Washington: In a new study, scientists have found the evidence that the transition between fish and amphibians occurred in the humid, wooded floodplains.
According to Gregory J. Retallack from the University of Oregon, his discoveries at numerous sites in Maryland, New York and Pennsylvania suggests, “such a plucky hypothetical ancestor of ours probably could not have survived the overwhelming odds of perishing in a trek to another shrinking pond.”
This scenario comes from the late Devonian, about 390 million years ago to roughly 360 million years ago. Paleontologist Alfred Romer, who died in 1973 after serving on the faculties at the University of Chicago and Harvard University, saw this time as a period of struggle and escape, and important in fish-tetrapod transition, to ensure survival.
In the new study, Retallack argues for a very different explanation. He examined numerous buried soils in rocks yielding footprints and bones of early transitional fossils between fish and amphibians of Devonian and Carboniferous geological age. What he found raises a major challenge to Romer’s theory.
“These transitional fossils were not associated with drying ponds or deserts, but consistently were found with humid woodland soils,” Retallack said.
“Remains of drying ponds and desert soils also are known and are littered with fossil fish, but none of our distant ancestors. Judging from where their fossils were found, transitional forms between fish and amphibians lived in wooded floodplains. Our distant ancestors were not so much foolhardy, as opportunistic, taking advantage of floodplains and lakes choked with roots and logs for the first time in geological history,” he said.
He said that the limbs proved handy for negotiating woody obstacles, and flexible necks allowed for feeding in shallow water. By this new woodland hypothesis, the limbs and necks, which distinguish salamanders from fish, did not arise from reckless adventure in deserts, but rather were nurtured by a newly evolved habitat of humid, wooded floodplains.
The findings, Retallack said, dampen both the desert hypothesis of Romer and a newer inter-tidal theory put forth by Grzegorz Niedbwiedzki and colleagues at the University of Warsaw.
In 2010, they published their discovery of eight-foot-long, 395-million-year-old tetrapods in ancient lagoonal mud in southeastern Poland, where Retallack also has been studying fossil soils with Polish colleague Marek Narkeiwicz.
“Ancient soils and sediments at sites for transitional fossils around the world are critical for understanding when and under what conditions fish first walked,” Retallack said.
“The Darwin fish of chrome adorning many car trunks represents a particular time and place in the long evolutionary history of life on earth,” he added.
The study has been published in the Journal of Geology.