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Marriage in the Melting Pot: An evolutionary approach to European ancestry, homogamy and fertility in the United States
bioRxiv - Evolutionary Biology Pub Date : 2020-05-27 , DOI: 10.1101/2020.05.25.114108
Alexander Schahbasi , Susanne Huber , Martin Fieder

Objective: To understand marriage patterns, homogamy and fertility of women of European ancestry in the United States from an evolutionary perspective we aim to investigate if a prevalence for ancestral homogamy exists, the factors influencing a female preference for an ancestral homogamous vs. an heterogamous marriage, if an ancestral homogamous vs. heterogamous marriages influences fertility and if there is an inherted component of the tendency to marry homogamously vs. heterogamously. Furthermore we aim to determine the heritability of homogamous vs. heterogamous marriage behaviour. Methods: We used the census data of 369,121 US women married only once and aged between 46 and 60 years, provided by IPUMS USA (https://usa.ipums.org/usa/). We used linear mixed models to determine associations of the probability of a homogamous vs. heterogamous marriage and the individual fertility of a women. We aimed to estimate the heritability (in our case genetic & parental environment) of marriage behaviour using a linear mixed model. Results: We found, that ancestral heterogamous marriages are more frequent (56.5%), compared to homogamous marriages (43.5%). Most of the variance in inter- ancestry marriage and fertility is explained by ancestry per se, followed by the ratio of individuals of a certain ancestral background in a county: the more individuals of a certain ancestry live in a county the lower is the tendency to marry someone of a different ancestral background. Furthermore we found that about 11.8% of the marriage behaviour is heritable. Being in a homogamous marriage as well as the income of the spouse are both significantly positively associated with the number of children a women has and the probability that a women has at least one child. Discussion: The most important explaining factor (in terms of variance explained) for being in an ancestral homogamous vs. heterogamous marriage, for number of children, as well as childlessness is the ancestry of the women. Albeit we are not able to distinguish the genetic and social heritability on basis of our data, with a total value of 11.8% variance explained, only a small heritability for in-group vs, out-group marriage behaviour is indicated.

中文翻译:

熔炉中的婚姻:美国的欧洲血统,同性恋和生育的进化方法

目的:从进化的角度了解美国欧洲血统女性的婚姻模式,同性婚姻和生育力,我们旨在调查是否存在祖先同性婚姻的流行,影响女性偏爱祖先同性婚姻和异性配偶婚姻的因素,如果祖先的一夫一妻制与一夫一妻制的婚姻会影响生育力,并且一夫一妻制与一夫一妻制的婚姻倾向中存在固有的部分。此外,我们旨在确定一夫一妻制与一夫一妻制婚姻行为的遗传性。方法:我们使用了IPUMS USA(https://usa.ipums.org/usa/)提供的369121名美国妇女的普查数据,该妇女仅结过一次婚,年龄在46至60岁之间。我们使用线性混合模型来确定一夫一妻制与一夫一妻制的概率之间的关联。异性婚姻和妇女的个人生育能力。我们旨在使用线性混合模型来估计婚姻行为的遗传力(在我们的案例中是遗传和父母环境)。结果:我们发现,与同性婚姻(43.5%)相比,祖先异性婚姻更为频繁(56.5%)。宗族婚姻和生育率的大部分差异是由宗族本身解释的,其次是郡中具有一定祖先背景的人所占的比例:某宗祖先在一个县中居住的人越多,则该族的倾向就越低。与祖先背景不同的人结婚。此外,我们发现大约11.8%的婚姻行为是可遗传的。同性婚姻以及配偶的收入都与妇女所生子女的数量以及妇女至少生一个子女的可能性显着正相关。讨论:对于祖先的一夫一妻制和异性一夫一妻制的婚姻,就子女数量以及无子女而言,最重要的解释因素是妇女的血统。尽管我们无法根据我们的数据来区分遗传和社会遗传力,但解释的总价值为11.8%,仅表明了群体内婚姻行为与群体外婚姻行为的遗传力较小。对于许多孩子来说,异性婚姻以及无子女是妇女的祖先。尽管我们无法根据我们的数据来区分遗传和社会遗传力,但解释的总价值为11.8%,仅表明了群体内婚姻行为与群体外婚姻行为的遗传力较小。对于许多孩子来说,异性婚姻以及无子女是妇女的祖先。尽管我们无法根据我们的数据来区分遗传和社会遗传力,但解释的总价值为11.8%,仅表明了群体内婚姻行为与群体外婚姻行为的遗传力较小。
更新日期:2020-05-27
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