More Omnivore Dilemmas: Seasonal Diet Changes Can Cause Reproductive Stress in Primates

ScienceDaily (Nov. 28, 2012) — When seasonal changes affect food availability, omnivores like blue monkeys adapt by changing their diets, but such nutritional changes may impact female reproduction, according to research published November 28 in the open access journal PLOS ONE by Steffen Foerster from Barnard College, and colleagues from Columbia University and the Smithsonian Institution.

The authors found that levels of fecal glucocorticoids (fGC), a stress marker, increased when female monkeys shifted their diet towards lower quality fallback foods, whereas the levels decreased when the monkeys had access to preferred foods like insects, fruits and young leaves.

They also found that lactating females and those in the later stages of pregnancy showed greater increases in the stress marker than females who were not in these stages of reproduction. According to the authors, their results suggest that these seasonal changes in food availability may affect inter-birth intervals in these primates, and also affect the timing of infant independence from mothers.

Read on:  http://www.sciencedaily.com/releases/2012/11/121128182947.htm