INVESTIGADORES
GONZALEZ-JOSE rolando
congresos y reuniones científicas
Título:
Scenarios for the early settlement of the Americas and the importance of recurrent gene flow with Asia.
Autor/es:
DE AZEVEDO SOLEDAD,; NOCERA, A; PASCHETTA, CAROLINA; CASTILLO, LUCIA; GONZÁLEZ, MARINA; GONZÁLEZ JOSÉ, ROLANDO
Reunión:
Congreso; 81th Annual Meeting of the American Association of Physical Anthropologists; 2012
Resumen:
Different
scenarios attempting to describe the initial phases of the human dispersal from
Asia into the New World have been proposed
during the last three decades. However, some aspects concerning the population
affinities among early and modern Asians and Native Americans remain
controversial. Specifically, contradictory views based mainly on partial
evidence such as skull morphology or molecular genetics have led to hypotheses
such as the ?Two Waves/Components? and ?Single Wave? or ?Out of Beringia?
model, respectively. Alternatively, an integrative scenario considering both
morphological and molecular variation has been proposed and named as the
?Recurrent Gene-Flow? hypothesis. This scenario considers a single origin for
all the Native Americans, and local, within-continent evolution plus the persistence of contact among circum-Arctic
groups. Here we analyze 2D geometric
morphometric data to evaluate the associations between observed craniometric
distance matrix and different geographic design matrices reflecting distinct
scenarios for the peopling of the New World
using basic and partial Mantel tests. Additionally, we calculated the rate of
morphological differentiation between Early and Late American samples under the
different settlement scenarios and compared our findings to the predicted morphological
differentiation under neutral conditions. Also, we incorporated in our analyses
some variants of the classical Single-Wave and Two-Waves models as well as the
Recurrent Gene-Flow model. Our results suggest a better explanatory performance
of the ?Recurrent Gene Flow? model, and provide additional
insights concerning affinities among Asian and Native American circum-Arctic
groups.