Isonymy Structure of Buenos Aires City

Abstract

The isonymy structure of Buenos Aires was studied based on its surname frequency. Information on 2,552,359 voters of the 28 Buenos Aires districts was used to estimate Lasker's coefficient of relationship by isonymy (R(i)), surname diversity according to Fisher's alpha, the coefficient of consanguinity resulting from random isonymy (F), and Nei's, Lasker's and the Euclidean isonymy distances. These distances were correlated with geographic distances, which were calculated by assigning an arbitrary point to each district and measuring distances on a map of the city. The R(i) x 10(5) and F x 10(4) averages of the districts located south of Rivadavia Avenue were higher (R(i) = 66.08; F = 3.4) than those situated north of that avenue (R(i) = 46.60; F = 2.4) (p < 0.001). Fisher's alpha showed the opposite behavior (north, alpha = 1,055.5; south, alpha = 757.2). There was a significant correlation (p < 0.001) between geographic distance and Nei's and the Euclidean distances (0.496 and 0.503, respectively), but the correlation was not significant for Lasker's distance (0.051). These results indicate isolation by distance in the city of Buenos Aires and reveal subdivision of the metropolitan population, with greater consanguinity and a lesser variety of surnames in the districts located in the southern section of the city. This structure agrees with the fragmentation and social, cultural, and economic differences observed among the districts of this Latin American metropolis.

Effect of Recent Historical Events on Migration and Isonymic Stratification among the Rama Amerindians from Nicaragua

“…Fisher's α (Fisher 1943) was used to estimate surname diversity and to infer genetic isolation which is analogous to the effective number of alleles in a genetic system. Large Fishers' α values suggest higher migration rates while low levels indicate isolation, increased consanguinity, and genetic drift (Bronberg et al 2009). Lasker's R i (Lasker 1985) provides an estimate of surname relationships within communities.…”

Random inbreeding, isonymy, and population isolates in Argentina

“…The theory proposed by Crow and Mange (1965) together with the accessibility to a large number of names due to technological developments of digital storage and recording have played an important role, in recent years, in the increase in number of isonymyc studies made at continent (Scapoli et al 2007), country (Dipierri et al 2005;Rodriguez Larralde et al 2000, 2003 province or state Barrai 1997, 1998), region (Dipierri et al 2007), and big city (Bronberg et al 2009) levels, which is why information on inbreeding by random isonymy on populations composed of millions of individuals is available.…”

Genealogical data in population medical genetics: field guidelines

“…One use for them in human genetics is in the study of last names as phenotypic markers. Several analytical methods have been described for the use of last names as indicators of ethnicity or breeding structure not only in isolated groups but in large populations as well (Bronberg et al ., 2009). …”