Effects of controlled water temperatures on oviposition in a lotic-breeding and externally fertilizing salamander (Hynobius kimurae)

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Why is it important?

In riverine ectotherms, within-year timing of breeding is more advanced when water temperatures increase earlier than usual and is more delayed when water temperatures increase later than usual. However, oviposition in a stream-breeding hynobiid salamander is more delayed with earlier exposure to high temperatures during spring. Oviposition is earlier with experiencing higher temperatures during hibernation. Days from submergence to oviposition are sensitive to cumulative temperatures. A rate in increase in days staying in the water is constant within a population. These results suggest that a biological clock exits for days from submergence to oviposition, which could allow survival in situations with either warmer or cooler environments.