The fossil of a flower, found in Eocene rocks of the Province Black Rio, reveals that the ancestors of daisies, sunflowers and thistles, among other species of the Asteraceae family, would have had its origin in South America. The results of this study were published in Science.
A fossilized flower was found in rocks dating back 47.5 million years near Pichileufú River, 60 km east of the city of San Carlos de Bariloche, Province of Black River. The discovery, made by the director of the Museum of Lake Gutiérrez, Rodolfo Corsolini, gave the kick to an investigation that brought together experts on subjects such as geology, palaeontology, biogeography and phylogeny among other specialties.
The finding of this flower confirms that the origin of the Asteraceae family, which owns the daisies and sunflowers, would have occurred in what is now South America. "The fossil found corresponds to an inflorescence (group of flowers) associated with fossil pollen grains of the Asteraceae family," said the Agency CyTA the study's lead author, Viviana Barreda, Ph.D. in Geological Sciences and a specialist in paleobotany and paleo- palynology (discipline of botany devoted to the study of pollen) the Museum "Bernardino Rivadavia" (MACN).
The research results were published in the September issue of Science. In addition to other colleagues in Argentina, most researchers of CONICET-in also attended Dr. Kare Bremer of the University of Stockholm (Sweden). Fossil
only
The fossil find is the first report of its kind in an inflorescence of Asteraceae, "becoming the first hard evidence that supports previous hypotheses about a South American origin for the family and Eocene age of differentiation same, "Barreda said. He added that "during the Eocene epoch during which the ancestral plant lived -" the supercontinent of Gondwana had already been fragmented, but the land masses were closer now and still there was some kind of floristic exchange, especially long-range transport (by wind or by birds). The climate in the region was warm and wet and develops a lush subtropical type. "
He added that currently the Asteraceae family is widely distributed in all continents except Antarctica.
also the study's lead author stressed that the fossil was difficult to distinguish details of the flower as styles (female reproductive part) and anthers (the male reproductive part) and for that reason it was difficult to tell which was more current Asteraceae. "In this determination played a leading role associated pollen. The pollen, which has a great capacity for preservation-holds valuable taxonomic and grains found in association with the inflorescences are much similar to their living relatives considered basal within the family, with characters coming to a thistle and some current members South American flora, such as the genera of the Guianas and north of the Yungas of Argentina and Bolivia, "he said Barreda.
A fossilized flower was found in rocks dating back 47.5 million years near Pichileufú River, 60 km east of the city of San Carlos de Bariloche, Province of Black River. The discovery, made by the director of the Museum of Lake Gutiérrez, Rodolfo Corsolini, gave the kick to an investigation that brought together experts on subjects such as geology, palaeontology, biogeography and phylogeny among other specialties.
The finding of this flower confirms that the origin of the Asteraceae family, which owns the daisies and sunflowers, would have occurred in what is now South America. "The fossil found corresponds to an inflorescence (group of flowers) associated with fossil pollen grains of the Asteraceae family," said the Agency CyTA the study's lead author, Viviana Barreda, Ph.D. in Geological Sciences and a specialist in paleobotany and paleo- palynology (discipline of botany devoted to the study of pollen) the Museum "Bernardino Rivadavia" (MACN).
The research results were published in the September issue of Science. In addition to other colleagues in Argentina, most researchers of CONICET-in also attended Dr. Kare Bremer of the University of Stockholm (Sweden). Fossil
only
The fossil find is the first report of its kind in an inflorescence of Asteraceae, "becoming the first hard evidence that supports previous hypotheses about a South American origin for the family and Eocene age of differentiation same, "Barreda said. He added that "during the Eocene epoch during which the ancestral plant lived -" the supercontinent of Gondwana had already been fragmented, but the land masses were closer now and still there was some kind of floristic exchange, especially long-range transport (by wind or by birds). The climate in the region was warm and wet and develops a lush subtropical type. "
He added that currently the Asteraceae family is widely distributed in all continents except Antarctica.
also the study's lead author stressed that the fossil was difficult to distinguish details of the flower as styles (female reproductive part) and anthers (the male reproductive part) and for that reason it was difficult to tell which was more current Asteraceae. "In this determination played a leading role associated pollen. The pollen, which has a great capacity for preservation-holds valuable taxonomic and grains found in association with the inflorescences are much similar to their living relatives considered basal within the family, with characters coming to a thistle and some current members South American flora, such as the genera of the Guianas and north of the Yungas of Argentina and Bolivia, "he said Barreda.
Source: argenpress.info / Image: Argentina, Science - Fossil analyzed by Viviana Barreda
0 comments:
Post a Comment