{
  "id": 4683607,
  "title": "Southern (California) Sea Otter Population Status and Trends at San Nicolas Island, 2023-Winter 2026",
  "url": "https://urgent.news/2026/08/31/southern-california-sea-otter-population-status-and-trends-at-san",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-31T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.28.747881v1?rss=1"
  },
  "original_language": "en",
  "account": "The southern sea otter population on San Nicolas Island, California, has experienced a concerning decline over the past three years. From winter 2023 to winter 2026, the population dwindled by an average of 8.1 percent annually, according to a recent monitoring and research plan initiated by the U.S. Navy and U.S. Fish and Wildlife Service in 2017. As of February 2026, only 106 individuals were counted, a significant drop from the total of 140 sea otters translocated to the island in 1990. Historically, sea otters predominantly inhabited the western end of the island; however, between 2017 and 2022, there was a noticeable shift towards increased seasonal usage of the island's northern and southern sides, as well as a large group of sea otters establishing a temporary residence off the eastern side. By 2023-2026, this east end raft had vanished, and sea otters had returned to their original habitat patterns on the western side of the island. Foraging data, collected from summer 2023 to winter 2026, revealed that the majority of identified prey on successful dives were sea urchins (124), followed by snails (48), bivalves (41), and crabs (23), with one lobster and one octopus also identified among the sea otter's prey items. By combining these data with information from 2020-2022, researchers estimated average energy intake rates of 7.7 kilocalories per minute, with a 95 percent credible interval of 6.6-9.1 kilocalories per minute. These findings provide valuable insights for planning future monitoring and research on sea otters at San Nicolas Island.",
  "summary": "The southern sea otter (Enhydra lutris nereis) population at San Nicolas Island, California, has been monitored annually since the translocation of 140 sea otters to the island was completed in 1990. Monitoring efforts have varied in frequency and method across years. In 2017, in accordance with the National Defense Authorization Act for Fiscal Year 2016, the U.S. Navy and the U.S. Fish and…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}