7 dic 2012
Indiana University paleobotanist David L. Dilcher and colleagues in Europe have presented a scenario in which flowering plants, or angiosperms, evolved and colonized various types of aquatic environments over about 45 million years in the early to middle Cretaceous Period.
The work is based on extensive fossil data from Europe and provides a comprehensive picture of how angiosperms evolved and connect their evolution with changes in the physical and biological environments.
Dilcher, who has studied the rise and spread of flowering plants for decades, said the scenario is consistent with findings from the fossil record in North America, including his own work showing that angiosperms occupied a variety of aquatic and near-aquatic environments.
"This attention to the total picture of plant groups and the paleo-environment begins to form a pattern. We're able to turn the pages of time with a little more precision," Dilcher said.
Darwin wrote to Joseph Dalton Hooker in 1879, about 20 years after the publication of "On the Origin of Species," that the rapid development of higher plants in recent geological times was "an abominable mystery." The issue has long preoccupied paleobotanists, with competing theories seeking to explain how angiosperms supplanted ferns and gymnosperms in many regions of the globe.
Dilcher and his colleagues show that angiosperms successfully invaded certain environments, gradually spreading to others.
They said that angiosperms migrated to new environments in three phases: freshwater lake-related wetlands between 130 million and 125 million years ago; understory floodplains between 125 million and 100 million years ago.
And natural levees, back swamps and coastal swamps between 100 million and 84 million years ago
While paleobotanists once focused on collecting fossil flora and trying to make connections with present-day varieties, Dilcher and his colleagues have produced new insights into the evolutionary biology of flowering plants through close analysis of morphology and anatomy.
Dilcher added that co-evolution with insects gave angiosperms an evolutionary advantage. Insects played a vital role in cross-pollinating plants and accelerating the spread of genetic material. Plants evolved the means to "advertise themselves" with fragrances and bright colors while producing pollen and nectar that provided food for insects.
The researchers published their work online this week in the Proceedings of the National Academy of Sciences.
