The evolutionary demography of sex ratios in rural Bangladesh

Mary Shenk, Mary C. Towner, Kathrine Starkweather, Curtis J. Atkisson, Nurul Alam

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Abstract

In this chapter, we use evolutionary models of sex ratio variation to examine offspring sex ratios in Matlab, Bangladesh, from the 1960s to 2010, during which time sex ratios have shown a decreasing male bias. Evolutionary models lead us to examine particular aspects of family ecology, yielding predictions both unique from and similar to those proposed in the demographic literature. We examine three evolutionary models-the costs of reproduction model, the Trivers-Willard hypothesis, and the local resource competition and enhancement models. Our results support both the Trivers-Willard and local resource competition/enhancement model, but results for the costs of reproduction model are weak. In general, we find that variables associated with higher wealth, status, and engagement in agriculture are linked to more male-biased offspring sex ratios, while higher fertility, older age at marriage, and higher women's education are associated with less male-biased sex ratios. We also examine how Bangladesh fits into the larger cultural area of South Asia known in the press and policy circles for its high sex ratios. We compare the correlates of sex ratio in Matlab to those in other parts of the region and discuss why sex ratios in Bangladesh are less male biased, despite shared cultural characteristics, such as son preference and dowry, which some argue "cause" high sex ratios in parts of India and Pakistan. We conclude with a discussion of the utility of evolutionary models and offer policy recommendations for the region.

Original languageEnglish (US)
Title of host publicationApplied Evolutionary Anthropology
Subtitle of host publicationDarwinian Approaches to Contemporary World Issues
PublisherSpringer New York
Pages141-173
Number of pages33
ISBN (Electronic)9781493902804
ISBN (Print)9781493902798
DOIs
StatePublished - Jan 1 2014

Fingerprint

sex ratio
demography
Bangladesh
South Asia
costs
resources
Pakistan
ecology
fertility
marriage
agriculture
India
cause

All Science Journal Classification (ASJC) codes

  • Social Sciences(all)

Cite this

Shenk, M., Towner, M. C., Starkweather, K., Atkisson, C. J., & Alam, N. (2014). The evolutionary demography of sex ratios in rural Bangladesh. In Applied Evolutionary Anthropology: Darwinian Approaches to Contemporary World Issues (pp. 141-173). Springer New York. https://doi.org/10.1007/978-1-4939-0280-4_7
Shenk, Mary ; Towner, Mary C. ; Starkweather, Kathrine ; Atkisson, Curtis J. ; Alam, Nurul. / The evolutionary demography of sex ratios in rural Bangladesh. Applied Evolutionary Anthropology: Darwinian Approaches to Contemporary World Issues. Springer New York, 2014. pp. 141-173
@inbook{c8fa2c65acd2496f90abd94b61f62061,
title = "The evolutionary demography of sex ratios in rural Bangladesh",
abstract = "In this chapter, we use evolutionary models of sex ratio variation to examine offspring sex ratios in Matlab, Bangladesh, from the 1960s to 2010, during which time sex ratios have shown a decreasing male bias. Evolutionary models lead us to examine particular aspects of family ecology, yielding predictions both unique from and similar to those proposed in the demographic literature. We examine three evolutionary models-the costs of reproduction model, the Trivers-Willard hypothesis, and the local resource competition and enhancement models. Our results support both the Trivers-Willard and local resource competition/enhancement model, but results for the costs of reproduction model are weak. In general, we find that variables associated with higher wealth, status, and engagement in agriculture are linked to more male-biased offspring sex ratios, while higher fertility, older age at marriage, and higher women's education are associated with less male-biased sex ratios. We also examine how Bangladesh fits into the larger cultural area of South Asia known in the press and policy circles for its high sex ratios. We compare the correlates of sex ratio in Matlab to those in other parts of the region and discuss why sex ratios in Bangladesh are less male biased, despite shared cultural characteristics, such as son preference and dowry, which some argue {"}cause{"} high sex ratios in parts of India and Pakistan. We conclude with a discussion of the utility of evolutionary models and offer policy recommendations for the region.",
author = "Mary Shenk and Towner, {Mary C.} and Kathrine Starkweather and Atkisson, {Curtis J.} and Nurul Alam",
year = "2014",
month = "1",
day = "1",
doi = "10.1007/978-1-4939-0280-4_7",
language = "English (US)",
isbn = "9781493902798",
pages = "141--173",
booktitle = "Applied Evolutionary Anthropology",
publisher = "Springer New York",
address = "United States",

