Water temperature at which Columbia spotted frog (Rana luteiventris) eggs were deposited and developed was determined at 18 oviposition sites in northeastern Oregon in 2000. Mean daily water temperature on the day of initial egg deposition ranged from 7.6 °C to 16.0 °C with a mean of 9.6 °C. Maximum water temperatures on the 1st day of egg deposition ranged from 9.8 °C to 20.2 °C and averaged 15.5 °C. Eggs were not deposited on days when maximum water temperature was below 9.4 °C. Duration of egg deposition ranged from 1 to 20 days at the 18 sites. Embryos hatched after 12–21 days. Mean and maximum daily water temperatures were significantly correlated with number of days to hatching.
Bull, Evelyn L. and Shepherd, Jay F.
"Water temperature at oviposition sites of Rana luteiventris in northeastern Oregon,"
Western North American Naturalist: Vol. 63
, Article 14.
Available at: http://scholarsarchive.byu.edu/wnan/vol63/iss1/14