Non-avian dinosaurs and flu viruses would appear to share few, if any, characteristics. After all, one group consisted of large animals that went extinct millions of years ago, while the other includes pathogenic particles that are unfortunately still very much with us.
The evolutionary histories of dinosaurs and viruses have more in common than one might expect. And a new method for studying the animals is already being recruited in the fight against influenza and additional viruses that can infect humans and other species. The groundbreaking technique is described in the journal Nature Ecology & Evolution.
The breakthrough involves projecting shifting rates of evolutionary change onto the surface of a sphere, instead of on a flat plane. This allows biogeographical data to be analyzed within an Earth-resembling model that captures speed, direction, and distance moved over short to long periods of time.
"As long as a group of organisms can be placed in a phylogenetic tree, which describes how species are related to each other, or a single species of interest can be placed in the context of its close relationships within a phylogenetic tree, and has geographical data — longitudes and latitudes of where the organisms have occurred on the Earth — the method we develop can reconstruct where the organisms’ ancestors existed on the globe," co-author Andrew Meade of the University of Reading told Seeker.
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On the dinosaur side of the research, the technique has already revealed new insights concerning the origin and dispersal of dinosaurs.
Meade, lead author Ciara O'Donovan, and senior author Chris Venditti plugged extensive information on dinosaurs and their fossil record into their model. The data came from the Paleobiology Database, an online resource curated by numerous scientists around the world.
The information shows that dinosaurs first evolved in what is now South America at close to the beginning of the Mesozoic Era, which lasted in its entirety from about 252–66 million years ago.
"Prior to the dinosaurs’ origination there was an extreme extinction event," O'Donovan told Seeker. "This happened 252 million years ago, at the Permian-Triassic boundary and is the largest extinction event to have occurred in Earth’s history."
"This decimated the majority of life on Earth and therefore may well have provided the dinosaurs with a blank canvas to colonize," she added. "This fairly ‘empty Earth’ would have been totally open and up for grabs, and the dinosaurs were able to spread across the globe quickly, taking every ecological opportunity in their path."
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Pangea — the single, giant landmass that later broke up to form the continents — was additionally whole when the dinosaurs originated about 231 million years ago. This meant that there were few, if any, geographical barriers preventing the dinosaurs' movement.
O'Donovan and her team suspect that the dinosaurs must have had some beneficial biological predisposition, enabling them to take advantage of the "blank canvas" they found themselves on. This aided their moving, dispersing, and colonizing new habitats. The remains of dinosaurs have remarkably been found on every continent, from what are now the polar regions to nearly every place in between.
The researchers tracked the movements through evolutionary time of the four major groups of dinosaurs — Ornithischians, Sauropods, Theropods, and birds — as well as certain individual species, like Tyrannosaurus rex.