... Gould and Vrba 1982, or preadaptation) has also EVOLUTIONARY TRENDS | 105been shown to be important in the origin of defense and pollination systems, and that each system has influenced the evolution ... beetles, of Bursera-ceae and leaf-eating chrysomelid beetles, and of floral resins in Euphorbiaceaeor Clusiaceae and pollinating bees (Chapter 5). Additionally, biochemical and coevolutionary studies ... families,such as sesqui- and diterpenoids in Fabaceae, sesqui- and triterpenoids inDipterocarpaceae, mono-, sesqui-, and diterpenoids in Pinaceae, and mono-,sesqui-, and triterpenoids in Burseraceae...