Slide 13 of 21
Notes:
DIFFERENT PATTERNSBY TAXON
3/4 SHOW MID-LATITUDE PEAK, NOT STEADY RISE.
IF WE WERE TO CONTINUE SOUTH THOUGH, RICHNESS OF ALL GROUPS WOULD SHOW A CONTINUING RISE TO EVEN HIGHER LEVELS.
BUT these mid-lat. peaks are real and suggest something else is going on besides simple responses to latitude per se
