Nowshahr, Northern Lran
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Anthropologieet Préhisloiru, 100, 1989,103-1ll Surnames and gene flow in Shahrestan Nowshahr, Northern lran Haideh MEHRAI and Eric SUNDERLAND Abstract Demographic data were collected to estimate the degree of biological kinship within and between the subdivisions of Shahrestan Nowshahr, using Lasker's (1977) isonymy model. The results indicate some degreeof surname localization within the dehestans and the contiguous regions. The applicability of the model to Iranian data was also assessed. Résumé Des données démographiques ont été récoltées dans le Shahrestan Nowshahr pour déceler le degré de prenté biologique, intra- et inter-subdiuisions, en utilisant le modèIe d'isonymie de Lasker (1977). Les résultats indiquent un certain degré de localisation des noms à I'intérieur des dehestanset dans les régions contiguës. Les auteurs s'interrogent sur l'application du modèle aus données iraniennes. INrNooUcTIoN lated for long periods of time due to its inaccessibil- ity and lack of good communications. Many of the Surnames became mandatory in Iran in 1925, spatially separated localities were inhabited by small when the Civil Registration Office was established. extended families, with marriages confined to the in- The CRO conducted a nationwide system of registra- dividual villages. However, many of these families in- tion whereby each inhabitant was issued an Identity termarried with contiguousfamilies and consequently Card. In conjunctionwith this, the adoption of a sur- formed a larger network of kinship. Behnam (1968) name was also required. definesone type of rural family structure a^sthe "ex- Before 1925 family names were limited to a mi- tended patricentral family", where related families nority. Sometraced their origin in the Prophet's line, are supervised by the extended parental family, and while others were a.scribedby kings in accordance inter-familial marriages are maintained. with their services. The Taifeh (a kinship group) re- Ancestral names have persisted in these areas, ferred to numerous tribes that originally inhabited but their frequency varies according to the size of the the rural regions of the country. They comprised a village, geographic location and the economic struc- network of relatives which originated a.s an a^ssem- ture. In some instancesdouble-surnames appear, in- blage of families linked by geographic proximity, or dicating the union of two families. In the present loyalty to a common chief (Behnam, lg70). Due to study, the samples from each village are too small isolation these families eventually intermarried, and for analysis, therefore names have been analysed at the kinship group was enlarged. 1'he Hezerfamil re- the dehestanlevel, which necessarilyreduces the sig- ferred to various hereditary families who numbered nificance of the extent of localization of names. Ad- one thousand. When surnames were adopted, the ditionally, it would be very difficult to observe dis- choice of name was based on various factors. Some tinct clines in surname flow between the dehestans, chosethe name of their village, while others followed becauseof the irregular distribution of the villages their trade, e.g. Khatat (scribe). The suffix "zadeh" within each dehestan. In general,surnames are not (born to) was added to some forenames,€.g. Hossein- very mobile due to the low mobility of the population "y" zadeh;others added the letter to the name, im- itself. plying belonging to, e.g. Rassouly. Sincethen, names One means of examining the degree of biologi- have been regularly transmitted from the male parent cal kinship within a population, or between its sub- to the child. Since birth registration is mandatory, a divisions, is to measure the occurrencesof common child takes the name of the father. Illegitimate chil- surnamesusing Lasker's(1977) isonymy model. The dren are usually not given a name unlessrequired by method of measuringgenetic lineagethrough isonymy either parent. The wife usually takes the name of her is useful in studies where information on kinship husband at marriage. based on pedigreesand genetic markers is not avail- A large part of the Caspian littoral remained iso. able. Surname transmissionresembles genetic inher- 104 Haideh Moxut and Eric SuNoeRl.nNn itance, and ca,n be analysed to indicate the origin of random (attributed to population size and surname genes, and to delineate breeding populations. Sur- distribution), and non-random (special proclivity to names ca.n become extinct, like genes, depending on marry one's own cousin) components of inbreeding. name frequency, family size, and sex ratio (Dobson Lasker (1977) extended the method of isonymy from and Roberts, 1971). intracommunity inbreeding to inter-population rela- Communities with few surnames at high frequen- tionship, to show how it was possible to examine the cies indicate greater localization of genes, a,nd con- relative linkage of two or more populations by sur- "Coeffi- sequently high inbreeding coefficients. Estimates of name analysis. He introduced the concept of rates of inbreeding can be obtained through mar- cient of Relationship" by isonymy, as the proportion riages between persons of the same name. Crow and of individuals with common surnames within or be- Mange (1965) elaborated this idea, and examined the tween populations. Fig. 1 : Map of Iran and the administrative subdivisions of Shahrestan Nowshahr. :v;"$!!,,.,, i-:l-t',;*èù'-' ..