Cenozoic Planktonic Marine Diatom Diversity and Correlation to Climate Change
Figure 2
Equability (increasing dominance) in relative frequencies of diatom species in NSB occurrence data over the Cenozoic.
a) Dimensionless shape metric D(80), defined as fraction of total diversity reached in ranked frequency occurrence data at 80% of total area. For data with all frequencies equal (flat black line) D(80) = 0.8; D(80) decreases with increasingly unequal frequencies. b) D(80) vs time in Cenozoic NSB diatom data. Age scale: [43].