{
  "type": "Collection",
  "stac_version": "1.0.0",
  "stac_extensions": ["https://stac-extensions.github.io/table/v1.2.0/schema.json", "https://stac-extensions.github.io/scientific/v1.0.0/schema.json"],
  "id": "cdfw_dungeness-crab",
  "title": "CDFW Dungeness Crab Megalopae",
  "description": "Dungeness crab (Metacarcinus magister) megalopae and larval decapods picked from archived CalCOFI oblique-tow plankton samples, examined for the California Department of Fish and Wildlife. Two efforts: a 2008-2014 time series of 310 sorted samples (A. Klemmedson, 2015) yielding 24 M. magister megalopae from 14 samples, and 216 archived samples from the 1949-2009 sorting log that were examined and found free of M. magister (1984-2009, E. Jones, as of 2012-02-15). Only examined samples are published — the log's remaining unsorted rows are a fact of the archive's inventory, not a sample of this dataset. Spring cruises, CalBOBL oblique tows, lines < 80 / stations < 90. Counts are occurrence in the examined aliquot, not standardized density. Sorting was performed at the SIO Pelagic Invertebrate Collection, where the removed megalopae are archived in vials.\n",
  "keywords": ["EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > ZOOPLANKTON", "EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS > DECAPODS"],
  "license": "CC-BY-4.0",
  "providers": [
    {
      "name": "California Department of Fish and Wildlife",
      "roles": ["producer", "licensor"],
      "url": "https://wildlife.ca.gov"
    },
    {
      "name": "CalCOFI",
      "roles": ["processor", "host"],
      "url": "https://calcofi.io"
    }
  ],
  "extent": {
    "spatial": {
      "bbox": [
        [-132.25, 33.46, -120.675, 51.05]
      ]
    },
    "temporal": {
      "interval": [
        [
          "1984-01-01T00:00:00Z",
          "2014-12-31T23:59:59Z"
        ]
      ]
    }
  },
  "sci:citation": "Rogers-Bennett, L.; Jones, E.; Klemmedson, A. (2026). CDFW Dungeness Crab Megalopae from archived CalCOFI plankton samples (1949-2014). California Department of Fish and Wildlife, published through CalCOFI / Scripps Institution of Oceanography.\n",
  "table:tables": [
    {
      "name": "sample",
      "description": "One row per physical sampling event at its native grain (site, tow, net, cast, bottle, underway, transect, region pool). An adjacency list: `parent_sample_key` points at the containing event and `root_sample_key` at the top of the chain, so counting distinct events at any level is a single `GROUP BY`."
    },
    {
      "name": "obs",
      "description": "The occurrence-headline long table: one scalar measurement per row, environmental (`realm = 'env'`) and biological (`realm = 'bio'`) together. Biological taxon is the global `taxon_key`; sub-occurrence detail (length/stage bins, behavior) lives in `obs_attribute`, and event-level effort in `sample_measurement`."
    },
    {
      "name": "obs_attribute",
      "description": "Sub-occurrence attribution: the breakdown *within* an `obs` headline row. Covers numeric frequency distributions (length bins, stage numbers) and categorical breakdowns (seabird behavior). Counts here sum to the headline where the source is internally consistent."
    },
    {
      "name": "sample_measurement",
      "description": "Event-level (effort) measurements: quantities that describe the sampling event itself rather than anything observed in it — net volume filtered, standard haul factor, proportion sorted, bottle cast conditions. Kept apart from `obs` so effort is never mistaken for an observation."
    },
    {
      "name": "taxon",
      "description": "Taxonomic hierarchy for species via WoRMS and ITIS authorities (built from spp.duckdb via recursive CTEs)"
    },
    {
      "name": "dataset_taxon",
      "description": "Crosswalk from each dataset's own taxon vocabulary to the global `taxon_key`. `obs` resolves its taxon by joining this on (`dataset_key`, `ds_taxa_code`), so a dataset can keep its local codes without leaking them into the shared model."
    }
  ],
  "summaries": {
    "calcofi:category": ["Zooplankton"],
    "calcofi:variables": ["abundance", "count", "Fish Eggs & Larvae"]
  },
  "links": [
    {
      "rel": "root",
      "href": "https://storage.googleapis.com/calcofi-db/stac-staging/catalog.json",
      "type": "application/json"
    },
    {
      "rel": "parent",
      "href": "https://storage.googleapis.com/calcofi-db/stac-staging/catalog.json",
      "type": "application/json"
    },
    {
      "rel": "self",
      "href": "https://storage.googleapis.com/calcofi-db/stac-staging/collections/cdfw_dungeness-crab/collection.json",
      "type": "application/json"
    },
    {
      "rel": "about",
      "href": "https://calcofi.io/datasets/cdfw_dungeness-crab/",
      "type": "text/html",
      "title": "Dataset page"
    },
    {
      "rel": "license",
      "href": "https://creativecommons.org/licenses/by/4.0/",
      "type": "text/html",
      "title": "Creative Commons Attribution 4.0 International"
    }
  ]
}