https://doi.org/10.6073/pasta/4a92a0044bcd1523a4f994ece874a57d https://calcofi.io/datasets/cce-lter_euphausiids/ Euphausiids (Krill) Rasmus Swalethorp California Current Ecosystem Long Term Ecological Research Linsey Sala California Current Ecosystem Long Term Ecological Research 2026-09-06 eng Species- and life-stage-resolved euphausiid (krill) abundance from CalCOFI / CCE-LTER net tows (BTEDB export), 1951-present, one row per tow x species x life stage. Supersedes the prior single-Abundance- column ingest, which had no taxonomic scope (Q02, now resolved) — units remain provisional pending provider confirmation (Q01). EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > ZOOPLANKTON EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS > EUPHAUSIIDS (KRILL) GCMD Science Keywords Euphausiids (Krill) euphausiid_abundance numberPerMeterSquared Custom terms stated by the provider (https://portal.edirepository.org/nis/metadataviewer?packageid=knb-lter-cce.313.1) https://calcofi.io/datasets/cce-lter_euphausiids/ 28.0–46.6°N, 133.5–117.3°W -133.467 -117.283 46.6 28 1951 2019 Euphausiids (Krill) species Euphausia brevis 110683 species Euphausia diomedeae 221056 species Euphausia distinguenda 237852 species Euphausia eximia 237853 species Euphausia gibboides 110684 species Euphausia hemigibba 110686 species Euphausia lamelligera 237856 species Euphausia mutica 110688 species Euphausia pacifica Pacific krill 237851 species Euphausia recurva 221047 species Euphausia tenera 221052 species Hansarsia atlantica 1649783 species Hansarsia difficilis 1649784 species Hansarsia gracilis 1649787 species Hansarsia microps 1649790 species Hansarsia tenella 1649791 species Nematobrachion boopis 110691 species Nematobrachion flexipes 110692 species Nyctiphanes simplex 237864 species Stylocheiron abbreviatum 110699 species Stylocheiron affine 110700 species Stylocheiron carinatum 110701 species Stylocheiron elongatum 110702 species Stylocheiron longicorne 110703 species Stylocheiron maximum 110704 species Stylocheiron suhmii 110706 species Tessarabrachion oculatum 237870 species Thysanoessa gregaria 110707 species Thysanoessa longipes 237873 species Thysanoessa spinifera 237874 species Thysanopoda astylata 237875 species Thysanopoda cornuta 110714 species Thysanopoda egregia 110716 species Thysanopoda monacantha 110718 species Thysanopoda obtusifrons 110719 species Thysanopoda orientalis 221063 species Thysanopoda pectinata 110720 CalCOFI data@calcofi.io Rasmus Swalethorp California Current Ecosystem Long Term Ecological Research principalInvestigator Linsey Sala California Current Ecosystem Long Term Ecological Research principalInvestigator Data originate from the Brinton and Townsend Euphausiid Database of the Pelagic Invertebrate Collection, Scripps Institution of Oceanography. Supported in recent years by NSF grants to M.D. Ohman and the CCE-LTER site. sample 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. sample_key Sample Key Globally unique event key, namespaced dataset_key:sample_type:id so the same integer id in two datasets — or at two event levels in one dataset — never collides. VARCHAR Globally unique event key, namespaced dataset_key:sample_type:id so the same integer id in two datasets — or at two event levels in one dataset — never collides. sample_type Sample Type Event grain: site, tow, net, cast, bottle, underway, transect or region_pool. VARCHAR Event grain: site, tow, net, cast, bottle, underway, transect or region_pool. parent_sample_key Parent Sample Key The containing event (net → tow → site; bottle → cast). NULL at the top of the chain. Flat adjacency list: attributes are not inherited. VARCHAR The containing event (net → tow → site; bottle → cast). NULL at the top of the chain. Flat adjacency list: attributes are not inherited. root_sample_key Root Sample Key Top of this event's containment chain; equals sample_key for single-level datasets. Use count(DISTINCT root_sample_key) to