Do precocial mammals develop at a faster rate? A comparison of rates of skull development in Sigmodon fulviventer and Mus musculus domesticus

Journal of Evolutionary Biology - Tập 16 Số 4 - Trang 708-720 - 2003
Miriam Leah Zelditch1, Barbara L. Lundrigan2, H. David Sheets3, Theodore Garland4
1Museum of Paleontology, University of Michigan, Ann Arbor, MI, USA
2Michigan State University Museum and Department of Zoology, Michigan State University, East Lansing, MI, USA
3Department of Physics, Canisius College, Buffalo, NY, USA
4Department of Biology, University of California, Riverside, CA, USA

Tóm tắt

Abstract Variation in neonatal maturity among mammals is often explained by variation in gestation length, but species may also differ in developmental rate, a quantity that is difficult to measure because the conventional formalism makes two important and potentially unrealistic assumptions: (1) ontogeny of form can be described by a single line, and (2) species have the same ontogeny of form. We examine two species, one precocial (Sigmodon fulviventer), the other altricial (Mus musculus domesticus), and find that neither assumption is met. Therefore, we introduce an alternative metric, the rate of shape differentiation away from the average neonate. We find that S. fulviventer has a lower developmental rate than M. m. domesticus; consequently, while more mature at birth, S. fulviventer loses ground to M. m. domesticus over time. Surprisingly, despite differences in gestation length and developmental rate, these species reach developmental and life-history milestones at nearly identical degrees of skull shape maturity.

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