identifier: traitmech:000717
label: nutritional fungal mycoparasitism
definition: An ecological phenotype in which a fungus obtains nutrients at the expense
  of another fungus, either from the living host or after killing it.
definition_source: DOI:10.1139/b95-389
trait_category: ECOLOGY
term_kind: CLASS
mapping_status: PROPOSED
parent_traits:
- METPO:1000059
evidence:
- reference: DOI:10.1139/b95-389
  snippet: The term mycoparasitism applies strictly to those relationships in which
    one living fungus acts as a nutrient source for another
  notes: 'Jeffries 1995 review; scientific abstract directly retrieved from https://kar.kent.ac.uk/19621/.
    This strict sense contrasts with broader fungicolous usage in the same abstract.
    Selected main text and actual PDF pages 1 and 3 support detrimental nutrition
    with either a living host or killing before use. The record restricts actor and
    host to fungi, excluding historically grouped oomycetes. The review supplies terminology,
    not an independent experiment. Not every figure or table was inspected. Native
    abstract verifier: UNRESOLVED; the direct institutional excerpt was separately
    matched, not relabeled VERIFIED.'
- reference: DOI:10.1002/rcm.6131
  snippet: In dual-culture the mycelia of T. atroviride which remained in direct contact
    with labeled A. mellea showed an increased δ(13)C value
  notes: 'Pellegrini et al. 2012, PMID:22302490; directly retrieved scientific abstract,
    Results, using DOI and SRC:MED together. Title, DOI and PMID agree. After 29 days
    in contact, the reported carbon isotope value was 66.4 per mille versus -26.6
    per mille with unlabeled host. This supports host-derived carbon assimilation,
    not by itself host killing, a penetration mechanism or exclusion of all alternative
    transfer routes. The journal full text was not retrieved; the restricted institutional
    deposit was not bypassed. The bacterial comparator is not an example of this fungal-actor
    trait. Native abstract verifier: VERIFIED.'
- reference: DOI:10.1016/j.apsoil.2012.12.005
  snippet: Only T. harzianum maintained mycoparasitic activity in the soil microcosm
  notes: 'Pellegrini et al. 2013; scientific abstract directly read at https://iris.unipv.it/handle/11571/604013?mode=complete.
    Native verifier: VERIFIED via AGR:IND500606635, not PubMed. The author-deposited
    Corneo thesis chapter identifies this DOI; its version is not presumed identical
    to the unread journal full text. Its experiment selects three microorganisms:
    the positive soil result concerns a sterile microcosm at 20 C after 29 days, followed
    by three-day culture-out before isotope measurement, not direct field flux or
    all 158 isolates. Dual-culture enrichment accompanies growth inhibition; the host
    viability endpoint comes from a separate broth assay. Washing and host-specific
    PCR address contamination without excluding every route of carbon transfer. Leakage
    versus direct parasitism remains partly interpretive. Shares all six authors with
    2012, not independent-laboratory replication.'
discussions:
- discussion_id: nutritional-fungal-mycoparasitism-scope-and-hierarchy
  prompt: Resolve the broader hierarchy without importing persistent association or
    broad fungicolous usage.
  kind: CURATION_TODO
  status: OPEN
  rationale: Nutrition at host expense is required; mere co-occurrence, fungicolous
    association, antagonism or utilization of already dead material does not establish
    it. Killing, penetration, obligacy and a single mechanism are not universal requirements.
    The unqualified mycoparasitism label is not an exact synonym. Local parasitism
    (traitmech:000043) inherits persistent physical association from symbiosis (traitmech:000040);
    that narrower local umbrella is not automatically applicable to destructive encounters
    included by Jeffries. METPO:1000059 phenotype is retained pending hierarchy review.
    Bacterial mycophagy (traitmech:000696) has a bacterial actor; microbial haustorium
    formation (traitmech:000663) is a structural phenotype, neither necessary nor
    sufficient for this nutrition. Saprotrophy (traitmech:000055) alone does not establish
    attack on a living host; no organism-level disjointness is implied. Pinned and
    current METPO broad lexical matches (0000261, 000262, 1000125, 1000197, 1000198,
    1000227) are deprecated, with no replacement or consider annotation observed.
    Their OMO:0001000 reason does not disprove the biology or license identifier reuse.
    None is an exact active counterpart; historical IDs are not xrefs.
  posed_by: codex
  posed_date: '2026-10-13'
- discussion_id: nutritional-fungal-mycoparasitism-source-and-mechanism-limits
  prompt: Resolve source discrepancies and isolate provenance before assigning canonical
    taxa or a causal mechanism.
  kind: KNOWLEDGE_GAP
  status: OPEN
  rationale: The 2013 abstract reports inhibition of 80 +/- 0.19%; thesis Results
    gives 88 +/- 0.24% and Table 1 gives 80 +/- 0.29%. Fluorogenic-assay sampling
    days differ between Methods and Figure 2; soil-control isotope values differ between
    Results and Table 3. A no-difference statement is paired with P < 0.05, and abstract
    versus Results pathogen exclusions differ. These are unresolved, not silently
    harmonized. Selected thesis Methods, Results, Discussion and actual pages 69,
    73, 75, 86 and 89 were inspected, not all figures, tables or raw data. Ground
    inoculum may include nonviable material; no killed-host control was inspected,
    which is not proof none exists. Table accessions identify BLAST reference strains,
    not experimental isolate deposits. No canonical taxa, exact external mappings,
    protein examples or causal graph are asserted. The measured enzyme activity is
    not a molecular effector identification. Metadata and notice checks were bounded;
    some publisher endpoints failed. Source URLs, hashes, version distinctions and
    native verification results are retained in the sidecar.
  posed_by: codex
  posed_date: '2026-10-13'
curation_history:
- timestamp: '2026-10-13T11:20:51Z'
  curator: codex
  action: MINTED_TRAITMECH_ID
  changes: Added nutritional fungal mycoparasitism with three DOI-backed contiguous
    excerpts and bounded scope, hierarchy and source discussions. Reserved 000717,
    v593 and 1067000-1067099 after ignored/hidden current-file, retained-history,
    independent-copy and open/draft PR checks; numeric false positives adjudicated.
    No exact active METPO counterpart identified in inspected sources. No canonical
    taxa or causal graph inferred; previous records unchanged. Timestamp is observed
    post-audit acceptance, not an estimated write time.
  llm_assisted: true