count stations/casts irrespective of grain. VARCHAR Top of this event's containment chain; equals sample_key for single-level datasets. Use count(DISTINCT root_sample_key) to count stations/casts irrespective of grain. dataset_key Dataset Key Provenance stamp: provider_dataset. VARCHAR Provenance stamp: provider_dataset. grid_key Grid Key CalCOFI station grid cell. NULL where the dataset has no station assignment (region-pooled phytoplankton). VARCHAR CalCOFI station grid cell. NULL where the dataset has no station assignment (region-pooled phytoplankton). site_key Site Key CalCOFI station natural key as the source records it (line/station, e.g. 090.0 060.0). Present on 13 of the 18 source event tables, so it is carried on the event dimension rather than lost to consolidation; grid_key is the derived grid cell, this is the source's own station id. VARCHAR CalCOFI station natural key as the source records it (line/station, e.g. 090.0 060.0). Present on 13 of the 18 source event tables, so it is carried on the event dimension rather than lost to consolidation; grid_key is the derived grid cell, this is the source's own station id. cruise_key Cruise Key CalCOFI cruise natural key YYYY-MM-NODC. VARCHAR CalCOFI cruise natural key YYYY-MM-NODC. order_occ Order of Occupation Order in which the station was occupied on the cruise. Source spelling varies (order_occ, ord_occ) and CTD stores it as text; normalised to an integer here. INTEGER dimensionless integer latitude Latitude Event latitude (WGS84). DOUBLE degree real longitude Longitude Event longitude (WGS84). DOUBLE degree real datetime Datetime Event start time (UTC). TIMESTAMP YYYY-MM-DDThh:mm:ss depth_min_m Depth Min Shallowest depth sampled by this event. DOUBLE meter real depth_max_m Depth Max Deepest depth sampled by this event. DOUBLE meter real tow_type Tow Type Net gear code where the dataset records one (C1/CB/CV/PV oblique or vertical, MT manta); NULL for gears and datasets without one. Needed to compute gear-appropriate CPUE. VARCHAR Net gear code where the dataset records one (C1/CB/CV/PV oblique or vertical, MT manta); NULL for gears and datasets without one. Needed to compute gear-appropriate CPUE. data_stage Data Stage The source's own processing state for this event: final (post-cruise calibrations applied) or preliminary (not for publication — the source warns that oxygen, nitrate and chlorophyll may change significantly once calibrated). Populated by calcofi_ctd-cast; NULL where the dataset draws no such distinction, which is not a claim that the data are final. VARCHAR The source's own processing state for this event: final (post-cruise calibrations applied) or preliminary (not for publication — the source warns that oxygen, nitrate and chlorophyll may change significantly once calibrated). Populated by calcofi_ctd-cast; NULL where the dataset draws no such distinction, which is not a claim that the data are final. geom Geometry Point geometry minted from longitude/latitude (OGC:CRS84). GEOMETRY('EPSG:4326') Point geometry minted from longitude/latitude (OGC:CRS84). source_uuid Source Uuid Source Uuid UUID Source Uuid seafloor_depth_m seafloor_depth_m DOUBLE dimensionless real station_uuid station_uuid UUID station_uuid station_uuid_method station_uuid_method VARCHAR station_uuid_method obs 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. data_0.parquet 710442 841d387165b801fc91807e26b9d4c11aee6527b25ea33b7a356e75f3baa7c87d Apache Parquet https://storage.googleapis.com/calcofi-db/ducklake/tables/obs/dataset_key=cce-lter_euphausiids/eb06f688035ebc51fe036938/data_0.parquet obs_id Observation ID Surrogate key, renumbered globally when the release concatenates the per-dataset shards. BIGINT dimensionless integer realm Realm env for physical/chemical measurements, bio for organism observations. VARCHAR env for physical/chemical measurements, bio for organism observations. dataset_key Dataset Key Provenance stamp: provider_dataset. VARCHAR