The Ocean Biogeographic Information System (OBIS) and its global network of Regional and Thematic OBIS Nodes integrate marine species distribution data from many sources over a wide range of marine themes; from the poles to the equator and from microbes to whales. OBIS is at the same time the data integration component of the Census of Marine life, the marine subnetwork of GBIF, and the biodiversity data management component of the Intergovernmental Oceanographic Commission.
The Hurlberts Index of Biodiversity (also known as ES for expected number of Species) is one of a series of statistics calculated from the OBIS data holdings on a regular basis. The Hurlbert Index is the expected number of species for a given number of specimens (in this case 50), and is a sample-size independent proxy for species richness. Red colours represent high values, blue colours represent low values. Grid cells with less than 50 records were left blank.
Citation: Intergovernmental Oceanographic Commission (IOC) of UNESCO. The Ocean Biogeographic Information System. http://www.iobis.org. (Consulted on dd/mm/yy)
Coordinate System: Geographic
Angular Units: Decimal degrees
Spheroid: WGS 1984
Datum: WGS 1984
Resolution: 1 degree
Contact organisation: The Ocean Biogeographic Information System (OBIS)
UNESCO-IOC Project office for IODE/OBIS
Wandelaarkaai 7, 8400 Oostende
phone: +32 59 34 01 76
The Hurlberts Index of Biodiversity (OBIS, current) is licenced under the OBIS 2008 licence.
Data and maps are freely available; proper credit should be given. In case the maps are used in a publication, please send an electronic copy of the publication to the OBIS project Office.
Read more about this licence.