The Ocean Biodiversity Information System (OBIS) is the global, open-access data platform dedicated specifically to marine biodiversity occurrence records — where marine species have been observed, collected, or recorded, and when. It is governed as part of the Intergovernmental Oceanographic Commission of UNESCO (IOC-UNESCO), and it is closely linked to, but organizationally and scientifically distinct from, the better-known Global Biodiversity Information Facility (GBIF), which aggregates biodiversity data across all terrestrial, freshwater, and marine life. For research administrators and data managers supporting oceanographic, fisheries, and marine ecology projects, knowing which of the two platforms — or both — a funder, data management plan, or repository requirement actually points to matters for compliance and data-sharing decisions.
What OBIS Is and What It Covers
OBIS aggregates species-occurrence records for marine life: taxonomically identified observations of where and when a species was found, contributed by research institutions, monitoring programs, museums, and citizen-science initiatives worldwide. Like its terrestrial counterpart GBIF, OBIS does not run its own surveys or collect specimens itself; it is an aggregation and publishing infrastructure that ingests, standardizes, quality-checks, and republishes datasets submitted by a distributed network of contributing institutions (“OBIS nodes”), then makes the combined record openly searchable and downloadable.
Its stated aim is to provide comprehensive, freely accessible data on the diversity, distribution, and abundance of marine life in support of ocean science, conservation, and sustainable-use decisions by IOC-UNESCO’s member states. That mandate makes OBIS a primary reference point for marine biogeography, species-distribution modelling, and time-series analyses of how ocean biodiversity is changing.
Governance: IOC-UNESCO and the IODE Programme
OBIS traces its origin to the decade-long Census of Marine Life project, under the name Ocean Biogeographic Information System, launched around 2000. In June 2009, the Member States of the Intergovernmental Oceanographic Commission of UNESCO (IOC-UNESCO) formally adopted OBIS as a component of the Commission’s International Oceanographic Data and Information Exchange (IODE) programme, giving it an intergovernmental, treaty-level home rather than leaving it as a standalone project. That is the key governance fact research administrators should know: OBIS is not a private consortium or a single national agency’s tool — it operates under a UN specialized-agency programme with a global membership, which is one reason funders and national ocean-science agencies treat it as the default marine biodiversity data infrastructure to reference in data management plans.
History: From the Census of Marine Life to a UNESCO Programme
The Census of Marine Life (2000–2010) was a decade-long international research program aimed at assessing the diversity, distribution, and abundance of marine life across the world’s oceans. OBIS was built as that program’s data legacy: a platform to hold and make openly available the occurrence data the census generated, designed from the outset to keep accepting new contributions after the census itself ended. Its 2009 transfer into IOC-UNESCO’s IODE programme secured it long-term institutional continuity beyond the life of the original project — a governance pattern research-infrastructure funders increasingly look for when assessing whether a repository named in a data management plan is a durable choice.
OBIS and GBIF: Related but Distinct Networks
OBIS and GBIF are frequently confused because they overlap in purpose (open biodiversity-occurrence data), share the same underlying data standard, and actively collaborate — but they are separate networks with separate governance, separate node/registration structures, and different scope:
- Scope. GBIF aggregates occurrence data for all life — plants, fungi, terrestrial and freshwater animals, and marine species alike. OBIS is scoped specifically to the marine environment: ocean, coastal, and estuarine biodiversity.
- Governance. GBIF is an intergovernmental network coordinated by a Secretariat and funded by participating governments and organizations, structured around regional Participant Nodes. OBIS is governed as a programme within IOC-UNESCO’s IODE, with its own node network of contributing institutions and Regional/Thematic OBIS Nodes.
- Registration and data flow. OBIS is itself registered with GBIF as a data-publishing network, meaning a substantial share of the marine occurrence records aggregated in OBIS also become discoverable through GBIF’s own search interface. The reverse is not automatic: a marine-relevant dataset published only to GBIF by a node outside the OBIS network is not necessarily mirrored into OBIS. Because the two platforms maintain separate registration and quality-control pipelines, a researcher or repository choosing where to publish marine data should not assume depositing in one automatically and completely satisfies discoverability through the other.
- Collaboration. GBIF and IOC-UNESCO/OBIS have a formal collaboration agreement and have jointly developed shared tooling and an interoperable data standard (see below), and the two organizations have periodically published joint strategy and action-plan commitments specifically for marine biodiversity data. In practice this means the two communities coordinate rather than compete, but the underlying platforms remain administratively separate.
For a practical rule of thumb: if a data management plan, funder mandate, or repository requirement says “marine biodiversity data” or “ocean biodiversity occurrence data” specifically, check whether it names OBIS, GBIF, or both — and if only one is named, confirm with the funder or journal whether depositing there alone is treated as sufficient, since the two indexes are not fully interchangeable. See CASRAI’s GBIF dictionary entry for the equivalent detail on the broader platform.
