The effect of climate fluctuation on chimpanzee birth sex ratio.

PloS One
Hjalmar S KühlTobias Deschner

Abstract

Climate and weather conditions, such as the North Atlantic Oscillation, precipitation and temperature influence the birth sex ratio (BSR) of various higher latitude species, including deer, elephant seals or northern human populations. Although, tropical regions show only little variation in temperature, climate and weather conditions can fluctuate with consequences for phenology and food resource availability. Here, we evaluate, whether the BSR of chimpanzees, inhabiting African tropical forests, is affected by climate fluctuations as well. Additionally, we evaluate, if variation in consumption of a key food resource with high nutritional value, Coula edulis nuts, is linked to both climate fluctuations and variation in BSR. We use long-term data from two study groups located in Taï National Park, Côte d'Ivoire to assess the influence of local weather conditions and the global climate driver El Niño Southern Oscillation (ENSO) on offspring sex. Côte d'Ivoire has experienced considerable climate variation over the last decades, with increasing temperature and declining precipitation. For both groups we find very similar time windows around the month of conception, in which offspring sex is well predicted by ENSO, with more males...Continue Reading

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Citations

Mar 9, 2019·Science·Hjalmar S KühlAmmie K Kalan
Nov 23, 2018·Animals : an Open Access Journal From MDPI·Francisco Javier Navas GonzálezJuan Vicente Delgado Bermejo
Dec 18, 2020·Evolutionary Anthropology·Andrew B Bernard, Andrew J Marshall

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