Does Gene Hunt's 2007 survey of ~250 fossil lineages (stasis and random walk dominate, directional trends rare) narrow the strong punctuated-equilibrium claim the vault records?

evolutionary-biologypunctuated-equilibriumstasisquantitative-paleobiologygene-huntprimary-source-verification

Raised while promoting 10-inbox/raw/2026-07-11-hop-stasis-is-an-ou-process.md into claim-paleots-fits-fossil-stasis-as-a-selected-stochastic-model. The capture cited, as a further lead it "left unfollowed," Gene Hunt's 2007 quantitative result: across roughly 250 fossil lineages, stasis and unbiased random walk dominate the fitted models while directional trends are rare — a finding that would partially narrow the strong Eldredge–Gould punctuated-equilibrium claim. Because the capture read this only secondhand (no primary opened) and it is a specific quantitative claim (~250 lineages), it was not promoted; a number of this kind must rest on its primary before it becomes a note.

Source to read: Gene Hunt, "The relative importance of directional change, random walks, and stasis in the evolution of fossil lineages," PNAS 104 (2007), 18404–18408 (verify exact figures and venue).

Confirm:

1. The dataset size (~250 lineages / trait sequences) and the exact breakdown — what fraction fit stasis, random walk, and directional trend respectively.
2. Whether Hunt frames the result as narrowing or qualifying the strong version of punctuated equilibrium (rapid change is not the dominant within-lineage mode; stasis and drift are).
3. How this squares with the vault's existing PE cluster — claim-punctuated-equilibriums-novel-addition-was-stasis-emphasis, claim-punctuated-equilibrium-derives-from-mayr-peripatric-speciation, claim-mayr-1954-predicted-fossil-record-gaps-from-peripatric-speciation — and whether it warrants its own claim-note qualifying "punctuation."

Why it matters: it is the empirical payoff the seed originally asked for ("did PE survive quantification?") and would add a data-grounded counterweight to the emphasis-on-stasis notes. Distinct from the primary-quote verification in question-verify-biological-punctuated-equilibrium-primaries (Eldredge & Gould 1972 / Mayr 1954), which concerns different documents. Medium priority.

Progress log

• 2026-07-18 (headless promotion of 10-inbox/raw/2026-07-16-does-gene-hunts-2007-survey-of-250-fossil.md): answered qualified-yes, but not by the 2007 paper itself. claim-hunt-2007-directional-evolution-rare-stasis-and-random-walk-split-evenly confirms the dataset (251 sequences, 53 lineages) and figures (5% directional, ~95% split near-evenly between stasis and random walk). claim-hunt-2007-framed-directional-rarity-as-corroborating-punctuated-equilibrium settles point 2: Hunt's own 2007 abstract reads the result as corroborating PE, not narrowing it. The actual narrowing comes from claim-hunt-voje-liow-2025-stasis-common-but-not-dominant — Hunt's own 2025 reassessment with Voje & Liow, finding stasis common (34-38%) but 'not the dominant mode,' offering only partial support for the strong claim. claim-fossil-stasis-studies-test-only-punctuated-equilibriums-tempo-claim-not-its-speciational-claim adds the scope caveat: none of this touches PE's separate, largely-untested speciational (cladogenesis) claim. Point 3 (squaring with the existing PE cluster) is handled inline via wikilinks in all four notes and in the punctuated-equilibrium entity hub's updated References.