Data Standards: Darwin Core and Shared Tooling
OBIS and GBIF both publish data using Darwin Core, the Biodiversity Information Standards (TDWG) vocabulary for documenting species occurrences, taxonomic identifications, and associated event and location data. Datasets are commonly packaged as Darwin Core Archives (DwC-A) — a zipped bundle of Darwin Core–mapped data files plus a machine-readable descriptor — and both platforms have supported and jointly refined the Integrated Publishing Toolkit (IPT), the common software used by contributing institutions to build and validate these archives before submission. This shared standard is precisely what makes cross-discovery between OBIS and GBIF possible at all: without a common vocabulary, aggregating contributions from thousands of independent institutions into one searchable index would not be practical. Dataset-level documentation submitted alongside an archive typically also uses Ecological Metadata Language (EML), the same descriptive-metadata standard common across biodiversity and ecological data infrastructures. See CASRAI’s guide on choosing a metadata schema for a dataset for how Darwin Core and EML fit alongside other schema options.
How Researchers and Institutions Use OBIS
Marine researchers, oceanographic institutions, and national data centers use OBIS in two directions:
- Publishing. An institution generating marine species-occurrence data — from survey cruises, monitoring stations, tagging studies, eDNA sampling, or museum specimen digitization — can register as (or contribute through) an OBIS node, format the dataset in Darwin Core, and publish it through the OBIS network, making it openly citable and discoverable.
- Reuse. Researchers building species-distribution models, tracking range shifts under climate change, conducting marine spatial planning, or supporting conservation assessments query OBIS’s combined dataset rather than trying to individually locate and reconcile occurrence records scattered across dozens of separate institutional databases.
Because OBIS aggregates rather than hosts primary raw data files for every contribution, a data management plan naming OBIS as a data destination should still separately specify where any non-occurrence data products (raw instrument data, imagery, sequence data, and so on) will be deposited — typically a general-purpose or domain repository — alongside OBIS as the occurrence-record index. CASRAI’s guide on choosing an open data repository covers that broader repository-selection decision.
Role in Marine Research-Data Compliance and Ocean Science Policy
OBIS sits inside a wider push toward open, interoperable ocean data. It is referenced within the UN Decade of Ocean Science for Sustainable Development (“Ocean Decade,” 2021–2030) as core infrastructure for the comprehensive biodiversity and biogeographic knowledge that evidence-based ocean management and conservation depend on. For research administrators, the practical implications are similar to those of any FAIR-aligned domain repository: funders and journals increasingly expect marine biodiversity occurrence data to be deposited somewhere globally discoverable and standards-compliant rather than left in an unshared institutional database, and OBIS (alongside GBIF, where scope overlaps) is the default answer for “somewhere” in the marine domain. See CASRAI’s overview of the FAIR Data Principles for the broader compliance framework this sits within, and the Data Management Plan (DMP) entry for how a repository choice like OBIS is documented in funder-facing planning.
Frequently Asked Questions
What is the difference between OBIS and GBIF?
GBIF aggregates biodiversity-occurrence data across all life, on land and in water. OBIS is scoped specifically to marine and ocean biodiversity, is governed separately as a programme of IOC-UNESCO’s IODE, and maintains its own network of contributing nodes. The two share the Darwin Core data standard and collaborate closely, including a formal collaboration agreement and joint marine-data strategy work, but they are administratively distinct platforms, not two names for the same system.
Who governs OBIS?
OBIS operates under the International Oceanographic Data and Information Exchange (IODE) programme of the Intergovernmental Oceanographic Commission of UNESCO (IOC-UNESCO), following its formal adoption by IOC-UNESCO Member States in June 2009. It originated as a Census of Marine Life project beginning around 2000.
Is data in OBIS free and open to use?
OBIS is built on the same open-access aggregation model as GBIF: records are freely searchable and downloadable, with individual datasets typically carrying their own attribution and licensing terms set by the contributing institution, most commonly a Creative Commons license. Always check the specific license attached to a dataset of interest rather than assuming uniform terms across the whole platform.
Does publishing data to OBIS also make it appear in GBIF?
Often, yes — OBIS is registered with GBIF as a data-publishing network, so a substantial share of OBIS-aggregated marine records are also discoverable through GBIF. This is not a strict guarantee for every dataset, however, and the reverse is not automatic: marine data published to GBIF outside the OBIS network is not necessarily mirrored into OBIS. If cross-discoverability through both platforms specifically matters for a funder requirement, confirm the dataset’s registration status on both rather than assuming it.
How does a research institution contribute data to OBIS?
Contributions are made through the OBIS node network: an institution formats its marine occurrence data in Darwin Core (commonly packaged as a Darwin Core Archive built with the Integrated Publishing Toolkit), then publishes through an existing regional or thematic OBIS node, or, where none covers its region or discipline, works with OBIS’s coordinating secretariat on registration.
Related CASRAI Resources
- GBIF (Global Biodiversity Information Facility) — the all-taxa counterpart platform OBIS is most often compared to.
- Darwin Core — the shared data standard behind both OBIS and GBIF.
- Ecological Metadata Language (EML) — the companion dataset-documentation standard.
- NEON: Continental-Scale Ecological Data for Researchers — a comparable domain-specific ecological data infrastructure, for terrestrial ecology.
- How to Choose a Metadata Schema for a Dataset
- How to Choose an Open Data Repository
- FAIR Data Principles
- Data Management Plan (DMP)
