one coexisting Shewanella-Paracoccus pair or asserting a measured compound-resolved niche mechanism.
Biological Processes:
- denitrification (GO:0019333 · PathwayMech)
Evidence
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PMID:37207729 - SUPPORT (IN_VITRO)"high phylogenetic diversity followed by experimental evolution promoted the function and stability of synthetic denitrifying communities "
Paracoccus-Dominated DR Denitrification
Paracoccus denitrificans dominated the DR community from generation 50 onward, where productivity and denitrification rates were significantly higher than in the CR communities. Preserve this positive abundance/function observation. Dominance is not a demonstrated reciprocal competition assay, nor does this comparison isolate Paracoccus abundance as the causal driver of higher function.
Biological Processes:
- denitrification (GO:0019333 · PathwayMech)
Evidence
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PMID:37207729 - SUPPORT (IN_VITRO)"higher with Paracocus denitrificans as the dominant species (since the 50th generation) in the DR community than those in the CR community"
DR Overyielding and Asynchronous Stability
DR communities had significantly higher temporal stability, with overyielding and asynchronous species fluctuations, and more complementarity than CR communities during evolution. Preserve the reported stability result and statistical ecological interpretation. Aggregate complementarity/asynchrony does not identify exchanged resources or demonstrate a species-resolved causal chain; higher stability is not an upstream cause of its own decomposition.
Biological Processes:
- denitrification (GO:0019333 · PathwayMech)
Evidence
-
PMID:37207729 - SUPPORT (IN_VITRO)"higher stability through overyielding and asynchrony of species fluctuations "
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PMID:37207729 - SUPPORT (IN_VITRO)"showed more complementarity than the CR group during the experimental evolution"
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN Which biological mechanisms link phylogenetic diversity to denitrification and stability?
The removed CR/DR assembly and 200-generation nodes described workflow, retained in engineering_design. Endpoint-to-dominance and endpoint-to-stability-decomposition arrows did not establish those causal directions. All three positive biological findings remain. Exact-system main text was unavailable; the open companion all-Shewanella experiment is not interchangeable with this CR/DR design. Missing biological directions remain #1706 pending a scoped Edison report; no new reversed arrow. Non-graph medium equivalence, taxon-design evidence and greenhouse-gas wording remain #1709.
Attaches to: ecological_interactions#High-Phylogenetic-Diversity Function and Stability, ecological_interactions#Paracoccus-Dominated DR Denitrification, ecological_interactions#DR Overyielding and Asynchronous Stability
2 evidence item(s)
high phylogenetic diversity followed by experimental evolution promoted the function and stability of synthetic denitrifying communities
Supports the experimentally observed function/stability advantage, not a particular interspecies transfer mechanism.
higher stability through overyielding and asynchrony of species fluctuations
Supports the reported ecological pattern and interpretation, without identifying compound-resolved niche partitioning or an experimentally isolated mediator.
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| defined synthetic community design | Closely related communities used Shewanella strains; distantly related communities used constituents from different genera. | N/A |
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Growth Media
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