Social and ecological drivers of reproductive seasonality in geladas

Behavioral Ecology : Official Journal of the International Society for Behavioral Ecology
Elizabeth Tinsley JohnsonJacinta C Beehner

Abstract

Many nonseasonally breeding mammals demonstrate some degree of synchrony in births, which is generally associated with ecological factors that mediate fecundity. However, disruptive social events, such as alpha male replacements, also have the potential to affect the timing of female reproduction. Here, we examined reproductive seasonality in a wild population of geladas (Theropithecus gelada) living at high altitudes in an afro-alpine ecosystem in Ethiopia. Using 9 years of demographic data (2006-2014), we determined that, while females gave birth year-round, a seasonal peak in births coincided with peak green grass availability (their staple food source). This post-rainy season "ecological peak" in births meant that estimated conceptions for these births occurred when temperatures were at their highest and mean female fecal glucocorticoid concentrations were at their lowest. In addition to this ecological birth peak, we also found a separate birth peak that occurred only for females in groups that had experienced a recent replacement of the dominant male (i.e., a takeover). Because new dominant males cause abortions in pregnant females and kill the infants of lactating females, takeovers effectively "reset" the reproductive c...Continue Reading

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Citations

Sep 24, 2020·Biological Reviews of the Cambridge Philosophical Society·Sandra A HeldstabIkki Matsuda
Nov 7, 2020·Current Biology : CB·Amy LuJacinta C Beehner
Sep 15, 2020·Molecular and Cellular Endocrinology·Guillaume Martinez, Cécile Garcia
Jun 3, 2021·Proceedings. Biological Sciences·Elizabeth Tinsley JohnsonJacinta C Beehner

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