What was the selective pressure for these salamanders?

The selective pressure for salamanders often involves environmental factors such as predation, habitat availability, and climate. These pressures can drive adaptations in behavior, coloration, and physiology, allowing them to better evade predators, thrive in specific habitats, or cope with temperature fluctuations. Additionally, competition for resources and reproductive success can further shape their evolutionary traits. Overall, these pressures can lead to increased survival and reproductive advantages in their specific ecosystems.