Conserved phenotypic variation patterns, evolution along lines of least resistance, and departure due to selection in fossil rodents.

Abstract excerpt

Within a group of organisms, some morphologies are more readily generated than others due to internal developmental constraints. Such constraints can channel evolutionary changes into directions corresponding to the greatest intraspecific variation. Long-term evolutionary outputs, however, depend on the stability of these intraspecific patterns of variation over time and from the interplay between internal...

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