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Report on the phenological observations in the British isles from December 1932 to November 1933. No. 43.
Author(s) -
Clark J. Edmund,
Margary Ivan D.,
Cave C. J. P.
Publication year - 1935
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49706125803
Subject(s) - danaus , phenology , geography , spring (device) , demography , climatology , biology , ecology , lepidoptera genitalia , geology , mechanical engineering , sociology , engineering
1933 was warm, dry and sunny to an exceptional degree. Warmth was +2°F., rain 87 per cent, and sunshine 109 per cent for the 12‐month period December to November. This was due chiefly to conditions in the summer, and therefore phenologically most effective, half year. Scotland, N. and E., and England, NE., were strikingly favoured. The difference in flowering period between England, S., and Scotland, N., was reduced from 20 to 10 days. The relative spacing of spring migrant isophenes tallied. Owing to the cold snap in the south at the end of April, they were decidedly close there, but broadened in the north, curiously giving a “normal” year for all districts. The most striking insect phenomenon was the excessive invasion of migrant butterflies. Noteworthy was the record of 30 of the huge American “Milkweed” butterfly, Danaus plexippus , treble any previous record.