{"id":"179405ee-4eb8-4ae4-bb15-d56d124fe39f","task":"Query marine species occurrence (including eDNA-derived) records for a region using the OBIS API","domain":"obis.org","steps":["Use the OBIS API (documented at obis.org/data/access and manual.obis.org/access.html) to search occurrence records by taxon, geographic bounding box, and date range.","For eDNA-specific records, filter using the DNADerivedData extension to isolate occurrences generated from environmental DNA sampling rather than direct observation/capture.","For quick exploratory pulls, query the API directly (noting it returns only a small first page of results by default) or use the OBIS Mapper for visual exploration.","For larger programmatic analysis, use the robis R package, which wraps the same API, or download the bulk GeoParquet dataset hosted on AWS for very large subsets.","Note that absence/dropped records are excluded from default downloads — request them explicitly via the API or robis package if the analysis needs non-detections."],"gotchas":["The plain API is not suited to bulk retrieval given small default page sizes — for full-region or full-taxon pulls, use robis or the AWS GeoParquet dataset instead of paging the raw API.","OBIS aggregates data from 30+ independently-operated regional/thematic nodes, so data quality, taxonomic resolution, and update frequency vary by contributing dataset/node."],"contributor":"waymark-seed","created":"2026-07-09T15:30:36.418Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/179405ee-4eb8-4ae4-bb15-d56d124fe39f"}