Changes in seasonality of births in Poland in the years 1900–2009

Cypryjański, Jacek

doi:10.4054/demres.2019.40.49

Cited by 13 publications

(16 citation statements)

References 22 publications

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“…Other studies have shown changes in the magnitude [ 69 , 79 ] or the shape of the birth pattern over time [ 11 ]. Our study also shows such a change: a decrease/increase in precipitation/temperature within the last 30 years parallel to a shift in the timing of the second peak of births in the year.…”

Section: Discussionmentioning

confidence: 99%

“…This is a classic issue in demography [e.g. 10 , 11 ], whose significance has been demonstrated in the vast majority of populations from the broad national scale [e.g. 12 ] to the local scale [ 13 ], but with considerable differences in pattern, magnitude and timing [e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Even though reproductive seasonality is a classic topic of investigation in anthropological and historical demography [e.g. 6 , 11 , 26 , 30 ], only few studies have investigated the presence and causes of reproductive seasonality in hunter-gatherer societies [ 13 , 36 , 37 ]. These societies depend on a very close relationship with the environment for their culture and livelihood (including food resources and medicine), and can thus be expected to be more directly influenced by climatic variables (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Because temperatures are increasing worldwide and rainfall patterns are changing in different parts of the planet due to climate change, we expect to see variations in both variables over the last 30 years, with an effect on reproductive seasonality [e.g. 11 , 27 , 69 ]. This study is based on 13 years of systematic and regular fieldwork and on 34 years of birth records, the largest number of such records ever obtained (n = 1803) for a hunter-gatherer population ([ 13 ] n = 147, [ 36 ] n = 221).…”

Section: Introductionmentioning

confidence: 99%

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Reproductive seasonality in the Baka Pygmies, environmental factors and climatic changes

et al. 2022

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Reproductive seasonality is a phenomenon common to human and animal populations and driven by, among others, climatic variables. Given the currently changing climate and its impacts on both the environment and human lives, the question arises of its potential effects on reproductive seasonality. Few studies have specifically explored the seasonality of reproduction among hunter-gatherers and anyone investigated how current climate change might affect this phenomenon. In this study we addressed reproductive seasonality in the Baka Pygmy living in African rain forests. Since reproductive seasonality can be linked to weather patterns, we explore this possibility. However, climatic variables driving weather patterns have changed over the years, so we assessed whether this has influenced the Baka reproductive pattern. Based on 34 years of written birth records and oral questionnaires from 13 years of systematic fieldwork, we observed a bimodal birth pattern with two birth peaks at 6-month intervals. Our results demonstrate that precipitation at conception or at birth potentially has effects, respectively negative and positive on the monthly number of births; and temperature has a role in controlling other variables that do affect the reproductive pattern. Changing weather patterns appear to be affecting the reproductive seasonality in the Baka, suggesting that attention needs to be given to the influence of global climate change on forager societies.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reproductive seasonality in the Baka Pygmies, environmental factors and climatic changes

et al. 2022

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“…Notable differences in patterns have been observed for marital and nonmarital fertility (e.g., Régnier-Loilier and Divinagracia 2010), for births of different parities (e.g., Haandrikman 2004), for populations of different faiths (e.g., Friger, Shoham-Vardi, and Abu-Saad 2009), by mother's education level (e.g., Bobak and Gjonca 2001), and by mother's age (e.g., Dahlberg and Andersson 2018). Several studies have also demonstrated marked changes in the seasonality patterns over time (e.g., Cypryjański 2019;Compton and Tedds 2016), sometimes accompanied by a long-run reduction in the amplitude of seasonality (e.g., Régnier-Loilier and Divinagracia 2010;Cancho-Candela, Andrés-de Llano, and Ardura-Fernández 2007).…”

Section: Introductionmentioning

confidence: 99%

The geographical patterns of birth seasonality in Australia

Wilson¹,

McDonald²,

Temple³

2020

DemRes

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BACKGROUNDStudies have shown how births exhibit seasonal patterns, with peaks and troughs in particular months and seasons. Most of this literature focuses on national-level patterns mainly in countries of the northern hemisphere. OBJECTIVEThe aim of the paper is to describe key features of contemporary birth seasonality at a subnational scale across Australia. METHODSData on births across the year by region for the 2001-2016 period were acquired from the Australian Bureau of Statistics. A Births Index was calculated to standardise for length of month and variations in birth numbers between regions. Choropleth maps and graphs were used to illustrate the geographical patterns. RESULTSBirth seasonality across Australia's regions is moderate but the patterns vary in a strongly clustered way. In northern and central latitudes of Australia, births are aboveaverage early in the year (February to April), while in the southeast of the country they tend to be above-average in September and October. CONCLUSIONSThe Australian results are consistent with physiological hypotheses that climate and environmental influences have a role in the seasonality of births. Hot and humid summers in northern Australia, and cold winters in the southernmost parts of the country, might be responsible for reducing the number of conceptions below their regional averages for the year.

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Altered circadian clock gene expression in the sperm of infertile men with asthenozoospermia

Zhang

Gao

et al. 2022

J Assist Reprod Genet

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Changes in seasonality of births in Poland in the years 1900–2009

Cited by 13 publications

References 22 publications

Reproductive seasonality in the Baka Pygmies, environmental factors and climatic changes

Reproductive seasonality in the Baka Pygmies, environmental factors and climatic changes

The geographical patterns of birth seasonality in Australia

Altered circadian clock gene expression in the sperm of infertile men with asthenozoospermia

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