}

Shenk, M, Towner, MC, Starkweather, K, Atkisson, CJ & Alam, N 2014, The evolutionary demography of sex ratios in rural Bangladesh. in Applied Evolutionary Anthropology: Darwinian Approaches to Contemporary World Issues. Springer New York, pp. 141-173. https://doi.org/10.1007/978-1-4939-0280-4_7

The evolutionary demography of sex ratios in rural Bangladesh. / Shenk, Mary; Towner, Mary C.; Starkweather, Kathrine; Atkisson, Curtis J.; Alam, Nurul.

Applied Evolutionary Anthropology: Darwinian Approaches to Contemporary World Issues. Springer New York, 2014. p. 141-173.

Research output: Chapter in Book/Report/Conference proceedingChapter

TY - CHAP

T1 - The evolutionary demography of sex ratios in rural Bangladesh

AU - Shenk, Mary

AU - Towner, Mary C.

AU - Starkweather, Kathrine

AU - Atkisson, Curtis J.

AU - Alam, Nurul

PY - 2014/1/1

Y1 - 2014/1/1

N2 - In this chapter, we use evolutionary models of sex ratio variation to examine offspring sex ratios in Matlab, Bangladesh, from the 1960s to 2010, during which time sex ratios have shown a decreasing male bias. Evolutionary models lead us to examine particular aspects of family ecology, yielding predictions both unique from and similar to those proposed in the demographic literature. We examine three evolutionary models-the costs of reproduction model, the Trivers-Willard hypothesis, and the local resource competition and enhancement models. Our results support both the Trivers-Willard and local resource competition/enhancement model, but results for the costs of reproduction model are weak. In general, we find that variables associated with higher wealth, status, and engagement in agriculture are linked to more male-biased offspring sex ratios, while higher fertility, older age at marriage, and higher women's education are associated with less male-biased sex ratios. We also examine how Bangladesh fits into the larger cultural area of South Asia known in the press and policy circles for its high sex ratios. We compare the correlates of sex ratio in Matlab to those in other parts of the region and discuss why sex ratios in Bangladesh are less male biased, despite shared cultural characteristics, such as son preference and dowry, which some argue "cause" high sex ratios in parts of India and Pakistan. We conclude with a discussion of the utility of evolutionary models and offer policy recommendations for the region.

AB - In this chapter, we use evolutionary models of sex ratio variation to examine offspring sex ratios in Matlab, Bangladesh, from the 1960s to 2010, during which time sex ratios have shown a decreasing male bias. Evolutionary models lead us to examine particular aspects of family ecology, yielding predictions both unique from and similar to those proposed in the demographic literature. We examine three evolutionary models-the costs of reproduction model, the Trivers-Willard hypothesis, and the local resource competition and enhancement models. Our results support both the Trivers-Willard and local resource competition/enhancement model, but results for the costs of reproduction model are weak. In general, we find that variables associated with higher wealth, status, and engagement in agriculture are linked to more male-biased offspring sex ratios, while higher fertility, older age at marriage, and higher women's education are associated with less male-biased sex ratios. We also examine how Bangladesh fits into the larger cultural area of South Asia known in the press and policy circles for its high sex ratios. We compare the correlates of sex ratio in Matlab to those in other parts of the region and discuss why sex ratios in Bangladesh are less male biased, despite shared cultural characteristics, such as son preference and dowry, which some argue "cause" high sex ratios in parts of India and Pakistan. We conclude with a discussion of the utility of evolutionary models and offer policy recommendations for the region.

UR - http://www.scopus.com/inward/record.url?scp=84987717263&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84987717263&partnerID=8YFLogxK

U2 - 10.1007/978-1-4939-0280-4_7

DO - 10.1007/978-1-4939-0280-4_7

M3 - Chapter

AN - SCOPUS:84987717263

SN - 9781493902798

SP - 141

EP - 173

BT - Applied Evolutionary Anthropology

PB - Springer New York

ER -

Shenk M, Towner MC, Starkweather K, Atkisson CJ, Alam N. The evolutionary demography of sex ratios in rural Bangladesh. In Applied Evolutionary Anthropology: Darwinian Approaches to Contemporary World Issues. Springer New York. 2014. p. 141-173 https://doi.org/10.1007/978-1-4939-0280-4_7