The ecology and life history The ecology and life history of the common frog (Rana temporaria temporaria) ecologylifehisto00sava Year: 1962 EXTERNAL FACTORS ON THL SPAWN DATE 129 were lower than any suicc the beginning of February. The 13 th to 17th March 1929 also saw the spawning quite uninterrupted by the cold spell. The middle of the 1927 season was marked by a slowly falling temperature with no apparent effect on the course of spawning. Turning now to Figs. 33 and 34, we have confu-mation trom two other areas. Probably because of the presence of meteorological staff in the town or villag
The ecology and life history The ecology and life history of the common frog (Rana temporaria temporaria) ecologylifehisto00sava Year: 1962 EXTERNAL FACTORS ON THL SPAWN DATE 129 were lower than any suicc the beginning of February. The 13 th to 17th March 1929 also saw the spawning quite uninterrupted by the cold spell. The middle of the 1927 season was marked by a slowly falling temperature with no apparent effect on the course of spawning. Turning now to Figs. 33 and 34, we have confu-mation trom two other areas. Probably because of the presence of meteorological staff in the town or village, observers joined the scheme in two places where there RAIN z c mm 55 25 24 < prn a 1931 FEB 6 II 16 21 26 3 8 13 18 23 28 2 7 YEAR-DAY 42 47 52 57 62 67 72 77 82 87 92 97 Fig. 32. The Chart for 1931 A normal year for rainfall, but interesting because of the very'cold weather early in March. Some spawning took place in this bitter weather, but there was perhaps an accumulation of reports in the exceptionally warm weather that followed. The temperatures are,' of course, shade temperatures. A temperature of 19° on the 21st March suggests that some spawn in the sun was near a dangerous temperature. were ist Order Observatories, Eskdalemuir, a small village liigh in the hills of southern Scotland, and Valentia in the south-west of Ireland. Fig. 33 shows the weather of the week before spawning in three years at Eskdalemuir {a), {h) and {c), and one at Valentia, {d), and Fig. 34 shows the weather at every hour of the day and night at Eskdalemuir in two contrasting years. It is impossible, after looking at these dia- grams, to beheve in any marked connexion between the temperature on the night of spawning and the event itself, for the temperatures
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