Making Marine Life Count: A New Baseline for Policy
Figure 4
Four maps used for Convention on Biological Diversity Ecologically and Biologically Significant Areas Criterion 6, Biological diversity (Annex of reference 11).
(a) total records in OBIS, corrected for differences in surface area between squares on different latitude; (b) the total number of species, corrected for differences in surface area between squares on different latitude; (c) Shannon Index; (d) Hurlbert's Index, es(50).