How does water temperature affect amphibian egg development?

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banded fire salamander (Salamandra terrestris) — amphibian Banded fire salamander (*Salamandra terrestris*).

Water temperature is a critical factor influencing the rate of embryonic development in amphibians. Generally, warmer water accelerates the process, while colder environments significantly delay it.1

For many anuran species, eggs deposited in warm water may complete development and hatch in as little as one or two days. In contrast, eggs laid in cold environments, such as mountain lakes or streams, may require 30 to 40 days to hatch. The development of salamander eggs typically follows a slower timeline, with hatching occurring anywhere from 20 to 270 days following fertilization, depending on environmental conditions.1