Co-evolution with dinosaurs?
|In 1986 Bob Bakker suggested that angiosperms
and dinosaurs may have co-evolved, with dinosaur feeding habits influencing the
evolution of angiosperms. A change in herbivore communities occurred just
before the evolution of angiosperms, and he argued that the new dinosaur
groups were instrumental in stimulating the explosive radiation of the angiosperms.|
The fossil remains from around 160 million years ago (Late Jurassic) tell us that around 95% of the herbivore biomass was made up of high-browsing stegosaurs and sauropods with cranial and dental adaptations for feeding on conifers. This browsing pattern put pressure on the mature trees but still permitted the gymnosperm seedlings to flourish.
This model has been rejected by many scientists because there is no proven direct relationship between the change in dinosaur communities and the evolution of angiosperms.