Table 2

Estimated best-fit model parameters for the neocete, mysticete, and odontocete data sets. δ18O, oxygen isotope records used as proxy for climate change (8); diatom, diatom species diversity (Neptune database) (7); rock, total number of fossiliferous marine formations as downloaded from the Paleobiology Database (4); st. dur., geologic stage duration; the latter was included as a nonoptional predictor in all models to account for the potentially biasing effects of unequal Cenozoic stage durations.

Neoceti
sampled-in-bin
Neoceti
ranged-through
Mysticeti
sampled-in-bin
Odontoceti
sampled-in-bin
EstimateSEEstimateSEEstimateSEEstimateSE
Intercept6.6941.4656.6491.1112.2140.1795.5661.179
St. dur.–0.0470.189–0.0680.1670.0960.0230.0490.166
Diatom0.0290.0050.0280.0030.015<0.0010.0200.003
δ18O–2.8810.577–2.2530.422–1.0770.081–2.1470.351
Rock–0.0130.006