Secondary sex ratio variation during stressful times: The impact of the French Revolutionary Wars of a German Parish (1787-1802)

Article Abstract:

The birth record from four German village genealogies is analyzed to study the impact of the French Revolutionary Wars (1787-1802) on the proportion of male births. The study has found evidence of a parental sex ratio manipulation strategy meant to offset the female-biased secondary sex ratio (SSR) after the wars and it is shown that from an evolutionary perspective both the decline in SSR in response to stress as well as parental manipulation of the tertiary sex ratio convey reproductive advantages.

Germany, Science & research, Research, Risk factors, Stress (Physiology), Sex ratio, French Revolutionary Wars, 1792-1799

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Variation and causal factors of craniofacial robusticity in Patagonian hunter-gatherers from the late Holocene

Article Abstract:

Geometric morphometric techniques are used to assess within and among-sample cranial robusticity of seven samples from continental Patagonia and Tierra del Fuego. The analysis has show that endocrine changes related to cold climate might be a proper explanation for several craniofacial features found in Fueguian and south continental Patagonian samples, such as their larger masticatory component, and pronounced supraorbital ridge and glabellar region.

South America, Causes of, Hunters, Patagonia, Cranial manipulation

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Comparison of five-site skinfold thicknesses in late pregnancy vs early postpartum

Article Abstract:

Changes in body weight are easily assessed, but changes in fat mass require assumptions and sophisticated equipment. The changes in skinfold thickness that occur in healthy women during pregnancy were recorded between -19 mm to +63 mm. However, skinfold thickness obtained in late pregnancy ranged between 34.1 and 166.8 mm. After comparing these values with those obtained postpartum, there was good correlation between the two.

Measurement, Physiological aspects, Pregnant women, Skinfold thickness

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