Miguel Delgado
I am an archaeologist at the National University of La Plata, Argentina. My research is about the early peopling of South America as viewed from bioarchaeological indicators within a chronological and paleoenvironmental framework. The theoretical bases of my research are human biogeography and evolutionary geography. In addition, I am interested in stable isotope analysis, 3D geometric morphometrics in modern and past hominin populations and the correlation between genetic and phenotypic traits among living human populations.
Supervisors: Gustavo Barrientos
Address: Paseo del Bosque s/n. (B1900FWA), La Plata, República Argentina.
Supervisors: Gustavo Barrientos
Address: Paseo del Bosque s/n. (B1900FWA), La Plata, República Argentina.
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this variation for inferring genetic ancestry proportions in a sample of admixed Latin Americans.
Materials and Methods: We characterized a sample from Colombia (N = 477) for 34 dental
traits and obtained estimates of individual Native American, European, and African ancestry
using genome-wide SNP data. We tested for correlation between dental traits, genetic ancestry,
age, and sex. We carried out a biodistance analysis between the Colombian sample and reference
continental population samples using the mean measure of divergence statistic calculated
from dental trait frequencies. We evaluated the inference of genetic ancestry from dental traits
using a regression approach (with 10-fold cross-validation) as well as by testing the correlation
between estimates of ancestry obtained from genetic and dental data.
Results: Latin Americans show intermediate dental trait frequencies when compared to Native
Americans, Europeans, and Africans. Significant correlations were observed for several dental
traits, genetic ancestry, age, and sex. The biodistance analysis displayed a closer relationship of
Colombians to Europeans than to Native Americans and Africans. Mean ancestry estimates
obtained from the dental data are similar to the genetic estimates (Native American: 32%
vs. 28%, European: 59% vs. 63%, and African: 9% vs. 9%, respectively). However, dental features
Palabras clave: Poblamiento inicial, arqueología, bioantropología, Colombia
America (Colombia) corresponding to the Pleistocene/Holocene transition (ca. 12,000-8000 14C years
BP). The first step in the study was to assemble from both published and unpublished sources an
exhaustive database of 14C dates (n = 85), recording data regarding the environmental setting and spatial
coordinates of each site, stratigraphic provenance of the dated samples, material used for dating, and 14C
dating method. After the application of different filtering procedures based on outlier detection techniques,
the database was subsequently reduced (n = 77). Using uncalibrated and calibrated dates, some
spatial and temporal trends in data distribution were investigated in order to illustrate both the strengths
and weaknesses of the available database. It is concluded that three main features that characterize the
14C dataset from Northwest South America, namely the very high percentage of 14C measurements made
on charcoal, the almost total disregard of bone as a target sample for dating, and the extremely low
percentage of AMS dates, partially affect both its reliability and comparability. It is suggested that, in
order to use 14C dates as data to make reliable inferences about the timing, pattern, process and tempo of
early exploration and colonization of the study area, work at two different levels would be profitably
carried out. In the short term, it would be advisable to develop an extensive and exhaustive program
aimed at redating, with AMS and new sample selection criteria, the more significant archaeological
assemblages attributable to the Pleistocene/Holocene transition. In the medium to long term, it would be
necessary to implement new research projects specifically aimed at obtaining original information about
early human settlement in different geographical areas of the Colombian territory.
y algunos elementos de la autoetnografía de Elizabeth Tabares. También se hace énfasis en el enfoque de la antropología biomédica de las poblaciones del Pacífico colombiano desarrollado en la Universidad del Cauca.
this variation for inferring genetic ancestry proportions in a sample of admixed Latin Americans.
