{
  "annotation_id": "81d4f0dd-b12e-4c6f-8a31-c150333d1712",
  "date_created": "2026-03-02T18:01:35.093000Z",
  "date_modified": "2026-03-02T18:01:35.093000Z",
  "file_hash": "95254b25002a9b7d206165f52a5a29f05d0c44883de8970f5197e3cabdc603a3",
  "private": false,
  "record": {
    "abstract": "Time evolution of number of species (genera, families, and others),\npopulation of them, and size distribution of present ones and life times are\nstudied in terms of a new model, where population of each genetic taxon\nincreases by a (random) rate and decreases by (random) division\n(fragmentation). Each of log-normal, exponential and power law distributions in\nvarious empirical data about mentioned events are considered for gradual,\nintermittent and abrupt evolution cases. Results come out in good agreement\nwith several theoretical literatures and with available empirical data. Sum of\nexponential functions with independent random amplitude and exponent are shown\nto be useful to express many aspects of the present competition, and they are\nshown here to involve power law with power -1.",
    "arxiv_id": "q-bio/0702040",
    "authors": [
      "Caglar Tuncay"
    ],
    "categories": [
      "q-bio.PE"
    ],
    "title": "A physical model for competition between biological speciation and   extinction",
    "url": "https://arxiv.org/abs/q-bio/0702040"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e5bffadd-f823-4989-b0e9-f94cfec02504",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}