-cÏ ! J Nowshalir / -:J'-ù..- t.. n--f'---.r"': AFGHANI S T AN - --1--;'- | R-lÀrrN^ ,1- r )-t r-(. ^('- PAKISTAN SAUDI ARABIA n :A\à" 5 10 15Km Caspian .tl 'o. Sea :g,nurï; ! a a, a ata KACHROSTAGH (t,, a I iil:, ÊI{e$aramte 'Hagsank,"J, ' .t '.,1' d'U/-Kts'N^>t ;?Éar-1eEH-.i >i t t ..'F vJf' , K|:l-tôlrR / u\ t j ? -_j_4î--:7i1. $:fi#*.ti:"4'!*o;;.h,. ru,..A.. .(.-aarj\l* ,'i ^.:;\ . .. ,T.-..*\rrr;ir_ 1. o o tiùr#- __., \) e. ra .*...,1..' io"$^arl H - \ .touo:.:-.': îS KU L' . ,KUHEsrm.t xo.rôun. I $ r\ 1J"-. ,i*r."tsuù 1 \ 7 r' I qr. S e-sxnh rq.. f"iBAKHSH Bakhshboundary . r loenesunDEHESTAN Dehestan boundary - - - Towns Towns 0 Villages. Surnames and gene flow in ShahrestanNowshahr 105 S:rUoY An,EA localizationexists, and to examine any clines in sur- name flow between every pair of dehestans. It was also Shahrestan Nowshahr (fiS. 1) is an adminis- considereduseful to assessthe possibility of ap- plying this technique trative subdivision (3695 sq km) of the Province of to an Iranian population. Mazandaran,situated in the North of lran, between The coefficient of relationship by isonymy is the southern shoresof the Caspian Sea and the Al- mathematically expressedas borz Ranges. Administratively, Iran is divided into ostans, shahrestans,bakhshes, dehestans (conglom- Ri - S;z)/2NtNz eratesof villages)and dehs (villages). The deh is the f{Sn smallest unit of habitation, urswell as the economic where ^9;1and unit of agriculture and consumption; it also consti- .9;2 are the respective frequenciesof the ith surname in the tutes a social unit composedmainly of related indi- males and femalesof the pop- ulation viduals. The great majority of the rural population (or in two populations), and N1 and N2 are the corresponding of the Caspian Littoral residesin these units. These sample sizes. The model is based on two assumptions villages are semi-continuous on the coast, and nucle- : unilineal descentof surname (polyphyletisnr or multiple ated in the highlands. The climate is subtropical in ancestral origin of sur- namescan violate the lowlands, and is one major causeof the summer the assumption),and that the ex- changeof surnames proportional and winter migration of the population. The moun- is to the flow of mi- grants, i.e. equal tainous topography and the abundanceof rivers have virilocal and uxorilocal migration. constituted major obstaclesto movemeut and contact The population under study has a system of pa- betweenthe villages. The construction of roads and trilineally descendingsurnames; furthermore, it has bridges, specifically the Chalous bridge have facili- been assumedthat surnamesare monophyletic. The tated communication between the settlements. The assumption of uniform migration of the sexes has inhabitants are mainly Mazandarani and Gilaki, in been consideredwith caution. In general,patrilocal- addition to the Khajevand and Lak Kurds who were ity appears to be more frequent, and more of the ge- resettled here around 200 years ago from north-west netic exchangeand intermarriagebetween the settle- Iran. Many of the local populations are culturally ments are basedon female migration. However, some homogeneousand retain strong kinship ties. factorsneed to be considered.Primarily, movementis The comparative demographic analysis of the extremely limited becauseof the geographicsetting, three existing censusreturns of ShahrestanNowshahr the communicationnetwork, the agricultural pattern (Mehrai, 1984) has revealedchanges in the composi- of subsistence,and also the proclivity to marry mem- tion of the population, and the trend conforms to bers of the same village. It is erroneousto generalize on pattern the demographicgeneralization of the tansition Pe- the of movement within each dehestan, riod. Differencesin family structure, migration pat- since it is determined by the structure of the distri- terns and population growth betweenthe urban and bution of the villages,the kinship structure,and its rural areas, have rural or urban nature. Another factor is the local cus- been attributed to socio-economic "khaneh-damad" changes,and urbanization in the last 40 years. tom of meaning house-groom;this is a situation when a man movesto a wife's residence at marriage. Touba(1972) statesthat matrilocal res- M.mpnTAL AND METHoDS idence also occurs dependingon the village and the economicstate of the bride's family. A final essential Data presented for this study were collected point is the traditional summer and winter migration through questionnaireforrns, from a total of 1,042 of the people,particularly the males who descendto households. The forms were distributed to schools the lowlandsin the winter in searchof work. and usu- throughout the region, to obtain a geographically ally migrate back to the mountains in the summer.