A Yale doctoral researcher has uncovered a surprising evolutionary paradox in woodland salamanders. Despite appearing unchanged for millions of years, these amphibians have experienced rapid physiological evolution beneath the surface.
Nathalie Alomar, a doctoral candidate at Yale, focused her dissertation on these creatures, which seemed to have escaped the typical forces of evolution. Her work challenges the notion that visible stability implies genetic or functional stasis.
The study found that internal systems—such as metabolism, respiration, or other physiological traits—have evolved at a much faster pace than the salamanders' outward morphology. This decoupling suggests that evolutionary pressures can act selectively on different biological layers.
These findings could reshape how scientists understand evolutionary rates and the relationship between form and function. The research highlights that organisms may harbor hidden adaptive changes even when their bodies look the same across deep time.
Alomar's work underscores a key lesson: evolution is not always visible to the naked eye. It adds a nuanced perspective to the debate over whether morphology or physiology better reflects evolutionary history.