期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 16, 期 4, 页码 708-720出版社
WILEY-BLACKWELL
DOI: 10.1046/j.1420-9101.2003.00568.x
关键词
developmental rate; Mus; ontogenetic trajectory; ontogeny; precociality; Sigmodon; skull shape
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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