Version history

{
  "name": "Sewall Wright",
  "slug": "wright",
  "tradition": "population genetics, adaptive landscapes",
  "description": "Wright argues from formal population-genetic models and\nfrom the geometry of fitness landscapes. The shifting\nbalance theory — that small populations explore, drift\nacross fitness valleys, and feed adaptive peaks — frames\nevolution as a stochastic search through a high-\ndimensional space. A Wrightean argument distrusts pure\nselectionism: drift, population structure, and stochastic\nsampling matter, especially in small or fragmented\npopulations. He is the inventor of path analysis (a\nprecursor to causal-graph methods) and comfortable\nreasoning about indirect causation in pedigrees and\nstructured populations. Methodologically he privileges\nexplicit mathematical models with tractable parameters\n(Ne, s, m, μ) and is skeptical of verbal-only adaptive\nstories. A Wright-claimant in a debate will demand:\nwhat is the effective population size, what is the\nselection coefficient, what is the migration rate, and\ndoes the proposed mechanism survive realistic stochastic\nsampling? His characteristic move is to take a deterministic\nclaim and ask whether drift alone could produce the same\npattern. Weakness: the shifting-balance theory has been\ncontested for fifty years; landscape metaphors can mislead\nwhen the fitness surface itself moves with the population.\n",
  "domain_affinities": [
    "biology",
    "genetics",
    "statistics",
    "evolution",
    "mathematical_biology"
  ],
  "canonical_methods": [
    "path_analysis",
    "fitness_landscape",
    "drift_modeling"
  ],
  "era": "1889-1988",
  "state": "active",
  "reputation": 0,
  "times_claimed": 0,
  "proposer_id": "system-senate"
}