Provenance stamp: provider_dataset. sample_key Sample Key The sampling event this observation came from; joins sample. VARCHAR The sampling event this observation came from; joins sample. grid_key Grid Key CalCOFI station grid cell, denormalized from sample so rollups need no join. NULL for region-pooled data. VARCHAR CalCOFI station grid cell, denormalized from sample so rollups need no join. NULL for region-pooled data. cruise_key Cruise Key Cruise, denormalized from sample so rollups need no join. VARCHAR Cruise, denormalized from sample so rollups need no join. latitude Latitude Observation latitude (WGS84). DOUBLE degree real longitude Longitude Observation longitude (WGS84). DOUBLE degree real datetime Datetime Observation time (UTC). NULL for region-pooled data with no event time. TIMESTAMP YYYY-MM-DDThh:mm:ss depth_min_m Depth Min Shallowest depth this observation represents. DOUBLE meter real depth_max_m Depth Max Deepest depth this observation represents; equal to depth_min_m for point measurements (bottle, CTD scan). DOUBLE meter real taxon_key Taxon Key Global taxon key, worms:<AphiaID> or itis:<TSN> for birds. NULL for env rows. Joins taxon. VARCHAR Global taxon key, worms:<AphiaID> or itis:<TSN> for birds. NULL for env rows. Joins taxon. life_stage Life Stage Life stage where the source resolves one (larva, adult, juvenile, egg, phyllosoma). VARCHAR Life stage where the source resolves one (larva, adult, juvenile, egg, phyllosoma). measurement_type Measurement Type Measured quantity; joins the measurement_type vocabulary. VARCHAR Measured quantity; joins the measurement_type vocabulary. measurement_value Measurement Value The measured value, in the units measurement_type declares. DOUBLE dimensionless real measurement_qual Measurement Qualifier Source quality flag, verbatim. VARCHAR Source quality flag, verbatim. measurement_prec Measurement Precision Source-reported precision where available. DOUBLE dimensionless real hex_id Hex ID H3 cell at resolution 10, stored as UBIGINT. Aggregate coarser at query time with h3_cell_to_parent(hex_id, res) — there is no per-resolution column ladder. UBIGINT dimensionless whole taxon Taxonomic hierarchy for species via WoRMS and ITIS authorities (built from spp.duckdb via recursive CTEs) taxon_key Taxon Key Global taxon key: lowercase authority prefix plus id, worms:127023 or itis:176754. VARCHAR Global taxon key: lowercase authority prefix plus id, worms:127023 or itis:176754. worms_id WoRMS ID WoRMS AphiaID. INTEGER dimensionless integer itis_id ITIS ID ITIS Taxonomic Serial Number. INTEGER dimensionless integer gbif_id GBIF ID GBIF backbone taxon key. INTEGER dimensionless integer ncbi_id NCBI ID NCBI Taxonomy id. INTEGER dimensionless integer inat_id iNaturalist ID iNaturalist taxon id. INTEGER dimensionless integer scientific_name Scientific Name Accepted scientific name. VARCHAR Accepted scientific name. common_name Common Name Common name where one is recorded. VARCHAR Common name where one is recorded. rank Rank Taxonomic rank. VARCHAR Taxonomic rank. rank_order Rank Order Ordinal for sorting ranks from kingdom down. INTEGER dimensionless integer taxonomic_status Taxonomic Status Status as fetched from the keying authority (accepted, unaccepted, superseded combination, ...). Read it with status_checked — before v2026.08.05 this column was the literal string "accepted" on every row, stamped rather than fetched. VARCHAR Status as fetched from the keying authority (accepted, unaccepted, superseded combination, ...). Read it with status_checked — before v2026.08.05 this column was the literal string "accepted" on every row, stamped rather than fetched. status_checked Status Checked Date taxonomic_status was last confirmed against the authority. A status with no check date is not a fact. VARCHAR Date taxonomic_status was last confirmed against the authority. A status with no check date is not a fact. parent_taxon_key Parent Taxon Key