Materials and Methods: We characterized a sample from Colombia (N = 477) for 34 dental
traits and obtained estimates of individual Native American, European, and African ancestry
using genome-wide SNP data. We tested for correlation between dental traits, genetic ancestry,
age, and sex. We carried out a biodistance analysis between the Colombian sample and reference
continental population samples using the mean measure of divergence statistic calculated
from dental trait frequencies. We evaluated the inference of genetic ancestry from dental traits
using a regression approach (with 10-fold cross-validation) as well as by testing the correlation
between estimates of ancestry obtained from genetic and dental data.
Results: Latin Americans show intermediate dental trait frequencies when compared to Native
Americans, Europeans, and Africans. Significant correlations were observed for several dental
traits, genetic ancestry, age, and sex. The biodistance analysis displayed a closer relationship of
Colombians to Europeans than to Native Americans and Africans. Mean ancestry estimates
obtained from the dental data are similar to the genetic estimates (Native American: 32%
vs. 28%, European: 59% vs. 63%, and African: 9% vs. 9%, respectively). However, dental features
Palabras clave: Poblamiento inicial, arqueología, bioantropología, Colombia
America (Colombia) corresponding to the Pleistocene/Holocene transition (ca. 12,000-8000 14C years
BP). The first step in the study was to assemble from both published and unpublished sources an
exhaustive database of 14C dates (n = 85), recording data regarding the environmental setting and spatial
coordinates of each site, stratigraphic provenance of the dated samples, material used for dating, and 14C
dating method. After the application of different filtering procedures based on outlier detection techniques,
the database was subsequently reduced (n = 77). Using uncalibrated and calibrated dates, some
spatial and temporal trends in data distribution were investigated in order to illustrate both the strengths
and weaknesses of the available database. It is concluded that three main features that characterize the
14C dataset from Northwest South America, namely the very high percentage of 14C measurements made
on charcoal, the almost total disregard of bone as a target sample for dating, and the extremely low
percentage of AMS dates, partially affect both its reliability and comparability. It is suggested that, in
order to use 14C dates as data to make reliable inferences about the timing, pattern, process and tempo of
early exploration and colonization of the study area, work at two different levels would be profitably
carried out. In the short term, it would be advisable to develop an extensive and exhaustive program
aimed at redating, with AMS and new sample selection criteria, the more significant archaeological
assemblages attributable to the Pleistocene/Holocene transition. In the medium to long term, it would be
necessary to implement new research projects specifically aimed at obtaining original information about
early human settlement in different geographical areas of the Colombian territory.
y algunos elementos de la autoetnografía de Elizabeth Tabares. También se hace énfasis en el enfoque de la antropología biomédica de las poblaciones del Pacífico colombiano desarrollado en la Universidad del Cauca.
America (Colombia) corresponding to the Pleistocene/Holocene transition (ca. 12,000e8000 14C years
BP). The first step in the study was to assemble from both published and unpublished sources an
exhaustive database of 14C dates (n ¼ 85), recording data regarding the environmental setting and spatial
coordinates of each site, stratigraphic provenance of the dated samples, material used for dating, and 14C
dating method. After the application of different filtering procedures based on outlier detection techniques,
the database was subsequently reduced (n ¼ 77). Using uncalibrated and calibrated dates, some
spatial and temporal trends in data distribution were investigated in order to illustrate both the strengths
and weaknesses of the available database. It is concluded that three main features that characterize the
14C dataset from Northwest South America, namely the very high percentage of 14C measurements made
on charcoal, the almost total disregard of bone as a target sample for dating, and the extremely low
percentage of AMS dates, partially affect both its reliability and comparability. It is suggested that, in
order to use 14C dates as data to make reliable inferences about the timing, pattern, process and tempo of
early exploration and colonization of the study area, work at two different levels would be profitably
carried out. In the short term, it would be advisable to develop an extensive and exhaustive program
aimed at redating, with AMS and new sample selection criteria, the more significant archaeological
assemblages attributable to the Pleistocene/Holocene transition. In the medium to long term, it would be
necessary to implement new research projects specifically aimed at obtaining original information about
early human settlement in different geographical areas of the Colombian territory.