The constraints of nature may be capable of altering even deeply hardwired attributes of creatures. Signifying this aspect, experts from the University of Oregon have disclosed a unique theory which suggests how certain fishes got transformed into amphibians.
An extensive trial conducted at various sites indicated that the transitional fossils of fishes were not related to dried ponds or desert locations. Rather, they were found near humid woodland soils which implied that our remote ancestors evolved in an ambience which was moist and warm.
“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,” remarked Gregory J. Retallack, professor of geological sciences.
The scientists believed that limbs were essential to overcome woody barriers while a flexible neck helped the fishes stay in shallow water. However, according to this new hypothesis, the limbs and neck that appear distinctive in salamanders and fish may not have been formed from hardcore adventures in deserts. These body parts would have been nurtured steadily in humid air covering wooded floodplains.
However, detailed scrutiny of transitional fossils across the globe is vital to get an insight into the atmosphere and settings when fishes first showcased their tryst with walking. Similar to this scenario is the Darwin fish of chrome clothed in car trunks which implicated a specific period and location in the lengthy evolutionary history of life on the planet.
The research is published in the Journal of Geology.