Lineage parent; walk this to expand a taxon to its descendants. VARCHAR Lineage parent; walk this to expand a taxon to its descendants. kingdom Kingdom Kingdom. VARCHAR Kingdom. phylum Phylum Phylum. VARCHAR Phylum. class Class Class. VARCHAR Class. order_taxon Order Order (named order_taxon because order is a SQL keyword). VARCHAR Order (named order_taxon because order is a SQL keyword). family Family Family. VARCHAR Family. notes Notes Append-only provenance log, one datestamped line per entry: how each id was resolved and any re-key onto an authority-accepted id (e.g. itis:174553 Puffinus griseus -> itis:1255050 Ardenna grisea). The dataset's own original code and name stay in dataset_taxon. VARCHAR Append-only provenance log, one datestamped line per entry: how each id was resolved and any re-key onto an authority-accepted id (e.g. itis:174553 Puffinus griseus -> itis:1255050 Ardenna grisea). The dataset's own original code and name stay in dataset_taxon. dataset_taxon 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. ds_taxon_key Dataset Taxon Key Key of this crosswalk row, <dataset-or-known-list>:<local code>. VARCHAR Key of this crosswalk row, <dataset-or-known-list>:<local code>. dataset_key Dataset Key The dataset whose vocabulary this row belongs to. VARCHAR The dataset whose vocabulary this row belongs to. taxon_key Taxon Key The global taxon it resolves to; joins taxon. VARCHAR The global taxon it resolves to; joins taxon. ds_scientific_name Dataset Scientific Name Scientific name as the source dataset spells it. VARCHAR Scientific name as the source dataset spells it. ds_common_name Dataset Common Name Common name as the source dataset spells it. VARCHAR Common name as the source dataset spells it. ds_taxa_code Dataset Taxa Code The dataset's own code, as stored on its measurement rows. VARCHAR The dataset's own code, as stored on its measurement rows. ds_source_json Ds Source Json Ds Source Json VARCHAR Ds Source Json measurement_type measurement_type Measurement Type Measurement Type VARCHAR Measurement Type description Description Description VARCHAR Description units Units Units VARCHAR Units valid_min Valid Min Valid Min DOUBLE dimensionless real valid_max Valid Max Valid Max DOUBLE dimensionless real valid_depth_min_m Valid Depth Min M Valid Depth Min M DOUBLE dimensionless real valid_depth_max_m Valid Depth Max M Valid Depth Max M DOUBLE dimensionless real derivation Derivation Derivation VARCHAR Derivation is_canonical Is Canonical Is Canonical BOOLEAN Is Canonical _source_column Source Column Source Column VARCHAR Source Column _source_table Source Table Source Table VARCHAR Source Table _source_datasets Source Datasets Source Datasets VARCHAR Source Datasets _qual_column Qual Column Qual Column VARCHAR Qual Column _prec_column Prec Column Prec Column VARCHAR Prec Column grain Grain Grain VARCHAR Grain denominator Denominator Denominator VARCHAR Denominator category Category Category VARCHAR Category variable Variable Variable VARCHAR Variable nerc_p01 Nerc P01 Nerc P01 VARCHAR Nerc P01 units_nerc_p06 Units Nerc P06 Units Nerc P06 VARCHAR Units Nerc P06 provider Provider Provider VARCHAR Provider dataset Dataset Dataset VARCHAR Dataset Data originate from the Brinton and Townsend Euphausiid Database of the Pelagic Invertebrate Collection, Scripps Institution of Oceanography. Supported in recent years by NSF grants to M.D. Ohman and the CCE-LTER site. Ohman, M.D. 2022. California Current Ecosystem Euphausiid data, Brinton and Townsend Euphausiid Database (BTEDB) ver 1. Environmental Data Initiative. https://doi.org/10.6073/pasta/4a92a0044bcd1523a4f994ece874a57d cce-lter_euphausiids https://calcofi.io/datasets/cce-lter_euphausiids/ v2026.09.06 CalCOFI (2026). CalCOFI Integrated Database, release v2026.09.06 [Data set]. Scripps Institution of Oceanography, NOAA Fisheries, and California Department of Fish and Wildlife. https://calcofi.io/db-schema/?v=v2026.09.06 2026-09-04