Placental invasiveness and brain-body allometry in eutherian mammals

M. G. Elliot*, B. J. Crespi

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

29 Citaten (Scopus)


Brain growth is a key trait in the evolution of mammalian life history. Brain development should be mediated by placentation, which determines patterns of resource transfer from mothers to fetal offspring. Eutherian placentation varies in the extent to which a maternal barrier separates fetal tissues from maternal blood. We demonstrate here that more invasive forms of placentation are associated with substantially steeper brain-body allometry, faster prenatal brain growth and slower prenatal body growth. On the basis of the physiological literature we suggest a simple mechanism for these differences: in species with invasive placentation, where the placenta is bathed directly in maternal blood, fatty acids essential for brain development can be readily extracted by the fetus, but in species with less invasive placentation they must be synthesized by the fetus. Hence, with regard to brain-body allometry and prenatal growth patterns, eutherian mammals are structured into distinct groups differing in placental invasiveness.

Originele taal-2English
Pagina's (van-tot)1763-1778
Aantal pagina's16
TijdschriftJournal of Evolutionary Biology
Nummer van het tijdschrift6
StatusPublished - nov-2008
Extern gepubliceerdJa

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