Temperature-related birth sex ratio bias in historical Sami: warm years bring more sons
The birth sex ratio of vertebrates with chromosomal sex determination has been shown to respond to environmental variability, such as temperature. However, in humans the few previous studies on environmental temperature and birth sex ratios have produced mixed results. We examined whether reconstruc...
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Online Access: | http://dx.doi.org/10.1098/rsbl.2007.0482 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2007.0482 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2007.0482 |
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crroyalsociety:10.1098/rsbl.2007.0482 2024-06-23T07:55:31+00:00 Temperature-related birth sex ratio bias in historical Sami: warm years bring more sons Helle, Samuli Helama, Samuli Jokela, Jukka 2007 http://dx.doi.org/10.1098/rsbl.2007.0482 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2007.0482 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2007.0482 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Biology Letters volume 4, issue 1, page 60-62 ISSN 1744-9561 1744-957X journal-article 2007 crroyalsociety https://doi.org/10.1098/rsbl.2007.0482 2024-06-04T06:23:09Z The birth sex ratio of vertebrates with chromosomal sex determination has been shown to respond to environmental variability, such as temperature. However, in humans the few previous studies on environmental temperature and birth sex ratios have produced mixed results. We examined whether reconstructed annual mean temperatures were associated with annual offspring sex ratio at birth in the eighteenth to nineteenth century Sami from northern Finland. We found that warm years correlated with a male-biased sex ratio, whereas a warm previous year skewed sex ratio towards females. The net effect of one degree Celsius increase in mean temperature during these 2 years corresponded to approximately 1% more sons born annually. Although the physiological and ecological mechanisms mediating these effects and their evolutionary consequences on parental fitness remain unknown, our results show that environmental temperature may affect human birth sex ratio. Article in Journal/Newspaper Northern Finland sami The Royal Society Biology Letters 4 1 60 62 |
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The Royal Society |
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crroyalsociety |
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English |
description |
The birth sex ratio of vertebrates with chromosomal sex determination has been shown to respond to environmental variability, such as temperature. However, in humans the few previous studies on environmental temperature and birth sex ratios have produced mixed results. We examined whether reconstructed annual mean temperatures were associated with annual offspring sex ratio at birth in the eighteenth to nineteenth century Sami from northern Finland. We found that warm years correlated with a male-biased sex ratio, whereas a warm previous year skewed sex ratio towards females. The net effect of one degree Celsius increase in mean temperature during these 2 years corresponded to approximately 1% more sons born annually. Although the physiological and ecological mechanisms mediating these effects and their evolutionary consequences on parental fitness remain unknown, our results show that environmental temperature may affect human birth sex ratio. |
format |
Article in Journal/Newspaper |
author |
Helle, Samuli Helama, Samuli Jokela, Jukka |
spellingShingle |
Helle, Samuli Helama, Samuli Jokela, Jukka Temperature-related birth sex ratio bias in historical Sami: warm years bring more sons |
author_facet |
Helle, Samuli Helama, Samuli Jokela, Jukka |
author_sort |
Helle, Samuli |
title |
Temperature-related birth sex ratio bias in historical Sami: warm years bring more sons |
title_short |
Temperature-related birth sex ratio bias in historical Sami: warm years bring more sons |
title_full |
Temperature-related birth sex ratio bias in historical Sami: warm years bring more sons |
title_fullStr |
Temperature-related birth sex ratio bias in historical Sami: warm years bring more sons |
title_full_unstemmed |
Temperature-related birth sex ratio bias in historical Sami: warm years bring more sons |
title_sort |
temperature-related birth sex ratio bias in historical sami: warm years bring more sons |
publisher |
The Royal Society |
publishDate |
2007 |
url |
http://dx.doi.org/10.1098/rsbl.2007.0482 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2007.0482 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2007.0482 |
genre |
Northern Finland sami |
genre_facet |
Northern Finland sami |
op_source |
Biology Letters volume 4, issue 1, page 60-62 ISSN 1744-9561 1744-957X |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rsbl.2007.0482 |
container_title |
Biology Letters |
container_volume |
4 |
container_issue |
1 |
container_start_page |
60 |
op_container_end_page |
62 |
_version_ |
1802648139411226624 |