The ecology and life history The ecology and life history of the common frog (Rana temporaria temporaria) ecologylifehisto00sava Year: 1962 EXTERNAL FACTORS ON THE SPAWN DATE 143 Let Y = Spawn date in year days, AP = Altitude of Phenological station in feet, AM = Altitude of Meteorological station in feet, RMo = Rainfall in Mo in nun, TMo = Temperature in Mo in °C, RMi = Rainfall in Mi, in mm, TMi =-â Temperature in Mi, in °C, SMi = Bright simsliine in Mi, in , RM2 = Rainfall in M2, in 40 50 6O OBSERVED DATE 70 80 90 Fig. 40, An Informal Test of the Regression Equation Ten records were ta
The ecology and life history The ecology and life history of the common frog (Rana temporaria temporaria) ecologylifehisto00sava Year: 1962 EXTERNAL FACTORS ON THE SPAWN DATE 143 Let Y = Spawn date in year days, AP = Altitude of Phenological station in feet, AM = Altitude of Meteorological station in feet, RMo = Rainfall in Mo in nun, TMo = Temperature in Mo in °C, RMi = Rainfall in Mi, in mm, TMi =-â Temperature in Mi, in °C, SMi = Bright simsliine in Mi, in , RM2 = Rainfall in M2, in 40 50 6O OBSERVED DATE 70 80 90 Fig. 40, An Informal Test of the Regression Equation Ten records were taken at random, and the corresponding variables substituted in the equation to give a calculated date. This has been plotted against the actual date. The agreement is good, only one point being far wrong. mm, TM2 = Temperature in M2, in °C, LT = 'Latitude, LG = 'Longitude. Thenâ Y = 57-5 + (0-003 5) AP â (0-0031) AM + (o-02)RMo + (o-9i)TMo â (o-0707)RMi + (o-i7)TMi + (o-03o)SMi + (o-oo9)RM2 + (3-io)LT-(3-4)LG Fig. 40 is an informal illustration of the way in which it fits the facts. Ten dates were chosen at random and the values substituted in the equation, so as to obtain a date by calculation. The actual dates were then plotted against the calculated dates. It can be seen that only one date is much out of line. In the other cases, if the pond had been visited on the calculated date frogs might have been there, just departed or
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