Sophia Zaslow, a doctoral student in biological sciences at Binghamton University, has found that body coloration in eastern red-backed salamanders correlates with their sprint speed. Her research, published in the Canadian Journal of Zoology, builds on undergraduate work examining how intra-morph color variation relates to physiological performance in the species.
Zaslow conducted repeated sprint trials on the common salamanders to measure their running velocity and assess overall fitness. The eastern red-backed salamander exists in two main color morphs, but individuals within the same morph display variation in coloration intensity. Her work examined whether these subtle color differences predict athletic capability.
The findings suggest that salamander color patterns may serve as honest signals of physical condition. Darker or brighter individuals within a morph could possess superior neuromuscular function or metabolic efficiency, advantages that manifest in faster sprint times. This relationship between pigmentation and performance has implications for understanding how salamanders navigate predation and competition in their natural habitats.
The research adds to a growing body of work examining the connection between phenotypic traits and functional performance in amphibians. Eastern red-backed salamanders inhabit forest floors across eastern North America, where acceleration and sustained speed matter for capturing prey and escaping threats. If color genuinely reflects sprint capability, it becomes a visual cue that rivals or predators can assess.
Zaslow's systematic approach using controlled sprint trials provides quantitative data on this relationship. The work represents early-stage exploration into physiological trade-offs in salamanders. Future research might investigate whether color-performance links reflect genetic differences, developmental factors, or environmental influences on pigmentation and metabolism.