KLI Colloquia are informal, public talks that are followed by extensive dissussions. Speakers are KLI fellows or visiting researchers who are interested in presenting their work to an interdisciplinary audience and discussing it in a wider research context. We offer three types of talks:

1. Current Research Talks. KLI fellows or visiting researchers present and discuss their most recent research with the KLI fellows and the Vienna scientific community.

2. Future Research Talks. Visiting researchers present and discuss future projects and ideas togehter with the KLI fellows and the Vienna scientific community.

3. Professional Developmental Talks. Experts about research grants and applications at the Austrian and European levels present career opportunities and strategies to late-PhD and post-doctoral researchers.

  • The presentation language is English.
  • If you are interested in presenting your current or future work at the KLI, please contact the Scientific Director or the Executive Manager.

Event Details

Nicole Grunstra
KLI Colloquia
Multiple Approaches to Understanding Human Pelvic Evolution – A Reappraisal of the Obstetrical Dilemma
2021-06-17 15:00 - 2021-06-17 17:00
Organized by KLI
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Topic description/abstract

One of the most widespread and perhaps best-known hypotheses about human evolution is the Obstetrical Dilemma. Coined in 1960, the Obstetrical Dilemma combines several early 20th century ideas to explain why human childbirth is difficult and risky owing to a tight “fetopelvic” fit: There is an evolutionary tradeoff (“dilemma”) in the human pelvis arising from selection that favors a spacious birth canal that can accommodate birth of a big-brained baby, and simultaneously selection favoring a narrower or smaller birth canal as required by bipedal locomotion. As a result, human babies need to be delivered ‘early’ while they still fit through the birth canal and consequently are comparatively helpless for a primate newborn. In recent years, this hypothesis has come under fire and has been rejected by vocal critics on multiple grounds, including the alleged detrimental impact of the hypothesis on modern medical practice. Drawing on recent empirical and theoretical work, I show how the notions of an evolutionary tradeoff and bipedalism constraining pelvic expansion are well supported or at the least have not been successfully dismantled, and that, as a consequence, the Obstetrical Dilemma remains largely a tenable hypothesis.

Biographical note

Nicole Grunstra obtained a PhD in biological anthropology from the University of Cambridge (UK) and her expertise includeshuman evolution and functional, ecological, and evolutionary morphology of primates and other mammals. Central to her work is her passion for comparative morphology and natural history collections, as well as a fascination with macroevolutionary patterns of trait evolution and their relation to microevolutionary processes and developmental constraints.

At the KLI, Dr. Grunstra conducts research on human pelvic evolution and the evolution of difficult human childbirth in both an evolutionary medicine and a phylogenetic comparative framework. Together with her collaborators from the University of Vienna, she recently found support for the “pelvic floor hypothesis” of human pelvic evolution that predicts a trade-off between childbirth and pelvic floor support in the human bony pelvis. Comparative morphological work includes similarities and differences in pelvic sex differences in humans and chimpanzees, and obstetric adaptations in the pelvic morphology of bats (Chiroptera).