{
  "annotation_id": "debebb2a-5d22-4015-a19b-092fe3d9bab1",
  "date_created": "2026-03-02T18:01:32.238000Z",
  "date_modified": "2026-03-02T18:01:32.238000Z",
  "file_hash": "05dc000490e3e0f3e84b960eacbf416d54712508e0e3b9d31dc74ebe93055017",
  "private": false,
  "record": {
    "abstract": "A microscopic model is developed, within the frame of the theory of\nquantitative traits, to study both numerically and analytically the combined\neffect of competition and assortativity on the sympatric speciation process,\ni.e. speciation in the absence of geographical barriers. Two components of\nfitness are considered: a static one that describes adaptation to environmental\nfactors not related to the population itself, and a dynamic one that accounts\nfor interactions between organisms, e.g. competition. The effects of finiteness\nof population size on survival of coexisting species are also accounted for.\nThe simulations show that both in the case of flat and ripid static fitness\nlandscapes, competition and assortativity do exert a synergistic effect on\nspeciation. We also show that competition acts as a stabilizing force against\nextinction due to random sampling in a finite population. Finally, evidence is\nshown that speciation can be seen as a phase transition.",
    "arxiv_id": "q-bio/0402038",
    "authors": [
      "Franco Bagnoli",
      "Carlo Guardiani"
    ],
    "categories": [
      "q-bio.PE"
    ],
    "doi": "10.1016/j.physa.2004.08.068",
    "journal_ref": "Physica A 347, 534-574 (2005)",
    "title": "A model of sympatric speciation through assortative mating",
    "url": "https://arxiv.org/abs/q-bio/0402038"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d064c48b-072c-4ecd-b687-c7cb23cb2d1a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}