But does this conjectural migration from a hypothetical centre of origin still fit the facts?
To determine methodological quality of therapy articles published in Cirugía Española and to study its association with the publication year, the centre of origin and subjects.
However, genomic research shows that T. cacao's greatest diversity is in the upper Amazon region of northwest South America, pointing to this region as its centre of origin.
"It also supports the idea that the Tibetan plateau was, and remains, an important biogeographic region for large mammals and is the centre of origin for many important groups.
According to the dispersalist view, speciation occurs as animals spread out from a centre of origin, crossing preexisting barriers that they would not readily recross and that would cut them off from the original group.
They also suggest that each lineage had contrasting histories; Rivulus sp. is restricted to a relatively small geographic area whereas R. cylindraceus has dispersed considerably and more than once from its centre of origin, probably facilitated by sea level fluctuations.
The centre of origin of the Brassica genus is assumed to be in the Mediterranean region.
These cases are causing a high level of concern because Mexico is the centre of origin and diversity for this crop.
Central Asia is considered to the centre of origin and distribution of HSV following the disappearance of the Tethyan Ocean in the Late Neogene and Early Quaternary Period (Mao and Zhang, 1994).
The cultivation practices inferred from prehistoric sites in Thailand and one in the Thai Malay Peninsula discussed above differ from the lowland paddy field agricultural system that was in place at the centre of origin in the Lower Yangtze when rice spread outwards to other regions ca. 4000 BCE (Fuller and Qin 2009).
He noticed the similarities between the floras of N America and N Asia, the Cape and Australia, and he explored the ideas of "centre of diversity" and "centre of origin".
